DOI : 10.17577/IJERTCONV9IS15008
- Open Access
- Authors : Prathibha Reddy T
- Paper ID : IJERTCONV9IS15008
- Volume & Issue : NCRAEM – 2021 (Volume 09 – Issue 15)
- Published (First Online): 21-09-2021
- ISSN (Online) : 2278-0181
- Publisher Name : IJERT
- License:
This work is licensed under a Creative Commons Attribution 4.0 International License
Evaluation of Multi-Storey Building by Changing the Location of Shear Walls
Prathibha Reddy T
Civil Engineering Department,
Brindavan Groups of Institutions, Bangalore 560064, India
Abstract:- In this study the 15 storey building is considered with each storey height of 3m. These buildings are analysied and designed as per Indian Code of Practice for Seismic Resistant Design and for wind load calculation. For the buildings base supports are assumed to be fixed. The sections of structural elements like beams and columns are considered as square and rectangular shapes. Constant storey height is maintained for all storeys of the buildings are assumed to be constant including the ground storey. The buildings are modeled and analyzed using software ETAB Nonlinear V9.7.0.Seven different models are studied with and without shear wall at different position in the building.
In the present study an attempt has been made to check the performance of high rise building with shear wall at the different position with seismic zone IV. Both Elastic static analysis and dynamic analysis (ESA) are carried out to compare the results
Keywords: Shear walls, Evaltion, Locations, Muti-storey
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INTRODUCTION
A vertical plate like RC wall in reinforced concrete building, referred to as SHEAR WALL. Walls of the building are continuous throughout the height and usually start at foundation level. Shear walls acts a vertical oriented wide beams that carry earthquake loads downward to the foundation. Shear walls are provided along both length & width of building. Most RC building has columns with shear walls. These columns & shear walls carry lateral loads & gravity load respectively. Shear walls offer high
strength & stiffness to building in the direction of their orientation, that
considerably reduces damage to structure and its contents and thereby reduces lateral sway of the building. Shear wall buildings are typically regular in elevation and in plan. As a part of an earthquake resistant building design, under the earthquake load the lateral displacement is decreased by inserting the walls in building plans and shear wall structure can be obtained.
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RC SHEAR WALL IN BUILDING
Shear walls should give the required lateral strength to resist horizontal earthquake forces. Shear walls are strong enough to transfer the horizontal forces to the other element in the load path under them. These other elements in the load path may be slabs, floors, foundation walls or footings.
Shear walls additionally give lateral stiffness to protect the floor or roof above from excessive side-sway. Shear walls are stiff enough to prevent the roof and floor framing members from sliding off their supports. Sufficiently stiff buildings typically suffer less non-structural harms.
RC shear walls gives great strength and stiffness to buildings within the direction of their orientation, that considerably
reduces lateral sway of the building and therefore it decrease the structure damages. Due to the large horizontal force of earthquake on shear wall, the effect of overturning on shear wall will also be large. Therefore shear walls in buildings should be located symmetrically in plan to reduce ill-effects of twist in buildings. They can be placed symmetrically along both the directions of plan.
Fig 1. RC Shear Wall in Building
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SEISMIC BEHAVIOUR OF SHEAR WALL
According to position of shear wall, the nature of stresses generation in the shear wall is different. Placing the shear wall at very near to the Centre of stiffness behave as a Vertical bending element and also the shear wall placing at corner of the building are can be in axial tension or in axial compression followed by the Lateral Force direction.
The drift generated is more compare to shear walls placed at the corner of the building. Thats why it is important and necessary to consider the correct or optimum location of the shear walls in the structure that may helps to reduce the stresses in all the structural members of the structure.
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METHODOLOGY
In this study the 15 storey building is considered with each storey height of 3m. These buildings are analysied and designed as per Indian Code of Practice for Seismic Resistant Design and for wind load calculation. For the buildings base supports are assumed to be fixed. The sections of structural elements like beams and columns are considered as square and rectangular shapes. Constant storey height is maintained for all storeys of the buildings are assumed to be constant including the ground storey. The buildings are modeled and analyzed
using software ETAB Nonlinear V9.7.0.four different models are studied with and without shear wall at different position in the building.
