Technical Field
[0001]
The present invention relates to a joint structure of a reinforced concrete column
and a steel beam and a method of joining a reinforced concrete column and a steel beam.
10 Priority is claimed on Japanese Patent Application No. 2015-019331, filed on
February 3, 2015, Japanese Patent Application No. 2015-019332, filed on February 3,
2015, and Japanese Patent Application No. 2015-237704, filed on December 4, 2015, the
contents of which are incorporated herein by reference.
15 Background Art
[0002]
Generally, in a composite structure which configures a main frame by an RC
column (reinforced concrete column) and a steel beam, it is necessary to cause a shear
reinforcement to penetrate the steel beam at a joint of the RC column and the steel beam.
20 However, a work for allowing the shear reinforcement to penetrate the steel beam at the
work site requires lots of time and labor.
[0003]
Accordingly, in many cases, the entire joint including the shear reinforcement or
a member such as a closing plate equivalent to the shear reinforcement is assembled and
25 processed in advance in a factory, is carried to the work site, and is suspended and
2
transported to be installed. A clip construction method is often adopted for arrangement
of shear reinforcements (for example, refer to Patent Document 1, Patent Document 2,
and Patent Document 3).
[0004]
5 Meanwhile, when a composite structure building configured of an RC column
and a steel beam is designed, the design is carried out such that a column-beam joint is
assumed as either a rigid joint or a pin joint (for example, refer to Patent Document 1,
Patent Document 4, Patent Document 5, and Patent Document 6).
[0005]
10 In addition, as shown in FIGS. 26 to 28, if a case where an equally distributed
load acts on a steel beam is considered, a bending moment generated in the steel beam is
changed by a fixed state of a column-beam joint.
That is, in a case where the joints of both ends of the steel beam are rigid joints,
as shown in FIG. 27, a bending moment generated in the steel beam becomes the
15 maximum at the end portion of the steel beam, and a moment MA of the end portion of
the beam and a moment MC of a span center are obtained by the following Expression (1)
and Expression (2). Mmax indicates the maximum moment (beam end), w indicates an
equally distributed load (N/mm), and l is the span (mm).
[0006]
[0007]
3
5
[0008]
Meanwhile, in a case where the joints of both ends of the steel beam are pin
joints, as shown in FIG. 26, the bending moment generated in the steel beam is
maximized at the center portion of the span, and the moment MA of the end portion of the
beam and the moment MC of a span center are obtained by the following Expression (3)
and Expression (4).
[0009]
[0010]
10
Citation List
Patent Literature
[0011]
15 [Patent Document 1] Japanese Unexamined Utility Model Application, First
Publication No. H05-57107
[Patent Document 2] Japanese Unexamined Patent Application, First
Publication No. 2000-319984
[Patent Document 3] Japanese Unexamined Patent Application, First
20 Publication No. 2001-193157
[Patent Document 4] Japanese Unexamined Patent Application, First
Publication No. H08-4111
4
[Patent Document 5]
Publication No. 2001-152550
[Patent Document 6]
Publication No. 2012-193613
5
Summary of Invention
Technical Problem
[0012]
However, first, in the case where the joint is assembled and processed in
10 advance in a factory or the clip construction method is adopted, processing labor or a
special member (clip) is required, which increases costs.
[0013]
In addition, in a case where the joint is not assembled and processed in advance
in a factory or the clip construction method is not adopted, the shear reinforcement is
15 fixed using a 135° hook or a 90° hook. However, even in this case, it is necessary to
carry out a very difficult work of bending the shear reinforcement in a predetermined
hook shape after causing the shear reinforcement to penetrate the steel beam at the work
site. A through-hole of the steel beam is machined to be a long hole such that the
hook-processed shear reinforcement can easily penetrate the steel beam. However, in
20 this case, cross-sectional defect portions of the steel beam increase.
[0014]
Next, if it is possible to adjust a degree of fixation of the steel beam by
evaluating the column-beam joint as a semi-rigid joint, it is possible to balance the
bending moment of the end portion of the beam and the bending moment of the span
25 center. Accordingly, compared to the cases of the rigid j oint and the pin j oint, like the
5
Japanese Unexamined Patent Application, First
Japanese Unexamined Patent Application, First
following Expression (5), it is possible to decrease the maximum moment.
[0015]
[0016]
5 Patent Document 5 or Patent Document 6 is an example in which the
column-beam joint is a semi-rigid joint. However, Patent Document 5 and Patent
Document 6 are not intended for a composite structure building configured of a PCaRC
column and a steel beam, and in Patent Document 5 and Patent Document 6, the
configuration of the column-beam joint is complicated. In Patent Document 5 and
10 Patent Document 6, any design method is not disclosed or suggested.
Solution to Problem
[0017]
The present invention adopts the following aspects in order to solve the
15 above-described problems.
[0018]
(1) According to one aspect of the present invention, there is provided a joint
structure of a reinforced concrete column and a steel beam configured to form a recess in
a reinforced concrete column, insert an end portion of the steel beam into the recess, and
20 fill the recess with a concrete so as to join the reinforced concrete column and the steel
beam, in which a degree of fixation of the steel beam is adjusted by adjusting an
embedded length of the end portion of the steel beam to the concrete filling the recess,
and by adjusting the degree of fixation, the end portion of the steel beam is semi-rigidly
6
joined to the reinforced concrete column, and a bending moment acting on the steel beam
and a joint which joints the reinforced concrete column and the steel beam is adjusted.
[0019]
(2) In the joint structure of a reinforced concrete column and a steel beam
5 described in (1), a relationship between the degree of fixation and an embedded length
ratio which is a ratio between the embedded length and a beam height of the steel beam is
obtained, and, based on the relationship between the degree of fixation and the embedded
length ratio, the degree of fixation may be set such that a bending moment at a column
face position and a maximum moment in a span of the steel beam balance each other.
10 [0020]
According to the joint structure of a reinforced concrete column and a steel
beam described in (1) or (2), the design of the degree of fixation of the joint which is
difficult in the related art is easily carried out by adjusting the embedded length of the
steel beam.
15 [0021]
In addition, according to the joint structure of a reinforced concrete column and
a steel beam described in (1) or (2), it is possible to optimize the generation moment of
the steel beam by designing the degree of fixation of the joint. Accordingly, the size of
the cross-section is decreased, and it is possible to reduce costs.
20 [0022]
(3) According to another aspect of the present invention, there is provided a
method of joining a reinforced concrete column and a steel beam, including: inserting an
end portion of a steel beam into a recess formed in a reinforced concrete column;
inserting a right angle hook of a shear reinforcement including a semicircular hook or an
25 acute angle hook on one end side and the right angle hook on the other end side into a
7
through-hole formed in a web of the steel beam, and rotating the shear reinforcement at a
center of a bent portion of the right angle hook, and installing the shear reinforcement
such that the right angle hook is arranged along the web of the steel beam; fixing the
semicircular hook or the acute angle hook on the one side of the shear reinforcement to
5 an auxiliary reinforcement arranged in the recess or a main reinforcement of the
reinforced concrete column protruding toward the recess; and placing concrete in the
recess.
