Claims:WE CLAIM

1. A method for blast resistant analysis and design of reinforced cement concrete (RCC) multistorey building, the method comprising:
a) providing the minimum distance for a face where building is exposed to roads and based on the type of structure from IS: 4991-1968;
b) providing the safety room where the effect of explosion is minimum;
c) a communication means to inform the information of blast to all the floors in the building;
d) not providing the cellars for parking;
e) providing fire extinguishers and more number of exit entries for every floor of the building;
f) providing less wood works;
g) providing less ventilation to each room;
i) the structure ought to not hold those cantilever slabs;
j) structure ought to be given for colossal number of domes.

2. The method as claimed in claim 1, wherein shoot safe materials are plastered.

3. The method as claimed in claim 1, wherein the cement property which is utilized within the building structure is as per the standard IS456:2000.

4. The method as claimed in claim 1, wherein the tallness for each floor is taken as 3 m.

5. The method as claimed in claim 1, wherein the blast loads are decreased by providing lateral moment resisting frames like shear wall.
6. The method as claimed in claim 1, wherein the design of the multistorey RCC building is carried out using ETABS software as per IS 4991-1968.

7. The method as claimed in claim 1, wherein the analysis of the structure is carried out using two loading combinations separately as a) Dead load and Live load, b) Earthquake load, c) Wind load and d) Blast load.

Dated this the 04 th day of April 2022.

Anugu Vijaya Bhaskar Reddy,
Agent for the Applicant (IN/PA-2420)
, Description:4. DESCRIPTION

FIELD OF THE INVENTION

The present invention relates to the technical field of building construction. Specifically, the present invention relates to blast resistant analysis and design of RCC multistorey building.

BACKGROUND OF THE INVENTION

From the past years the terrorists are focusing on the buildings which are multi-storage and tall structures because as they have to kill vast number of people and they have to show their strategy and fear to the country and their weapon power. Due to increase in technology, the building in large cities are concentrated on the comfort of living and the safety against earthquake and wind loads but they are not concentrated on blast loads ,so that the framework is totally collapsed during the terrorist blast.

Explosives at dives through a fast substance response substantial amount about gasses results would framed for great temperature. The vitality freed toward the explosives produces the impacts for example, displacements, fragmentation, vibration What's more air impact. The explosives when explosion happens produces a secondary accelerated stun wave. These waves crack those dividers and produces interior anxiety over beams Furthermore columns What's more crushes the material Furthermore it will diminish those quality of the structure. Those cracks are loaded for the detonative gasses and the cracks are produced till those gas weight gets feeble.

Thus, there is a need to implement different techniques in planning during the construction and to design the building taking consideration of blast loads and to look after the building against any terrorist explosives and also to minimize the loss of the framework and loss of life.

SUMMARY OF THE INVENTION

The following presents a simplified summary of the disclosure in order to provide a basic understanding to the reader. This summary is not an extensive overview of the disclosure and it does not identify key or critical elements of the invention or delineate the scope of the invention. Its sole purpose is to present some concepts disclosed herein in a simplified form as a prelude to the more detailed description that is presented later.

One object of the invention is to provide blast resistant analysis and design of RCC multistorey building.

Another object of the invention is to provide a blast resistant RCC multistorey building.

Yet another object of the invention is to provide XXX.

According to one aspect of the invention, the present invention relates to a method for blast resistant analysis and design of reinforced cement concrete (RCC) multistorey building. the method comprises the steps of:
a) providing the minimum distance for a face where building is exposed to roads and based on the type of structure from IS: 4991-1968;
b) providing the safety room where the effect of explosion is minimum;
c) a communication means to inform the information of blast to all the floors in the building;
d) not providing the cellars for parking;
e) providing fire extinguishers and more number of exit entries for every floor of the building;
f) providing less wood works;
g) providing less ventilation to each room;
i) the structure ought to not hold those cantilever slabs;
j) structure ought to be given for colossal number of domes.

The invention may also relate to any alternative device or process comprising any combination of the above or below features within the scope of the claims.

BRIEF DESCRIPTION OF THE DRAWINGS

Other objects and advantages of the present invention will become apparent to those skilled in the art upon reading the following detailed description of the preferred embodiments, in conjunction with the accompanying drawings, wherein like reference numerals have been used to designate like elements, and wherein:

FIG. 1 illustrates top view of plan according to one embodiment of the invention.

FIG. 2 illustrates the blast forces acting in the direction of x from the face of the building according to one embodiment of the invention.

FIG. 3 illustrates total resultant displacement if the blast occurred on the face of x- direction according to one embodiment of the invention.

FIG. 4 illustrates Shear force if the blast occurred on the face of x- direction according to one embodiment of the invention.