-
Model Details
Consider RC frame shear wall building of 15 stories with and without shear wall at different position for regular and irregular structure. Total of 4 models are considered for analysis: Model 1: Regular building without shear wall Model 2: Regular building with shear wall at position 1 (corners)
Model 3: Regular building with shear wall at position 2 Model 4: Regular building with shear wall at position 3 (centre)
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Material Properties
-Modulus of elascity ,
-Modulus of elascity for M30 27386 N/mm2
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Modulus of elascity for M25 – 25000 N/mm2
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Weight/unit volume of concrete – 25 kN/m3
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Mass/unit volume of concrete – 2.55 kN/m3
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Grade of steel Fe 415
Table.1 Grade of Concert
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Sizes of the Members
The details and the sizes of the members will be clarified clearly in the table below:
S.No
Specifications
Size
1
Dimensions for Plan
30 m x 30 m (X*Y)
2
Length along X- direction
30 m (6 Bays)
3
Length along Z- direction
30 m (6 Bays)
4
storey height
3.0 m
5
Plinth Level
1.7 m
6
Building height (G+15)
46.7 m
7
Thickness of Slab
150 mm
8
Beam dimensions
0.35 m x 0.45 m
9
Column dimension
0.35 m x 0.60 m
10
Shear wall size
150 mm
Table.2 Specification of members
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Figures of models
Fig.1.Model 1: Regular Building without Shear Wall
Fig.2.Model 2: Regular Building with Shear Wall at Position 1 (corners)
Fig.3.Model 3: Regular Building with Shear Wall at Position 2
Fig.4.Model 4: Regular Building with Shear Wall at Position 3 (center)
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-
RESULTS AND DISCUSSION
To study the response of lateral load effect on structure we used RC frame 15 storied regular and irregular building with shear wall at different location for seismic zone IV and wind load.
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
model
1(without
sw) model
(corner)
model
1(without
sw) model
2(corner)
model
3(corner 2)
0
model
3(corner 2)
0
20
20
40
Displacements
40
Displacements
60
60
80
80
Storeys
Storeys
Lateral Storey Displacement for Building in X-Direction for Elastic Static Analysis (ESA):
Above fig shows displacement v/s no. of storeys for regular and irregular model having shear wall at different location along X-direction for seismic zone IV and wind load, analyse is carried out for Elastic Static Analysis (ESA).From graph plotted indicates that:
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The maximum displacement along X-direction for regular structure without shear wall is 66.29mm
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The maximum displacement along X-direction for regular structure with shear wall at position 1 (corner) is 54.92mm
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The maximum displacement along X-direction for regular structure with shear wall at position 2 is 52.60mm
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The maximum displacement along X-direction for regular structure with shear wall at position at position 3 (centre) is 36.17mm
STOREY DISPLACEMENT (mm) RSA
STOR EYS
model 1
model 2
model 3
model 4
TERR ACE
47.5969
36.4151
34.9802
23.8291
STOR Y14
46.76
34.0971
32.831
22.1649
STOR Y13
45.5097
31.6835
30.5822
20.4273
STOR Y12
43.833
29.1922
28.2465
18.6476
STOR Y11
41.759
26.6211
25.8207
16.835
STOR Y10
39.3161
23.9787
23.3125
15.005
STOR Y9
36.529
21.2771
20.7334
13.1743
STOR Y8
33.4205
18.5325
18.0995
11.361
STOR Y7
30.0118
15.766
15.4321
9.5843
STOR Y6
26.3226
13.0074
12.7607
7.8653
STOR Y5
22.3703
10.2981
10.1268
6.2269
STOR Y4
18.1669
7.6956
7.5871
4.6942
STOR Y3
13.7242
5.277
5.2178
3.2958
STOR Y2
9.098
3.143
3.119
2.065
STOR Y1
4.5202
1.4223
1.4183
1.0381
GF
0.8109
0.4124
0.4708
0.4174
STOREY DISPLACEMENT (mm) RSA
STOR EYS
model 1
model 2
model 3
model 4
TERR ACE
47.5969
36.4151
34.9802
23.8291
STOR Y14
46.76
34.0971
32.831
22.1649
STOR Y13
45.5097
31.6835
30.5822
20.4273
STOR Y12
43.833
29.1922
28.2465
18.6476
STOR Y11
41.759
26.6211
25.8207
16.835
STOR Y10
39.3161
23.9787
23.3125
15.005
STOR Y9
36.529
21.2771
20.7334
13.1743
STOR Y8
33.4205
18.5325
18.0995
11.361
STOR Y7
30.0118
15.766
15.4321
9.5843
STOR Y6
26.3226
13.0074
12.7607
7.8653
STOR Y5
22.3703
10.2981
10.1268
6.2269
STOR Y4
18.1669
7.6956
7.5871
4.6942
STOR Y3
13.7242
5.277
5.2178
3.2958
STOR Y2
9.098
3.143
3.119
2.065
STOR Y1
4.5202
1.4223
1.4183
1.0381
GF
0.8109
0.4124
0.4708
0.4174
Lateral Storey Displacement for Building in X-direction for Response Spectrum Analysis (RSA)
STOREY DISPLACEMENT (mm) ESA