[0023]
(4) According to still another aspect of the present invention, there is provided a
10 joint structure of a reinforced concrete column and a steel beam, in which an end portion
of a steel beam is inserted into a recess formed in a reinforced concrete column, a shear
reinforcement including a semicircular hook or an acute angle hook on one end side and
a right angle hook on the other end side is installed such that the right angle hook is
inserted into a through-hole formed in a web of the steel beam and the right angle hook is
15 arranged along the web of the steel beam, the semicircular hook or the acute angle hook
on the one side of the shear reinforcement is fixed to an auxiliary reinforcement arranged
in the recess or a main reinforcement of the reinforced concrete column protruding
toward the recess, and concrete is placed in the recess such that the end portion of the
steel beam, the shear reinforcement, and the auxiliary reinforcement or the main
20 reinforcement of the reinforced concrete column is embedded in the recess.
[0024]
In the method of joining a reinforced concrete column and a steel beam
described in (3) or the joint structure of a reinforced concrete column and a steel beam
described in (4), a special member such as a clip (that is used in the related art) or the like
25 is not required, and the shear reinforcement can be installed while easily penetrating the
8
steel beam at the work site. In this case, since the shear reinforcement can easily
penetrate the through-hole of the steel beam having the size in the related art to be
installed, and cross-sectional defects of the steel beam are not increased.
[0025]
5 (5) According to still another aspect of the present invention, there is provided a
joint structure of a reinforced concrete column and a steel beam, in which an end portion
of a steel beam is inserted into a recess formed in a reinforced concrete column, a first
shear reinforcement which is connected to the steel beam and is arranged in the recess
and a second shear reinforcement of the reinforced concrete column which protrudes
10 toward the recess are connected to each other using a coupling member, a concrete is
placed in the recess, and the end portion of the steel beam, the first shear reinforcement,
the second shear reinforcement, and the coupling member are embedded in the concrete,
and the coupling member is a tubular body which is provided to surround outer
circumferences of the first shear reinforcement and the second shear reinforcement
15 arranged in the recess and is crimped to each of the first shear reinforcement and the
second shear reinforcement.
[0026]
In the joint structure of a reinforced concrete column and a steel beam described
in (5), the end portion of the second shear reinforcement of the steel frame concrete
20 column and the end portion of the first shear reinforcement connected to the steel beam
and arranged in the recess are inserted into the tubular body, and the shear reinforcements
are crimped by the tubular body which surrounds the shear reinforcements. That is, the
first shear reinforcement and the second shear reinforcement are joined to each other by
crimping of the tubular body serving as a coupling member. Accordingly, it is possible
25 to easily install the shear reinforcement of the joint of the reinforced concrete column and
9
the steel beam.
[0027]
(6) According to still another aspect of the present invention, there is provided a
joint structure of a reinforced concrete column and a steel beam, in which in a joint of the
5 reinforced concrete column and the steel beam, a shear reinforcement of the reinforced
concrete column is configured of a first shear reinforcement and a second shear
reinforcement, and a tubular body in which the first shear reinforcement is inserted from
one end portion and the second shear reinforcement is inserted from the other end portion
is provided, the first shear reinforcement is inserted into a hole portion formed in the
10 steel beam, the second shear reinforcement is arranged between the first shear
reinforcements adjacent to each other around an axis of the reinforced concrete column,
and the tubular body is crimped to the first shear reinforcement and the second shear
reinforcement to surround outer circumferences of the first and second shear
reinforcements.
15 [0028]
(7) According to still another aspect of the present invention, there is provided a
method of joining a reinforced concrete column and a steel beam, in which in a joint of
the reinforced concrete column and the steel beam, a shear reinforcement of the
reinforced concrete column is configured of a first shear reinforcement and a second
20 shear reinforcement, and a tubular body in which the first shear reinforcement is inserted
from one end portion and the second shear reinforcement is inserted from the other end
portion is provided, the first shear reinforcement is inserted into a hole portion formed in
the steel beam, and the second shear reinforcement is arranged between the first shear
reinforcements adjacent to each other around an axis of the reinforced concrete column,
25 the method including: a hole portion forming process of forming a hole portion in the
10
steel beam; a first shear reinforcement installation process of inserting the first shear
reinforcement into the hole portion; a shear reinforcement tubular body insertion process
of inserting the first shear reinforcement into the tubular body from the one end portion
and inserting the second shear reinforcement into the tubular body from the other end
5 portion; and a crimping process of crimping the tubular body to the first shear
reinforcement and the second shear reinforcement to surround outer circumferences of
the first and second shear reinforcements.
[0029]
In the joint structure of a reinforced concrete column and a steel beam described
10 in (6) or the method of joining a reinforced concrete column and a steel beam described
in (7), the first shear reinforcement inserted into the hole portion of the steel beam and
the second shear reinforcement arranged between the first shear reinforcements adjacent
to each other around the axes of the steel beam and the reinforced concrete column are
inserted into the tubular body, and the tubular body crimps the first shear reinforcement
15 and the second shear reinforcement so as to surround the first shear reinforcement and
the second shear reinforcement. That is, the first shear reinforcement and the second
shear reinforcement are joined to each other by the crimping of the tubular body with
respect to the first shear reinforcement and the second shear reinforcement.
[0030]
20 Therefore, according to the joint structure of a reinforced concrete column and a
steel beam described in (6) or the method of joining a reinforced concrete column and a
steel beam described in (7), since the tubular body is crimped to the first shear
reinforcement and the second shear reinforcement inserted into the tubular body so as to
join the first shear reinforcement and the second shear reinforcement to each other, it is
25 possible to easily install the shear reinforcement of the joint of the reinforced concrete
11
column and the steel beam.
[0031]
In addition, according to the joint structure of a reinforced concrete column and
a steel beam described in (6) or the method of joining a reinforced concrete column and a
5 steel beam described in (7), since a special member such as a clip for joining the first
shear reinforcement and the second shear reinforcement is not required, compared to a
case where the special member is used, it is possible to reduce costs.
[0032]
According to the joint structure of a reinforced concrete column and a steel
10 beam described in (6) or the method of joining a reinforced concrete column and a steel
beam described in (7), since the hole portion formed in the steel beam may have any
shape as long as it has a diameter which is slightly larger than the outer diameter of the
first shear reinforcement, it is possible to easily form the hole portion and it is possible to
decrease cross-sectional defect portions of the steel beam.
15 [0033]
(8) In the joint structure of a reinforced concrete column and a steel beam
described in (6), the first shear reinforcement and the second shear reinforcement may be
arranged such that tip portions of the first and second shear reinforcements abut on each
other inside the tubular body.
20 [0034]
In this case, compared to a case where the first shear reinforcement and the
second shear reinforcement are arranged to overlap each other, it is possible to decrease
the diameter of a steel pipe.
