DOI : 10.17577/IJERTV8IS070338
- Open Access
- Total Downloads : 79
- Authors : Donthireddy Raja Shekar Reddy , Joshi Sreenivasa Prasad
- Paper ID : IJERTV8IS070338
- Volume & Issue : Volume 08, Issue 07 (July 2019)
- Published (First Online): 30-07-2019
- ISSN (Online) : 2278-0181
- Publisher Name : IJERT
- License:
This work is licensed under a Creative Commons Attribution 4.0 International License
The Seismic Analysis of Multi Storied Building with Shear Walls of Different Shapes in all Zones
Donthireddy Raja Shekar Reddy1 M.Tech (Structural Engineering) Anurag Group of Institutions Hyderabad.
Joshi Sreenivasa Prasad2
M.Tech (Structural Engineering), (PhD) Anurag Group of Institutions Hyderabad
ISTE, ICACI, ICI
Abstract: A shear wall is a wall that used to resist the shear, produce due to lateral forces. Shear walls are added to that Building interior to provide more strength, stiffness to building when the exterior walls cannot provide sufficient strength and stiffness. It is necessary to find out that effective shape of shear wall. These present work deals with a study on improvement of shape of shear walls in symmetrical high rise building. In symmetrical buildings, center of gravity and center of rigidity coincide, so that shear walls are placed symmetrically. In these work a high rise building with different shapes of shear walls is considered for analysis. The multi store building with G+14 storeys are analyzed for storey drift story displacement and base shear using ETABS software. For the analysis of these building for seismic loading with all Zones (Zone-II, III, and IV & V) is considered. The analysis of these building is done by using dynamic method (Response spectrum analysis). The useful of shear walls in the structural planning of multistory buildings has long been recognized. When walls are situated in the advantageous positions in a building, they can be the very efficient in resisting lateral loads originating from wind or earthquakes etc. Reinforced concrete framed buildings are adequate for the resisting both vertical and horizontal loads acting on them of buildings. Extensive research has been done in the design and analysis of shear wall in high-rise buildings. However, significance of shear wall in high-rise irregular or unsymmetrical structures is not much discussed in literature.
Keywords: Shear wall, ETABS,
I.INTRODUCTION
Adequate stiffness is to ensured in high rise buildings for resistance to lateral loads induced by wind or seismic events. Reinforced concrete shear walls are designed for buildings located in the seismic areas, because of their high bearing capacity, high ductility and rigidity etc. In high rise buildings, beam and column dimensions work out large and heavy reinforcement at the beam-column joins are quite heavy, so that, there is lot of clogging at these joints, it is difficult to place and vibrate concrete at these places which does not contribute to the safety of the buildings. These practical difficulties call for the introduction of shear walls in High rise buildings. Buildings engineered with structural walls are almost always stiffer and then framed structures, reducing the possibility of the excessive deformation and hence damage. RC multi storied buildings are adequate for the resisting both the vertical and horizontal load.
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DIFFERENT SHAPES OF SHEAR WALLS
The shape and location of the shear wall have significant effect on the structural behavior under lateral loads. Lateral loads are distributed through the structure acting as the horizontal diaphragm, to the shear walls, parallel to the force of the action. The core eccentrically located with respect to the building shapes has to carry out torsion as well as bending and direct shear. These shear wall resist horizontal forces because their high rigidity as deep beams, reacting to shear and flexure against the overturning. The Shear Wall shapes used in this work are,
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U Section
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W Section
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H Section
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T Section
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MODELLING OF BUILDING
Here the study is carried out for the behavior of G+14 and building with shear walls of four different shapes in all zones. The general software ETABS has been used for the modeling. It is more user friendly and versatile program that offers the wide scope of the features like static and dynamic analysis, non- linear dynamic analysis and non- linear static pushover analysis, etc.
Building Plan And Dimension Details Table below shows the details of building.
-
OBJECTIVES
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To analyse the seismic behaviour of the symmetrical multistoried building(G+14) with shear walls of different shapes using dynamic analysis.
-
To find the effective shape of the shear wall and
to compare the seismic analysis of the multi storied building with shear wall in two different zone(zone II, zone III, zone IV, and zone V).