FIG. 5 illustrates the blast forces acting in the direction of Y from the face of the building according to one embodiment of the invention.

FIG. 6 illustrates total resultant displacement if the blast occurred on the face of Y-direction according to one embodiment of the invention.

FIG. 7 illustrates shear force if the blast occurred on the face of Y- direction according to one embodiment of the invention.

FIG. 8 illustrates the blast forces acting in the negative direction of Y from the face of the building according to one embodiment of the invention.

FIG. 9 illustrates total resultant displacement if the blast occurred on the face of negative Y-direction according to one embodiment of the invention.

FIG. 10 illustrates shear force if the blast occurred on the face of negative Y- direction. according to one embodiment of the invention.

The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present invention in any way.

DETAILED DESCRIPTION OF THE INVENTION

It is to be understood that the present disclosure is not limited in its application to the details of composition set forth in the following description. The present disclosure is capable of other embodiments and of being practiced or of being carried out in various ways. Also, it is to be understood that the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting.

According to one embodiment of the invention, the present invention relates to blast resistant analysis and design of reinforced cement concrete (RCC) multistorey building.

Blast resistant design refers to improving structural integrity of structure instead of complete collapse of building, present study on G+7 residential building proves that increase in stiffness of structural members by increasing in size provide better results which also resist the uplift force on footings by increasing in dead weights. Effects of blast loads can also be decreased by providing lateral moment resisting frames like shear wall thereby decreasing the effect of lateral loads which also reduces damage and increase structural integrity of the building.

Explosives: Explosives dives through a fast substance response substantial amount about gasses results would framed for great temperature. The vitality freed toward the explosives produces the impacts for example, displacements, fragmentation, vibration and air impact. The explosives when explosion happens produces a secondary accelerated stun wave. These waves crack those dividers and produces interior anxiety over beams Furthermore columns What's more crushes the material Furthermore it will diminish those quality of the structure. Those cracks are loaded for the detonative gasses and the cracks are produced till those gas weight gets feeble.

Low explosives: At the speed for material may be less 200 to 300 ft for every second they would dealt with concerning illustration low explosives. Dark powder is one example of low explosives.

Helter skelter explosives: helter skelter explosives are admixture of chemicals hosting speed about 500feets for every second. Instance dynamite is one example of helter skelter explosives.

According to one embodiment of the invention, while planning the building maintaining the minimum distance for the face where building is exposed to roads and based on the type of structure from IS: 4991-1968 is essential. The safety room is provided where the effect of explosion is minimum and to provide the facility to inform the information of blast to all the floors in the building. The blast resistant building contains the less glazing on the exposure face of building to the road because when the blast wave with high speed causes the glass to break and to move the glass particle to larger distance and increase the loss of life.

According to one embodiment of the invention the cellars are not provided for parking because when the explosive material enters below the cellar portion creates an internal pressure below the slab and cause damage. The water tanks are provided at the exposure faces. Proper fire extinguishers and the more no of exit entries are provided for every floor. The building should contain less wood works because wood will catch easily fire. The room should contain less ventilation, where the exposure gases enters inside the buildings and increase the pressure inside the buildings and increase the loads of the buildings.

According to one embodiment of the invention, the structure ought to not hold those cantilever slabs since the point when those explosion happen beneath the slabs that produces those reflected waves and elevate the structure and makes harm of the associations in the structure. Those structure ought to be given for colossal number of domes. Also arches in view they didn't reflect the impact waves. The utilization from claiming fortified bond cement beams. Furthermore columns are favored when contrasted with steel areas. Those structure ought to a chance to be outline to vast quake for high back on account of the vibrations created toward those detonative may be short of what the configuration recurrence from claiming vibration of the fabricating afterward the structure won't influence because of that vibrations. Utilize secondary quality Furthermore shoot safe materials to plastering. The point when those blast occurs, those impact wave achieves the dividers.

It will be recognized that the above described subject matter may be embodied in other specific forms without departing from the scope or essential characteristics of the disclosure. Thus, it is understood that, the subject matter is not to be limited by the foregoing illustrative details, but it is rather to be defined by the appended claims.