[0035]
25 (9) In the joint structure of a reinforced concrete column and a steel beam
12
described in (6), the first shear reinforcement and the second shear reinforcement may be
arranged to overlap each other inside the tubular body.
[0036]
In this case, since any shape may be adopted as long as the tubular body is
5 crimped to the portion in which the first shear reinforcement and the second shear
reinforcement overlap each other, compared to the case where the first shear
reinforcement and the second shear reinforcement are arranged such that the tip portions
abut on each other, it is possible to decrease the length (length of the coupling) of the
tubular body.
10
Advantageous Effects of Invention
[0037]
According to the joint structure of a reinforced concrete column and a steel
beam and the method of joining a reinforced concrete column and a steel beam of the
15 present invention, processing of the steel frame is easily carried out, and the joining of
the reinforced concrete column and the steel beam can be easily carried out.
[0038]
In addition, according to the joint structure of a reinforced concrete column and
a steel beam and the method of joining a reinforced concrete column and a steel beam of
20 the present invention, semi-rigid joining is carried out with respect to the column-beam
joint, and it is possible to decrease the maximum moment and to rationally (suitably)
configure the column-beam joint.
Brief Description of Drawings
25 [0039]
13
FIG. 1 is a longitudinal sectional view showing a joint structure of a reinforced
concrete column and a steel beam according to a first embodiment.
FIG. 2 is a sectional view taken along line X1-X1 in FIG. 1.
FIG. 3 is a sectional view taken along line X2-X2 in FIG. 1.
5 FIG. 4 is a longitudinal sectional view showing a lower section RC column of
the joint structure of the reinforced concrete column and the steel beam according to the
first embodiment.
FIG. 5 is a sectional view taken along line X1-X1 in FIG. 4.
FIG. 6 is a sectional view taken along line X2-X2 in FIG. 4.
10 FIG. 7 is a diagram showing a relationship between a degree of fixation and an
embedded length ratio of the joint structure of the reinforced concrete column and the
steel beam according to the first embodiment.
FIG. 8 is a diagram showing a relationship between the degree of fixation of the
joint structure of the reinforced concrete column and the steel beam and the maximum
15 moment of the steel beam according to the first embodiment.
FIG. 9 is a view showing a shear reinforcement used in a method of joining a
reinforced concrete column and a steel beam according to a second embodiment.
FIG. 10 is a view showing a state where the shear reinforcement penetrates the
steel beam so as to be installed in the method of joining the reinforced concrete column
20 and the steel beam according to the second embodiment.
FIG. 11 is a side view (longitudinal sectional) view showing the joint structure of
the reinforced concrete column and the steel beam according to the second embodiment.
FIG. 12 is a cross-sectional view showing the joint structure of the reinforced
concrete column and the steel beam according to the second embodiment.
25 FIG. 13 is a front longitudinal sectional view showing the joint structure of the
14
reinforced concrete column and the steel beam according to the second embodiment.
FIG. 14 is a side longitudinal sectional view showing a lower reinforced concrete
column member of the joint structure of the reinforced concrete column and the steel
beam according to the second embodiment.
5 FIG. 15 is a cross-sectional view showing the lower reinforced concrete column
member of the joint structure of the reinforced concrete column and the steel beam
according to the second embodiment.
FIG. 16 is a front longitudinal sectional view showing the lower reinforced
concrete column member of the joint structure of the reinforced concrete column and the
10 steel beam according to the second embodiment.
FIG. 17 is a front longitudinal sectional view showing an upper reinforced
concrete column member of the joint structure of the reinforced concrete column and the
steel beam according to the second embodiment.
FIG. 18 is a perspective view showing an example of a joint of a reinforced
15 concrete column and a steel beam according to a third embodiment.
FIG. 19 is a sectional view taken along line X1-X1 in FIG. 18.
FIG. 20 is a sectional view taken along line X2-X2 in FIG. 18.
FIG. 21 is a view for explaining a steel beam and a first shear reinforcement.
FIG. 22 is a view for explaining a reinforced concrete column before steel
20 frames are arranged.
FIG. 23 is a front view for explaining a joint portion of the first shear
reinforcement and a second shear reinforcement.
FIG. 24 is a sectional view taken along line X1-X1 in FIG. 23.
FIG. 25 is a view for explaining a state before a tubular body is crimped to the
25 first shear reinforcement and the second shear reinforcement.
15
FIG. 26 is a diagram showing a bending moment in a case where a column and a
beam is joined to each other by a both-end pin joint.
FIG. 27 is a diagram showing a bending moment in a case where the column and
the beam are joined to each other by a both-end rigid joint.
5 FIG. 28 is a diagram showing a bending moment in a case where the column and
the beam are joined to each other by a both-end semi-rigid joint.
Description of Embodiments
[0040]
10 Hereinafter, a joint structure of a reinforced concrete column (hereinafter,
referred to as an RC column) and a steel beam according to a first embodiment of the
present invention will be described with reference to FIGS. 1 to 8.
[0041]
Here, in the joint structure of the RC column and the steel beam of the present
15 embodiment, a column-beam joint is a semi-rigid joint as shown in FIG. 28.
Accordingly, a degree of fixation of the column-beam joint can be adjusted, and the
maximum bending moment of the steel beam can be decreased. In addition, the first
embodiment relates to a method capable of decreasing the maximum bending moment of
the steel beam by the joint structure of the RC column and the steel beam so as to
20 rationally design the column-beam joint (steel beam and RC column).
[0042]
First, a joint structure 100 of the RC column and the steel beam of the present
invention includes an RC column 40 of a lower section PCa, a steel beam 41, an RC
column 42 of an upper section PCa, and a joint concrete 43 as main structural elements.
25 The end portion of the steel beam 41 is embedded in the RC column 40 of the lower
16
section PCa, and the steel beam 41 is fixed to the RC column 40 by filling the embedding
portion with the joint concrete 43.
[0043]
Specifically, in the joint structure 100 of the RC column and the steel beam of
5 the present embodiment, as shown in FIGS. 1 to 6, the lower section RC column 40 is
formed by embedding a plurality of main reinforcements 44 extending in a vertical
direction and a plurality of shear reinforcements 45 integrally attached so as to surround
the plurality of main reinforcements 44 in concrete 46. In addition, the main
reinforcements 44 are formed to protrude from the upper surface of the lower section RC
10 column 40.
[0044]
In the lower section RC column 40 of the present embodiment, a rectangular
recess (notch) 47 which is open to the upper surface and one side surface is provided at
the center in the width direction. Since the end portion of the steel beam 41 is inserted
15 into the recess 47 such that the steel beam 41 is joined, a checkered steel plate 48 is
arranged on the inner surface of the recess 47, irregularities are formed on the surface of
the checkered steel plate 48, and the checkered steel plate 48 functions as a shear cotta 49
which transfers shear stress into the joint (column-beam joint).