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BUILDING MODELS WITH SHEAR WALLS
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The Symmetrical Rc Building With H Shaped Shear Wall
The figure below shows the model of an I shaped RC symmetrical building with the H shaped shear wall.
Figure 1: Plan view of building with H shaped shear wall
Figure 2: 3D view of building with H shaped shear wall
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The Symmetrical Rc Building With T Shaped Shear Wall
The figure below shows the model of an I shaped RC symmetrical building with the T shaped shear wall.
Figure 3: Plan view of building with T shaped shear wall
Figure 4: 3D view of building with T shaped shear wall
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The Symmetrical Rc Building With W Shaped Shear Wall
The figure below shows the model of an I shaped RC symmetrical building with the W shaped shear wall.
Figure 5: Plan view of building with W shaped shear wall
Figure 6: 3D view of building with W shaped shear wall
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The Symmetrical Rc Building With U Shaped Shear Wall
The figure below shows the model of an I shaped RC symmetrical building with the U shaped shear wall.
Figure 7: Plan view of building with U shaped shear wall
Figure 8: 3D view of building with U shaped shear wall
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LOAD FORMULATION
In the present project works following loads are considered for the analysis. Dead Loads (IS- 875 PART 1) and Live Loads (IS 875 PART 2).
In addition to the above mentioned loads and dynamic loads in form of the Response Spectrum method are also be assigned.
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Dead load
Dead load intensity is = 1.5 kN/m2
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Live load
Live Load Intensity is = 4kN/m2
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Wall weight
Wall weight is = 13.8 kN/m
-
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ANALYSIS
The three dimensional reinforced concrete structures were analyzed by the Response Spectrum Analysis using ETABS software. It is a linear dynamic statistical analysis method to indicate the likely maximum seismic response of the elastic structure. The plot of the peak acceleration for the mixed vertical oscillators. A response spectrum is simply a plot of the peak and steady-state response (displacement, velocity or acceleration) of a series of oscillators of varying natural frequency that are forced into motion by the same base vibration or shock.The analysis results will show in the performance levels, behaviour of the structures.
ZONES
RSX
RSY
II
Displacement
6.546
8.808
Drift
0.000036
0.000101
Shear
4223
3463
III
Displacement
7.562
8.945
Drift
0.000052
0.000156
Shear
12555
11348
IV
Displacement
21.456
25.325
Drift
0.000105
0.000232
Shear
13656
12896
V
Displacement
22.564
30.562
Drift
0.000125
0.000356
Shear
24536
24138
ZONES
RSX
RSY
II
Displacement
6.546
8.808
Drift
0.000036
0.000101
Shear
4223
3463
III
Displacement
7.562
8.945
Drift
0.000052
0.000156
Shear
12555
11348
IV
Displacement
21.456
25.325
Drift
0.000105
0.000232
Shear
13656
12896
V
Displacement
22.564
30.562
Drift
0.000125
0.000356
Shear
24536
24138
Figure 9: Response sprectrum analysis using E-Tabs
Figure 10: Load cases
-
-
COMPARISON OF RESULTS
Table 3: W-Shaped shear wall Response Spectrum Values
ZONES
RSX
RSY
II
Displacement
6.509
8.321
Drift
0.000036
0.000116
Shear
4387
2349
III
Displacement
7.456
9.365
Drift
0.000052
0.000165
Shear
12632
10432
IV
Displacement
22.345
29.995
Drift
0.000078
0.000196
Shear
14106
12056
V
Displacement
23.564
30.567
Drift
0.000125
0.000356
Shear
26325
23548
Table 4: U-Shaped shear wall Response Spectrum Values
20
15
10
20
15
10
RSX
RSY
RSX
RSY
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STOREY DISPLACEMENT
H-Shape T-Shape W-Shape U-Shape
H-Shape T-Shape W-Shape U-Shape
5
0
5
0
Figure 9: Variation of the storey displacement for G+14 building with different shape of shear wall in (zone II).