Building data: According to one embodiment of the invention, the building data is as follows:
Beam : 0.45 m X 0.45 m
Column : 0.45 m X 0.45 m
Slab thickness : 120 mm
Materials : M30, Fe500
Shear wall thickness: 230 mm
Dead loads (IS 875 -Part 1) : 12 kN/m2 for outer walls.
: 6 kN/m2 for inner walls.
: 3 kN/m2 for parapet walls.
: 4 kN/m2 for floor load.
Live loads (IS 875- Part 2) : 3 kN/m2 on slab
Earthquake loads :( IS1893:2002(part 1)
Wind loads :(IS 875- Part 3)
Load combination:
1.5 (dead load +live load)
1.2 (dead load +live load)

Calculation of blast force for a 100 kg charge of explosive: According to one embodiment of the invention, the blast loads are calculated as follows:
Scaled distance (m) = Actual distance/ Charged weight in tons.
Actual distance is obtained from the code book IS4991:1968.
The corresponding values of Pro, Pso are taken from Table 1 of IS: 4991-1968. The source at a point is taken as (0, 1.5, 0).

Coordinates of point of intrest Distance between source and target slab
30 1.5 0 30 SLAB 1
30 1.5 4.11 30.21
30 1.5 7.75 30.98
30 4.5 0 30.14 SLAB 2
30 4.5 4.11 30.42
30 4.5 7.75 31.12
30 7.5 0 30.59 SLAB 3
30 7.5 4.11 30.86
30 7.5 7.75 31.56
30 10.5 0 31.32 SLAB 4
30 10.5 4.11 31.58
30 10.5 7.75 32.26
30 13.5 0 32.31 SLAB 5
30 13.5 4.11 33.57
30 13.5 7.75 33.22
30 16.5 0 33.54 SLAB 6
30 16.5 4.11 34.79
30 16.5 7.75 34.42
30 19.5 0 34.98 SLAB 7
30 19.5 4.11 35.22
30 19.5 7.75 3557

Table 1: Represents the distance between source and the target

Slab Scaled Distance Pro ( kg/cm2) Pro (KN/m2) A( m2) Force (KN )
SLAB1 65 0.87 77 2.7 207
65 0.80 77 2.7 207
67 0.75 73 2.1 153
SLAB2 65 0.79 77 2.7 207
66 0.77 75 2.7 202
67 0.75 73 2.1 153
SLAB3 66 0.77 75 2.7 202
67 0.75 73 2.7 197
68 0.71 69 2.1 144
SLAB4 68 0.71 69 2.7 186
68 0.71 69 2.7 186
70 0.69 67 2.1 140
SLAB5 70 0.69 67 2.7 180
71 0.69 67 2.7 180
72 0.67 65 2.1 136
SLAB6 72 0.67 65 2.7 175
73 0.65 63 2.7 170
74 0.64 62 2.1 130
SLAB7 76 0.60 58 2.7 156
76 0.60 58 2.7 156
77 0.59 57 2.1 119

Table 2: (Pro) Blast load on front face of the building.

FIG. 1 illustrates top view of plan according to one embodiment of the invention. As shown in FIG. 1, the encircled structure demonstrating is done for ETABS product. The cement property which is utilized within those structure is take from IS456:2000. The materials that are made similarly as M30 cement & Fe500 steel. The framework profundity is made similarly as 2 m from those ground surface. The tallness for each floor may be taken as 3 m. The downright tallness of the structure is 21 m from ground surface. The encircled components in the structure are beams and also columns. The shell item in the structure would slab, shear divider. The thickness of the dividers are taken Similarly as 45 cm.

FIG. 2 illustrates the blast forces acting in the direction of x from the face of the building according to one embodiment of the invention. Due to the action of the blast forces the maximum displacement is occurred at a storey 7 of 7.357 mm.

FIG. 3 illustrates total resultant displacement if the blast occurred on the face of x- direction according to one embodiment of the invention. The shear force is maximum at a footing of 6.5 kN.

FIG. 4 illustrates Shear force if the blast occurred on the face of x- direction according to one embodiment of the invention.

FIG. 5 illustrates the blast forces acting in the direction of Y from the face of the building according to one embodiment of the invention.

FIG. 6 illustrates total resultant displacement if the blast occurred on the face of Y-direction according to one embodiment of the invention. The shear force is maximum at a footing of -6.40 kN which is represented graphically in
the above figure.
FIG. 7 illustrates shear force if the blast occurred on the face of Y- direction according to one embodiment of the invention.

FIG. 8 illustrates the blast forces acting in the negative direction of Y from the face of the building according to one embodiment of the invention.

FIG. 9 illustrates total resultant displacement if the blast occurred on the face of negative Y-direction according to one embodiment of the invention. Due to the action of the blast forces the maximum displacement is occurred at a storey 7 of -17.18 mm.

FIG. 10 illustrates shear force if the blast occurred on the face of negative Y- direction. according to one embodiment of the invention. The shear force is maximum at a footing of 8 kN.
While specific embodiments of the invention have been shown and described in detail to illustrate the novel and inventive features of the invention, it is understood that the invention may be embodied otherwise without departing from such principles.