[0045]
20 Meanwhile, as shown in FIGS. 1 to 3, the steel beam 41 of the present
embodiment does not require processing which expects special structural performance,
and a required length of the steel beam 41 may be any length as long as it can be
embedded in the lower section RC column 40. Accordingly, it is possible to carry a raw
material from a mill manufacturer to the work site as it is and assemble it, and it is
25 possible to reduce costs by promoting a management without fabrication facility.
17
[0046]
In addition, a level adjustment bolt 50 for adjusting a height which is a
temporary member is installed in the lower section RC column 40, and the steel beam 41
includes a triangular rib 51 for preventing out-of-plane deformation of a lower flange
5 when the steel beam 41 receives the own weight through the level adjustment bolt 50.
High nuts 52 are welded at four locations of an upper flange, and the steel beam 41 is
positioned by adjusting (screwing and unscrewing of the bolt 53) a screwing amount of
the bolt 53. The triangular rib 51 and the high nuts 52 can be installed by on-site
welding, and do not require a special management such as ultrasonic flaw detection
10 inspection (UT inspection).
[0047]
The shear reinforcement penetrating the steel beam 41 inside the joint is not
arranged. The shear reinforcements 45 are provided so as to mainly prevent buckling of
the main reinforcements 44, and in the present embodiment, U-shaped shear
15 reinforcements 45 are arranged in the joint.
[0048]
Next, the upper section RC column 42 is formed by embedding the plurality of
main reinforcements 44 extending in the vertical direction and the plurality of shear
reinforcements 45 integrally attached so as to surround the plurality of main
20 reinforcements 44 in concrete 46.
[0049]
In the upper section RC column 42, sleeves 54 which are attached to the lower
ends of the main reinforcements 44 and are open to the lower end surfaces are embedded
in the concrete 46.
25 [0050]
18
The upper section RC column 42 is installed on the lower section RC column 40.
In this case, the main reinforcements 44 protruding from the upper surface of the lower
section RC column 40 are inserted into the sleeves 54 of the upper section RC column 42,
the insides of the sleeves 54 are filled with grout, and the upper section RC column 42 is
5 integrally joined to the lower section RC column 40. Joint grout is injected a portion
between the upper section RC column 42 and the lower section RC column 40.
[0051]
Next, at the step where the lower section RC column 40 is installed, the end
portion of the steel beam 41 is inserted into the recess 47 of the lower section RC column
10 40 and the steel beam 41 is arranged. In addition, a formwork is installed and concrete
43 is placed in the recess 47. In this case, the joint concrete 43 can use general concrete
which is prepared, the steel beam 41 is installed in the lower section RC column 40, and
the joint concrete 43 is placed at the same time when a floor slab is placed. A gap
between the four inner surfaces of the recess 47 and the steel beam 41 is secured to be
15 approximately 100 mm. In FIG. 1, a reference numeral 55 indicates a top end (an upper
surface of the floor slab) of the floor slab.
[0052]
In this way, the joint A of the RC column and the steel beam 2 of the present
embodiment is configured, and it is possible to join the RC column 1 and the steel beam
20 by a semi-rigid joint.
[0053]
Next, a design method of the joint structure 100 of the RC column and the steel
beam of the present embodiment will be described.
[0054]
25 In the embodiment, the degree of fixation of the joint structure 100 of the RC
19
column and the steel beam realized by a semi-rigid joint is adjusted by an embedded
length of the steel beam 41.
[0055]
Here, if a moment of a column face position of the column-beam joint is
5 non-dimensionalized by a moment of the end portion in a case of fixed support, the
following Expression (6) is obtained. In addition, rigMA (= MA fixed) indicates a
moment when is fixed (a moment at the time of a rigid joint), a = 1. 0 indicates when is
completely fixed, and a = 0.0 indicates when is pin-supported.
[0056]
[0057]
FIG. 7 indicates a relationship between a degree of fixation a and an embedded
length ratio d/H (d: embedded length and H: beam height) obtained from FEM analysis.
From this drawing, it was confirmed that the degree of fixation a increased as the
15 embedded length ratio d/H increased.
[0058]
Moreover, the degree of fixation a of the column-beam joint is given by the
following Expression (7) from the result of FIG. 7, and it is possible to obtain the degree
of fixation a when the embedded length ratio d/H of the steel beam 2 is adjusted, by
20 Expression (7). In addition, N/N0 is an axial force ratio.
[0059]
20
[0060]
Next, FIG. 8 indicates a relationship between the degree of fixation a and the
maximum moment (max (MA, M0)) of the beam 41. As shown in FIG. 8, MA = M0 when
5 the degree of fixation a =0.69, and the maximum moment is the minimum value. That
is, according to the joint structure 100 of the RC column and the steel beam of the
present embodiment, it was confirmed that the moment for the design of the beam could
be made 0.69 times as compared to the case where the column is rigidly joined.
[0061]
10 Next, a flow of optimum design of a steel beam cross-section is shown.
[0062]
First, design conditions such as the span l, the load w, the axial force ratio, or a
material to be used of the steel beam 41 are set.
[0063]
15 Next, from the following Expressions (8), (9), and (10), an end portion moment
when the end portion is fixed is calculated and a provisional section is determined. A
central moment and maximum deformation are calculated. E is Young’s modulus of the
steel beam and I is a cross-sectional secondary moment of the steel beam.
[0064]
[0065]
21
5
10
15
[0066]
[0067]
Next, the degree of fixation a of the joint A at the time of the semi-rigid joint is
determined, and the embedded length d is determined. In this case, the optimum value
of the degree of fixation a is 0.69, and in a case where N/N0 = 0.2, the embedded length
ratio d/H = (a - 0.55) / (0.52 x 0.20 + 0.90) + 0.30 = 0.46, and it is preferable when the
embedded length d which is approximately half of the beam height H is secured.
[0068]
Next, the end portion moment, the central moment, and the maximum
deformation when the degree of fixation is a are calculated by the following Expressions
(11), (12), and (13), and the cross-section is determined.
[0069]
[0070]
[0071]
22
[0072]
Moreover, the joint strength of the embedded portion is confirmed, and when
OK (good) is determined, the design is completed. In a case where NG (bad) is
determined, the degree of fixation a of the semi-rigid joint is changed, the embedded
5 length d is changed, and calculation is carried out again.
[0073]
Accordingly, in the joint structure 100 of the RC column and the steel beam of
the present embodiment, the design of the degree of fixation a of the joint which is
difficult in the related art is easily carried out by adjusting the embedded length d of the
10 steel beam 41.
[0074]
Moreover, it is possible to optimize the generation moment of the steel beam 41
by designing the degree of fixation a of the joint A. Accordingly, the size of the
cross-section is decreased, and it is possible to reduce costs.
15 [0075]
Hereinbefore, the first embodiments of the joint structure of the reinforced
concrete column and the steel beam according to the present invention are described.