20
ZONES
RSX
RSY
II
Displacement
7.715
8.740
Drift
0.000043
0.000116
Shear
7345
6326
III
Displacement
9.324
9.960
Drift
0.000145
0.000186
Shear
12325
9548
IV
Displacement
27.774
31.466
Drift
0.000236
0.000325
Shear
12651
10614
V
Displacement
28.765
33.456
Drift
0.000345
0.000425
Shear
26315
20358
ZONES
RSX
RSY
II
Displacement
7.715
8.740
Drift
0.000043
0.000116
Shear
7345
6326
III
Displacement
9.324
9.960
Drift
0.000145
0.000186
Shear
12325
9548
IV
Displacement
27.774
31.466
Drift
0.000236
0.000325
Shear
12651
10614
V
Displacement
28.765
33.456
Drift
0.000345
0.000425
Shear
26315
20358
Table 1: H-Shaped shear wall Response Spectrum Values
15
10
5
0
H-Shape T-Shape W-Shape U-Shape
ZONES
RSX
RSY
II
Displacement
14.421
15.548
Drift
0.000048
0.000103
Shear
5904
5123
III
Displacement
15.564
17.725
Drift
0.000078
0.000125
Shear
12545
12538
IV
Displacement
16.364
17.798
Drift
0.000185
0.000245
Shear
24325
24396
V
Displacement
17.065
18.965
Drift
0.000236
0.000258
Shear
26432
26456
ZONES
RSX
RSY
II
Displacement
14.421
15.548
Drift
0.000048
0.000103
Shear
5904
5123
III
Displacement
15.564
17.725
Drift
0.000078
0.000125
Shear
12545
12538
IV
Displacement
16.364
17.798
Drift
0.000185
0.000245
Shear
24325
24396
V
Displacement
17.065
18.965
Drift
0.000236
0.000258
Shear
26432
26456
RSX RSY
Table 2: T-Shaped shear wall Response Spectrum Values
Figure 10: Variation of the storey displacement for G+14 building with different shape of shear wall in (zone III).
35
30
25
20
15
10
5
0
RSX
RSY
0.00035
0.0003
0.00025
0.0002
0.00015
0.0001
0.00005
0
RSX
RSY
35
30
25
20
15
10
5
0
RSX
RSY
0.00035
0.0003
0.00025
0.0002
0.00015
0.0001
0.00005
0
RSX
RSY
H-Shape T-Shape W-Shape U-Shape
H-Shape T-Shape W-Shape U-Shape
40
30
20
40
30
20
RSX
RSY
RSX
RSY
Figure 11: Variation of the storey displacement for G+14 building with different shape of shear wall in (zone IV).
H-Shape T-Shape W-Shape U-Shape
H-Shape T-Shape W-Shape U-Shape
10
0
10
0
Figure 12: Variation of the storey displacement for G+14 building with different shape of shear wall in (zone V).
RSX
RSY
RSX
RSY
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STOREY DRIFT
Figure 15: Variation of the storey drift for G+14 building with different shape of shear wall in (zone IV).
0.0005
0.0004
0.0003
0.0002
0.0001
0
RSX
RSY
0.0005
0.0004
0.0003
0.0002
0.0001
0
RSX
RSY
Figure 16: Variation of the storey drift for G+14 building with different shape of shear wall in (zone V).
8000
6000
4000
8000
6000
4000
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STOREY SHEAR
0.00014
0.00012
0.0001
0.00008
0.00006
0.00004
0.00002
0
RSX RSY
H-Shape T-Shape W-Shape U-Shape
H-Shape T-Shape W-Shape U-Shape
2000
0
2000
0
Figure 13: Variation of the storey drift for G+14 building with different shape of shear wall in (zone II).
Figure 17: Variation of the storey Shear for G+14 building with different shape of shear wall in (zone II).
14000
12000
10000
8000
0.0002
0.00015
0.0001
0.00005
0.0002
0.00015
0.0001
0.00005
6000
4000
RSX
RSY
RSX
RSY
2000
0
RSX RSY
0
0
Figure 14: Variation of the storey drift for G+14 building with different shape of shear wall in (zone III).
Figure 18: Variation of the storey Shear for G+14 building with different shape of shear wall in (zone III).