STOREYS
model 1
model 2
model 3
model 4
TERRACE
66.2879
54.9242
52.6011
36.1676
STORY14
64.8978
51.4099
49.3385
33.6024
STORY13
62.7989
47.7079
45.8852
30.9126
STORY12
59.9823
43.8372
42.2536
28.1465
STORY11
56.5244
39.794
38.4393
25.3202
STORY10
52.5177
35.6012
34.4637
22.4606
STORY9
48.0538
31.2975
30.3642
19.5986
STORY8
43.2183
26.9363
26.1925
16.7691
STORY7
38.0892
22.5834
22.0122
14.0099
STORY6
32.7371
18.3157
17.8983
11.3614
STORY5
27.2253
14.2213
13.9365
8.8662
STORY4
21.6121
10.3995
10.2239
6.5688
STORY3
15.9594
6.9619
6.8702
4.5153
STORY2
10.363
4.0351
4.001
2.755
STORY1
5.0666
1.7651
1.7621
1.3374
GF
0.8984
0.474
0.538
0.501
Storey Displacements Along X-Axis(ESA)
Storey Displacements Along X-Axis(ESA)
Storey Displacements Along X-Axis(RSA)
Storey Displacements Along X-Axis(RSA)
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
6
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
model
3(corner 2)
0
model
3(corner 2)
0
Displacements(mm)
Displacements(mm)
20 40 60
20 40 60
Storeys
Storeys
Above Fig shows displacement v/s no. of storeys for regular and irregular model having shear wall at different location along X-direction for seismic zone IV and wind load, analyse is carried out for Response Spectrum Analysis (RSA).From graph plotted indicates that:
-
The maximum displacement along X-direction for regular structure without shear wall is 47.60mm
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The maximum displacement along X-direction for regular structure with shear wall at position 1 (corner) is 36.42mm
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The maximum displacement along X-direction for regular structure with shear wall at position 2 is 34.98mm
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The maximum displacement along X-direction for regular structure with shear wall at position at position 3 (centre) is 23.83mm
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REFERENCES
model
1(without sw)
model 2(corner)
model
1(without sw)
model 2(corner)
-
BurucBurak and HakkiGurhanComlekoglu (2013) ,Effect of Shear Wall Area to Floor Area Ratio on the Seismic Behavior of Reinforced Concrete Buildings., Journal of Structural Engineering © ASCE,Volume139, ISSN: 0733-9445.
-
Ahmet Tuken and Nadeem A. Siddiqui (2012) ,Assessment of ShearWall Quantity in Seismic-Resistant Design of Reinforced Concrete Buildings Department of Civil Engineering, King Saud University,springer
-
IlkerFatih Kara and Cengiz Dundar (2009) ,Prediction of deflection of reinforced concrete shear walls ,ELESVIER.
-
Hyun-Su Kima , Dong-Guen Lee and Chee KyeongKimb (2005)
,Efficient Three-Dimensional Seismic Analysis of a High-Rise Building Structure with Shear walls,Engineering Structure, ELESVIER.
-
Adrián Beko, Peter Rosko, Helmut Wenzel, Pierre Pegon, Damijan Markovic and Francisco Javier Molina(30 July 2015), RC shear walls: Full-scale cyclic test, insights and derived analytical model, Engineering Structure, ELESVIER.
-
Jinhan Kwon and Wassim M. Ghannoum (2016) , Assessment of international standard provisions on stiffness of reinforced concrete moment frame and shear wall buildings Engineering Structure, ELESVIER.
-
Farid Chalah, Lila Chalah-Rezguia ,KamelFaleka , Salah Eddine Djellaba and Abderrahim Bali(2014) , Fundamental Vibration Period of SW Buildings,Science Direct, ELESVIER.
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P.V. Sumanth Chowdary and Senthil Pandian. M (2014) , A Comparative Study on RCC Structure with and without Shear wall, International Journal for Scientific Research & Development (IJSRD) , Vol. 2, ISSN : 2321-0613.
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Prof. Jayasree Ramanujan, Mrs. Bindu Sunil , Dr. LajuKottalliland Prof. Mercy Joseph Poweth (2014) , Effect of Shear Wall Location in Buildings Subjected to Seismic Loads, ISOI Journal of Engineering and Computer science,Volume 1 Issue 1; Page No. 07-17.
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N. Janardhana Reddy, D. GosePeera and T. Anil Kumar Reddy(2015)
,Seismic Analysis of Multi-Storied Building with Shear Walls Using ETABS-2013 International Journal of Science and Research (IJSR), Volume 4, ISSN: 2319-7064.
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CONCLUSIONS
-
Shearwall affects the stiffness of the
structure , walls increase the strength to the structure to resists the lateral forces by increasing the performance of the structure.
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Storey displacement, has been reduced for all structures with shear walls in the middle as compared to corner for regular structure.
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The maximum lateral storey displacement exists at the terrace level for all types of structures.