However, the present invention is not limited to the first embodiments and can be
appropriately modified within a scope which does not depart from the gist.
20 [0076]
Next, a joint structure of an RC column (reinforced concrete column) and a steel
beam and a method of joining an RC column and a steel beam according to a second
embodiment of the present invention will be described with reference to FIGS. 9 to 17.
Here, the method of joining the RC column and the steel beam according to the second
23
embodiment relates a method of joining the RC column and the steel beam while
allowing a shear reinforcement to penetrate the steel beam at the work site so as to fix the
shear reinforcement to the steel beam.
[0077]
5 In the method of joining the RC column and the steel beam and a joint structure
200 of the RC column and the steel beam according to the second embodiment, as shown
in FIG. 9, a used shear reinforcement 1 is formed to include a semicircular hook (180°
hook) (or acute angle hook) 2 on one end side and a right angle hook (90° hook) 3 on the
other end side.
10 [0078]
Moreover, as shown in FIGS. 9 and 10, a folding radius (an inner diameter of a
bent portion) d of the right angle hook 3 is equal to or more than a plate thickness tw of a
web 4a of a penetrated steel beam 4. In addition, a diameter R of a through-hole 4b of
the steel beam 4 through which the shear reinforcement 1 penetrates is equal to or more
15 than an outermost diameter D of the shear reinforcement 1.
[0079]
Moreover, when the shear reinforcement 1 is installed, as shown in FIG. 10, the
other end on the right angle hook 3 side is inserted into the through-hole 4b of the steel
beam 4, rotates with a bent portion of a base end of the right angle hook 3 as a rotation
20 center, and the shear reinforcement rotates by 90° around the through-hole 4b along the
folding radius d of the bent portion. Accordingly, the shear reinforcement 1 penetrates
the through-hole 4b of the steel beam 4, and it is possible to install the shear
reinforcement 1 such that the right angle hook 3 is arranged along the web 4a of the steel
beam 4. In this way, if the semicircular hook 2 on the one side of the shear
24
reinforcement 1 arranged to penetrate the steel beam 4 is fixed to the column main
reinforcement or the like, the installation work of the shear reinforcement 1 is completed.
[0080]
Here, as an example of an embedding type joint structure 200 of an RC column
5 5 of PCa and the steel beam 4 shown in FIGS. 11 to 13, the method of joining the RC
column 5 and the steel beam 4 according to the first embodiment will be more
specifically described.
[0081]
First, the RC column 5 of PCa of the joint structure 200 is configured by
10 integrally joining the upper RC column member 5a and the lower RC column member 5b.
In addition, as shown in FIGS. 11 to 16, the lower RC column member 5b is formed by
embedding a plurality of main reinforcements 6 extending in a vertical direction and a
plurality of shear reinforcements 7 integrally attached so as to surround the plurality of
main reinforcements 6 in concrete 8. In addition, a joint plate (end plate) 10 for
15 connecting (bolt-joining) the RC columns 5 of PCa adjacent to each other in the vertical
direction is integrally attached to the lower end of the lower RC column member 5b.
The main reinforcements 6 are formed to protrude from the surface of the lower RC
column member 5b.
[0082]
20 In the lower RC column member 5b, a rectangular recess (notch) 11 which is
open to the upper surface and the side surfaces is provided at the center in the width
direction. The recess 11 is configured such that the end portion of the steel beam 4 is
inserted into the recess 11 and the steel beam 4 is joined to the recess 11, and a shear
cotta (checkered steel plate) 12 is formed to be integrated with the concrete 8.
25 [0083]
25
As shown in FIGS. 11 to 13 and FIG. 17, the upper RC column member 5a is
formed by embedding the plurality of main reinforcements 6 extending in a vertical
direction and the plurality of shear reinforcements 7 integrally attached so as to surround
the plurality of main reinforcements 6 in the concrete 8, and the joint plate (end plate) 10
5 for connecting (bolt-joining) the RC columns 5 of PCa adjacent to each other in the
vertical direction is integrally attached to the upper end of the upper RC column member
5a.
[0084]
In the upper RC column member 5a, sleeves 13 which are attached to the lower
10 ends of the main reinforcements 6 and are open to the lower end surfaces are embedded
in the concrete 8.
[0085]
In addition, as shown in FIGS. 11 to 13, in the upper RC column member 5a and
the lower RC column member 5b configured as described above, the lower RC column
15 member 5b is placed on the upper end joint plate 10 of the lower RC column 5 of PCa,
and the mutual joint plates 10 are bolt-joined. Next, the upper RC column member 5a is
installed on the lower RC column member 5b. In this case, the main reinforcements 6
protruding from the upper surface of the lower RC column member 5b are inserted into
and connected to the sleeves 13 of the upper RC column member 5a, and the upper RC
20 column member 5a is integrally joined to the lower RC column member 5b.
Accordingly, the RC column 5 of PCa is formed on each of the upper end and the lower
end.
[0086]
Meanwhile, in the method of joining the RC column 5 and the steel beam 4
25 according to the second embodiment, at a step where the lower RC column member 5b is
26
installed, the end portion of the steel beam 4 is inserted into the recess 11 of the lower
RC column member 5b and the steel beam 4 is arranged.
[0087]
As shown in FIGS. 9, 10, and 11 to 13, the right angle hook 3 is inserted into the
5 through-hole 4b formed in the steel beam 4, the shear reinforcement 1 rotates by 90°
around the through-hole 4b along the folding radius d of the right angle hook 3 so as to
be installed. The semicircular hook 2 of the shear reinforcement 1 arranged to penetrate
the steel beam 4 is fixed to an auxiliary reinforcement 14 which is inserted into the recess
11 after the shear reinforcement 1 is inserted.
10 In addition, the main reinforcement 6 of the lower RC column member 5b may
protrude toward the recess 11 so as to fix the semicircular hook (or acute angle hook) 2
of the shear reinforcement 1 to the main reinforcement 6.
[0088]
As described above, at the step where the steel beam 4, the shear reinforcement
15 1, or the like is installed, the upper RC column member 5a is installed. Moreover, a
formwork is installed, the concrete 8 is placed in the recess 11, the end portion of the
steel beam 4, the shear reinforcement 1, and the auxiliary reinforcement 14 (or main
reinforcement 6) are embedded in the concrete 8, and the RC column 5 and the steel
beam 4 are integrally joined to each other.
20 [0089]
Therefore, according to the joint structure 200 of the RC column and the steel
beam and the method of joining the RC column and the steel beam of the second
embodiment, a special member such as a clip (that is used in the related art) or the like is
not required, and the shear reinforcement 1 can be installed while easily penetrating the
25 steel beam 4 at the work site. In this case, since the shear reinforcement 1 can easily
27
penetrate the through-hole 4b of the steel beam 4 having the size in the related art to be
installed, and cross-sectional defects of the steel beam 4 are not increased.