30000
25000
20000
15000
10000
5000
0
RSX
RSY
30000
25000
20000
15000
10000
5000
0
RSX
RSY
Figure 19: Variation of the storey Shear for G+14 building with different shape of shear wall in (zone IV).
30000
25000
20000
15000
10000
5000
0
RSX
RSY
30000
25000
20000
15000
10000
5000
0
RSX
RSY
Figure 20: Variation of the storey Shear for G+14 building with different shape of shear wall in (zone V).
-
-
CONCLUSION
In the present study, an attempt is made to the study of seismic behavior of the building with shear walls of four different Shapes in all zones comparing. First part of the study included the dynamic analysis of Building. The storey drift, story displacement and base shear will be obtained and comparative table of these results for all the shapes of shear wall will be presented and also comparison of shapes of shear walls in different zones like zone-II, III, IV, V needs to be executed.
Graphical representation of the storey drift, storey displacement and base shear values are shown in figure. The results indicated that W and U shaped shear wall shows better performance than others based on the storey drift and base shear values. In Y direction H shape is better according to the storey drift and T shape is better according to base shear value. Graphical representation of storey drift, storey displacement and base shear values are shown in the figure. The results indicated that W and U shaped shear wall shows better performance than others based on the storey drift and base shear values. In Y direction H shape is better according to storey drift and T shape is better according to base shear value. Graphical representation of the storey drift, storey displacement and base shear values are shown in figure below. The results indicated that, in terms of storey drift W and H shaped shear wall is good in X and Y direction. According to base shear values T shaped shear wall is good in both the X and Y direction. Graphical representation of storey drift, storey displacement and base shear values are shown in the figure
below. The results indicated that, in terms of storey drift W and H shaped shear wall is good in the X and Y direction. According to base shear values T shaped shear wall is good in the both X and Y direction.
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On the basis of the storey drift, storey displacement and base shear value G+14 building with W and U shaped shear wall shows better
performance (X – direction) in both zone V and III.
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G+14 building with H shaped shear wall is good in terms of the storey drift (Y direction) in zone V and III.
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G+14 building with T shaped shear wall is good in
terms of the base shear (Y direction) in zone and III.
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In overall H-shape and W-shape shear walls are shows better performance in drift, displacement and shear.
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There is no change in better shape of shear wall in both zones.
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FUTURE SCOPE
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Further study can be carried out by the changing the position of shear wall.
-
This work can be extended to do the analysis for un-symmetrical buildings.
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This work also extended to do the push over analysis structures.This work also extended to do the analysis for changing of size, thickness.
REFERENCES
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Dr. E Arunakanth(2014), Optimum Location of Different Shapes of Shear Walls in Unsymmetrical High Rise Buildings. International Journal of Engineering Research & Technology (IJERT), Vol. 3 Issue 9, September- 2014.
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Dr. Laju Kottalil et al (2014) Effect of shear wall location in buildings subjected to seismic loads. IOSI Journal of engineering and computer science, Volume 1 Issue 1.
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Dr. P. S. Pajgade et (2013), Seismic Analysis of RCC Building with and Without Shear Wall. International Journal of Modern Engineering Research (IJMER) Vol. 3, Issue. 3, May – June 2013.
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P.Kalpana et (2016), Analysis Of Building With And With Out Shear Wall At Various Heights And Variation Of Zone III And Zone V. Int. Journal of Engineering Research and Application ISSN : 2248-9622, Vol. 6, Issue 12, ( Part -2) December 2016, pp.05-11
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M.Pavani, G.Nagesh Kumar et (2015), Shear Wall Analysis and Design Optimization In Case of High Rise Buildings Using Etabs. International Journal of Scientific & Engineering research, volume 6, issue 1, january-2015
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AUTHORS PROFILE
Donthireddy Raja Shekar Reddy M.Tech (Structural Engineering) Anurag Group of Institutions Hyderabad.
Joshi Sreenivasa Prasad
M.Tech (Structural Engineering), (PhD) Assistant Professor
Anurag Group of Institutions Hyderabad
ISTE, ICACI, ICI