[0090]
Hereinbefore, the second embodiments of the joint structure of the RC column
5 and the steel beam and the method of joining the RC column and the steel beam
according to the present invention are described. However, the present invention is not
limited to the second embodiments and can be appropriately modified within a scope
which does not depart from the gist.
[0091]
10 For example, in the second embodiment, the shear reinforcement 1 is formed to
include the semicircular hook or the acute angle hook 2 on one end side and the right
angle hook 3 on the other end side.
[0092]
Meanwhile, a straight bar-shaped shear reinforcement (first shear reinforcement)
15 1 which does not include a circular hook, the acute angle hook 2, or the right angle hook
3 may be used, and the first shear reinforcement 1 may be connected to the shear
reinforcement (second shear reinforcement) of the RC column 5, which protrudes from
the RC column 5 to the recess 11, using a crimp coupler (coupling member).
[0093]
20 In addition, a tubular body 30 described in detail later (shown in a third
embodiment) may be used as the coupling member of the crimp coupler. In this case, a
second shear reinforcement (23: refer to FIGS. 22 and 23) and the first shear
reinforcement 1 which are integrally embedded in the RC column 5 and include end
portions protruding toward the recess 11 are inserted into the tubular body 30, and the
25 first shear reinforcement 1 and the second shear reinforcement (24) can be crimped by
28
the tubular body 30. In this way, since the first shear reinforcement 1 and the second
shear reinforcement (24) are joined by the crimping of the tubular body 30 serving as the
coupling member, it is possible to easily install the shear reinforcement of the joint of the
RC column 5 and the steel beam 4, and as a result, it is possible to suitably join the RC
5 column 5 and the steel beam 4.
[0094]
Next, a joint structure of an RC column (reinforced concrete column) and a steel
beam and a method of joining an RC column and a steel beam according to a third
embodiment of the present invention will be described with reference to FIG. 18 to 25.
10 [0095]
As shown in FIGS. 18 to 20, a joint structure 300 of an RC column and a steel
beam according to the third embodiment has a structure of a joint 22 in which steel
beams 21 are joined to an RC column 20 having an approximately square cross-sectional
shape from four sides. Moreover, in FIG. 18, the first shear reinforcement 23 and the
15 second shear reinforcement 24 of the joint 22 of the RC column 20 and the steel beams
21 are omitted.
[0096]
As shown in FIGS. 19 to 21, for example, in the case of which each of the steel
beams 21 is an H-shaped steel, the steel beams 21 are jointed at the joint 22 that connects
20 the RC column 20 and the steel beams 21 so that one steel beam 21 extending in a
horizontal direction and the other steel beam 21 extending in a direction orthogonal to the
horizontal direction are joined to be orthogonal to each other. In each steel beam 21,
hole portions 26 into which the first shear reinforcement 23 of the RC column 20 is
inserted are formed in the webs 25 of the portions embedded in the RC column 20.
25 [0097]
29
A plurality of column main reinforcements 27, the plurality of first shear
reinforcements 23 inserted into the steel beams 21, and the plurality of second shear
reinforcements 24 which are not inserted into the steel beams 21, are respectively
arranged between the adjacent first shear reinforcements 23 around the axis of the RC
5 column 20, and are joined to the first shear reinforcements 23 are embedded in the joint
22 of the RC column 20 and the steel beam 21. In the third embodiment, each of the
plurality of first shear reinforcements 23 shown in FIGS. 19 to 21 is formed in a linear
shape. In addition, each of the plurality of second shear reinforcements 24 shown in
FIGS. 19 to 21 is formed to be bent to have an approximately L shape.
10 [0098]
In the third embodiment, as shown in FIG. 19, four first shear reinforcements 23
and four second shear reinforcements 24 are alternately arranged one by one at the same
height around the axis of the RC column 20 and are arranged to draw an approximately
square shape in a plan view. A plurality of shear reinforcements configured of four first
15 shear reinforcements 23 and four second shear reinforcements 24 arranged to draw an
approximately square shape in a plan view are arranged in the height direction.
For each of the plurality of first shear reinforcements 23 and the plurality of
second shear reinforcements 24, a deformed reinforcement such as D10 (SD345) is used.
[0099]
20 As shown in FIGS. 23 and 24, in the joint portion of the first shear
reinforcement 23 and the second shear reinforcement 24, a tip portion 28 of the first
shear reinforcement 23 and a tip portion 29 of the second shear reinforcement 24 are
inserted into the tubular body 30, and the tubular body 30 is are crimped to the tip portion
28 and the tip portion 29.
25 [0100]
30
For example, for the tubular body 30, a carbon steel pipe for pressure piping of
STPG 370 or the like is used. The tip portion 28 of the first shear reinforcement 23 is
inserted into the tubular body 30 from one side in an axial direction and the tip portion 29
of the second shear reinforcement 24 is inserted into the tubular body 30 from the other
5 side in the axial direction. The tip portion 28 of the first shear reinforcement 23 and the
tip portion 29 of the second shear reinforcement 24 inserted into the tubular body 30
coaxially abut on each other.
[0101]
As shown in FIG. 25, the tubular body 30 is formed in a cylindrical shape when
10 the tubular body 30 is manufactured, and as shown in FIGS. 23 and 24, the tubular body
30 is deformed when the tubular body 30 is crimped to the tip portion 28 of the first shear
reinforcement 23 and the tip portion 29 of the second shear reinforcement 24.
In the third embodiment, the crimping of the tubular body 30 with respect to the
tip portion 28 of the first shear reinforcement 23 and the tip portion 29 of the second
15 shear reinforcement 24 is carried out by a crimping tool having a hexagonal compression
dice which can press the tubular body 30 in a state where the tubular body 30 is
interposed by the compression dice in a direction orthogonal to the axis.
[0102]
The tubular body 30 is crimped to the tip portion 28 of the first shear
20 reinforcement 23 and the tip portion 29 of the second shear reinforcement 24 so as to
surround the outer circumferences of the first and second shear reinforcements 23 and 24
by pressing the tubular body 30 using the crimping tool.
[0103]
Since the tubular body 30 is crimped to the tip portion 28 of the first shear
25 reinforcement 23 and the tip portion 29 of the second shear reinforcement 24, a node 31
31
of the first shear reinforcement 23 and a node 32 of the second shear reinforcement 24
are embedded into the tubular body 30.
[0104]
In this way, since the tubular body 30 is crimped to the tip portion 28 of the first
5 shear reinforcement 23 and the tip portion 29 of the second shear reinforcement 24, the
first shear reinforcement 23 and the second shear reinforcement 24 are joined to each
other.
[0105]
Since the tubular body 30 is crimped to the tip portion 28 of the first shear
10 reinforcement 23 and the tip portion 29 of the second shear reinforcement 24 using the
crimping tool having a hexagonal compression dice, the tubular body 30 is pressed by an
approximately uniform compression force in the entire circumferential direction.
Accordingly, it is possible to prevent the tubular body 30 from being deformed to be bent.
In addition, when a stopper function by which a load is removed if a predetermined load
15 is applied to the crimping tool is provided, a compression load by which the tubular body
6 is pressed is easily managed constantly, and a quality of the joint 22 of the RC column
20 and the steel beam 21 is easily managed.
In the third embodiment, the tubular body 30 is crimped (pressed) by the
crimping tool at a plurality of locations with gaps in a length direction of the tubular
20 body 30.
[0106]
Next, the method of joining the RC column and the steel beam according to the
third embodiment will be described.
First, a hole portion forming process of forming hole portions 26 through which
25 the first shear reinforcements 23 are inserted into the webs 25 of the steel beams 21 is
32
performed. In addition, a steel beam joining process of joining the steel beams 21 in a
state where the steel beams 21 are orthogonal to each other is also performed before or
after the hole portion forming process.
[0107]
5 In the method of joining the RC column and the steel beams according to the
third embodiment, the hole portion forming process is performed at a factory or the like,
and the steel beams 21 in which the hole portions 26 are formed are carried to the work
site. In addition to the hole portion forming process, the steel beam joining process may
be also performed at a factory or the like, and the steel beams 21 to which the hole
10 portions 26 are formed and which are joined to be orthogonal to each other may be
carried to the work site.
[0108]
A steel beam installation process of installing the steel beams 21, which include
the hole portions 26 formed on the webs 25 and are joined to be orthogonal to each other,
15 on the joint 22 is performed.
[0109]
A first shear reinforcement installation process of inserting the first shear
reinforcements 23 into the hole portions 26 of the web 25 is performed. In the steel
beam installation process and the first shear reinforcement installation process, the first
20 shear reinforcement installation process may be performed first, and the steel beam
installation process may be performed after the first shear reinforcements 4 are
temporarily set to the steel frame.
[0110]
A shear reinforcement insertion process of inserting the tip portions 28 of the
25 first shear reinforcement 23 into the tubular bodies 30 and inserting the tip portions 29 of
33
the second shear reinforcements 24 into the tubular bodies 30 is performed.
[0111]
A crimping process of causing the tubular bodies 30 to crimp the tip portions 28
of the first shear reinforcements 23 and the tip portions 29 of the second shear
5 reinforcements 24 to surround the outer circumferences of the first and second shear
reinforcements is performed.
[0112]
In the crimping process, the tubular bodies 30 are crimped to the tip portions 28
of the first shear reinforcements 23 and the tip portions 29 of the second shear
10 reinforcements 24 using the crimping tool having a hexagonal compression dice. Each
of the tubular bodies 30 is crimped (pressed) by the crimping tool in a plurality of
locations with gaps in the length direction of the tubular body 30.
In this way, the first shear reinforcements 23 and the second shear
reinforcements 24 are joined to each other.
15 [0113]
Next, the formwork of the joint 22 is installed, and a concrete material is placed
inside the formwork and is hardened. In this way, the RC column 20 and the steel
beams 21 are joined to each other.
[0114]
20 Hereinafter, effects of the joint structure 300 of the RC column and the steel
beam and the method of joining the RC column and the steel beam according to the third
embodiment will be described with reference to the drawings.
[0115]
In the joint structure 300 of the RC column and the steel beam and the method
25 of joining the RC column and the steel beam according to the third embodiment, if the tip
34
portions 28 of the first shear reinforcements 23 and the tip portions 29 of the second
shear reinforcements 24 are inserted into the tubular bodies 30 and the tubular bodies 30
are crimped to the first shear reinforcements 23 and the second shear reinforcements 24
inserted into the tubular bodies. Therefore, the first shear reinforcements 23 and the
5 second shear reinforcements 24 are joined to each other. Accordingly, it is possible to
easily install the shear reinforcements of the joint 22 of the RC column 20 and the steel
beams 21, and it is possible to easily construct the joint 22 of the RC column 20 and the
steel beams 21.
[0116]
10 In addition, since a special member such as a clip for joining the first shear
reinforcement 23 and the second shear reinforcement 24 is not required, compared to a
case where the special member is used, it is possible to reduce costs.
[0117]
In addition, since each of the hole portions 26 formed in the web 25 of each steel
15 beam 21 may have any shape as long as it has a diameter which is slightly larger than the
outer diameter of the first shear reinforcement 23, it is possible to easily form the hole
portions 26 and it is possible to decrease cross-sectional defect portions of the steel
beams 21.
[0118]
20 Since the first shear reinforcement 23 and the second shear reinforcement 24 are
arranged such that the tip portions thereof abut on each other inside the tubular body 30,
compared to a case where the first shear reinforcement 23 and the second shear
reinforcement 24 are arranged to overlap each other, it is possible to decrease the
diameter of the tubular body 30.
25 [0119]
35
Hereinbefore, the third embodiments of the joint structure of the RC column and
the steel beam and the method of joining the RC column and the steel beam according to
the present invention are described. However, the present invention is not limited to the
third embodiments and can be appropriately modified within a scope which does not
5 depart from the gist.
[0120]
For example, in the third embodiment, the steel beams 21 are joined to be
orthogonal to each other. However, the steel beams 21 may extend in only one direction
and may be joined to intersect each other unlike to the case of being orthogonal to each
10 other.
[0121]
In the third embodiment, the tubular bodies 30 are crimped to the tip portions 28
of the first shear reinforcements 23 and the tip portions 29 of the second shear
reinforcements 24 using the crimping tool having a hexagonal compression dice.
15 However, the tubular bodies 30 may be crimped to the tip portions 28 of the first shear
reinforcements 23 and the tip portions 29 of the second shear reinforcements 24 using
other crimping tools.
[0122]
In the third embodiment, the first shear reinforcements 23 and the second shear
20 reinforcements 24 are arranged such that the tip portions 28 of the first shear
reinforcements 23 and the tip portions 29 of the second shear reinforcements 24 abut on
each other inside the tubular bodies 30. However, the first shear reinforcements 23 and
the second shear reinforcements 24 may be arranged such that the tip portions 28 of the
first shear reinforcements 23 and the tip portions 29 of the second shear reinforcements
25 24 overlap each other inside the tubular bodies 30. Moreover, the tip portions 28 of the
36
first shear reinforcements 23 and the tip portions 29 of the second shear reinforcements
24 overlap each other inside the tubular bodies 30, and the vicinities of the tip portions 28
of the first shear reinforcements 23 and the vicinities of the tip portions 29 of the second
shear reinforcements 24 may protrude from sides opposites to the sides inserted into the
5 tubular bodies 30.
Industrial Applicability
[0123]
According to the joint structure of a reinforced concrete column and a steel
10 beam and the method of joining a reinforced concrete column and a steel beam of the
present invention, processing of the steel frame is easily carried out, and the joining of
the reinforced concrete column and the steel beam can be easily carried out. In addition,
according to the joint structure of a reinforced concrete column and a steel beam and the
method of joining a reinforced concrete column and a steel beam of the present invention,
15 the column-beam joint is carried out by semi-rigid joining, and it is possible to decrease
the maximum moment and to rationally (suitably) configure the column-beam joint.
Reference Signs List
[0124]
20 1: shear reinforcement
2: semicircular hook (or acute angle hook)
3: right angle hook
4: steel beam
4a: web
25 4b: through-hole
37
5: RC column (reinforced concrete column)
5a: upper RC column member
5b: lower RC column member
6: main reinforcement
5 7: shear reinforcement
8: concrete
10: end plate
11: recess (notch)
12: shear cotta (checkered steel plate)
10 13: sleeve
14: auxiliary reinforcement
20: RC column (reinforced concrete column)
21: steel beam
22: joint
15 23: first shear reinforcement
24: second shear reinforcement
25: web
26: hole portion
30: tubular body
20 40: lower section RC column
41: steel beam
42: upper section RC column
43: joint concrete
44: main reinforcement
25 45: shear reinforcement
38
46: concrete
47: recess (notch)
48: checkered steel plate
49: shear cotta
5 50: level adjustment bolt
51: triangular rib
52: high nut
53: bolt
54: sleeve
10 100: joint structure of RC column and steel beam
200: joint structure of RC column and steel beam
300: joint structure of RC column and steel beam

We claim:
1. A joint structure of a reinforced concrete column and a steel beam,
wherein the reinforced concrete column and the steel beam is configured to
5 insert an end portion of the steel beam into a recess formed in the reinforced concrete
column and fill the recess with a concrete so as to join the reinforced concrete column
and the steel beam,
wherein a degree of fixation of the steel beam is adjusted by adjusting an
embedded length of the end portion of the steel beam to the concrete filling the recess,
10 and
wherein, by adjusting the degree of fixation, the end portion of the steel beam is
semi-rigidly joined to the reinforced concrete column, and a bending moment acting on
the steel beam and a joint which joints the reinforced concrete column and the steel beam
is adjusted.
15 2. The joint structure of a reinforced concrete column and a steel beam
according to claim 1,
wherein a relationship between the degree of fixation and an embedded length
ratio which is a ratio between the embedded length and a beam height of the steel beam is
obtained, and
20 wherein, based on the relationship between the degree of fixation and the
embedded length ratio, the degree of fixation is set such that a bending moment at a
column face position and a maximum moment in a span of the steel beam balance each
other.
3. A method of joining a reinforced concrete column and a steel beam,
25 comprising:
40
inserting an end portion of the steel beam into a recess formed in the reinforced
concrete column;
inserting a right angle hook of a shear reinforcement including a semicircular
hook or an acute angle hook on one end side and the right angle hook on the other end
5 side into a through-hole formed in a web of the steel beam, rotating the shear
reinforcement at a center of a bent portion of the right angle hook, and installing the
shear reinforcement such that the right angle hook is arranged along the web of the steel
beam;
fixing the semicircular hook or the acute angle hook on the one side of the shear
10 reinforcement to an auxiliary reinforcement arranged in the recess or a main
reinforcement of the reinforced concrete column protruding toward the recess; and
placing concrete in the recess.
4. A joint structure of a reinforced concrete column and a steel beam,
wherein an end portion of a steel beam is inserted into a recess formed in a
15 reinforced concrete column,
wherein a shear reinforcement including a semicircular hook or an acute angle
hook on one end side and a right angle hook on the other end side is installed such that
the right angle hook is inserted into a through-hole formed in a web of the steel beam and
the right angle hook is arranged along the web of the steel beam,
20 wherein the semicircular hook or the acute angle hook on the one side of the
shear reinforcement is fixed to an auxiliary reinforcement arranged in the recess or a
main reinforcement of the reinforced concrete column protruding toward the recess, and
wherein concrete is placed in the recess such that the end portion of the steel
beam, the shear reinforcement, and the auxiliary reinforcement or the main reinforcement
25 of the reinforced concrete column is embedded in the recess.
41
5. A joint structure of a reinforced concrete column and a steel beam,
wherein an end portion of a steel beam is inserted into a recess formed in a
reinforced concrete column,
wherein a first shear reinforcement which is connected to the steel beam and is
5 arranged in the recess and a second shear reinforcement of the reinforced concrete
column which protrudes toward the recess are connected to each other using a coupling
member,
wherein a concrete is placed in the recess, and the end portion of the steel beam,
the first shear reinforcement, the second shear reinforcement, and the coupling member
10 are embedded in the concrete, and
wherein the coupling member is a tubular body which is provided to surround
outer circumferences of the first shear reinforcement and the second shear reinforcement
arranged in the recess and is crimped to each of the first shear reinforcement and the
second shear reinforcement.
15 6. A joint structure of a reinforced concrete column and a steel beam,
wherein, in a joint of the reinforced concrete column and the steel beam, a shear
reinforcement of the reinforced concrete column is configured of a first shear
reinforcement and a second shear reinforcement, and a tubular body in which the first
shear reinforcement is inserted from one end portion and the second shear reinforcement
20 is inserted from the other end portion is provided,
wherein the first shear reinforcement is inserted into a hole portion formed in the
steel beam,
wherein the second shear reinforcement is arranged between the first shear
reinforcements adjacent to each other around an axis of the reinforced concrete column,
25 and
42
wherein the tubular body is crimped to the first shear reinforcement and the
second shear reinforcement to surround outer circumferences of the first and second
shear reinforcements.
7. The joint structure of a reinforced concrete column and a steel beam
5 according to claim 6,
wherein the first shear reinforcement and the second shear reinforcement are
arranged such that tip portions of the first and second shear reinforcements abut on each
other inside the tubular body.
8. The joint structure of a reinforced concrete column and a steel beam
10 according to claim 6,
wherein the first shear reinforcement and the second shear reinforcement are
arranged to overlap each other inside the tubular body.
9. A method of joining a reinforced concrete column and a steel beam,
wherein, in a joint of the reinforced concrete column and the steel beam, a shear
15 reinforcement of the reinforced concrete column is configured of a first shear
reinforcement and a second shear reinforcement, and a tubular body in which the first
shear reinforcement is inserted from one end portion and the second shear reinforcement
is inserted from the other end portion is provided,
wherein the first shear reinforcement is inserted into the hole portion formed in
20 the steel beam, and
wherein the second shear reinforcement is arranged between the first shear
reinforcements adjacent to each other around an axis of the reinforced concrete column,
the method comprising:
a hole portion forming process of forming a hole portion in the steel beam;
25 a first shear reinforcement installation process of inserting the first shear
43
reinforcement into the hole portion;
a shear reinforcement tubular body insertion process of inserting the first shear
reinforcement into the tubular body from the one end portion and inserting the second
shear reinforcement into the tubular body from the other end portion; and
5 a crimping process of crimping the tubular body to the first shear reinforcement
and the second shear reinforcement to surround outer circumferences of the first and
second shear reinforcements.