The Seismic Analysis of Multi Storied Building with Shear Walls of Different Shapes in all Zones

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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.

  1. 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,

    1. U Section

    2. W Section

    3. H Section

    4. T Section

  2. 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.

  3. OBJECTIVES

    • 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).

  4. BUILDING MODELS WITH SHEAR WALLS

    1. 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

    2. 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

    3. 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

    4. 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

    5. 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.

      • Dead load

        Dead load intensity is = 1.5 kN/m2

      • Live load

        Live Load Intensity is = 4kN/m2

      • Wall weight

        Wall weight is = 13.8 kN/m

    6. 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

  5. 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

    1. 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

    2. 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

    3. 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).

  6. 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.

    • 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.

    • G+14 building with H shaped shear wall is good in terms of the storey drift (Y direction) in zone V and III.

    • G+14 building with T shaped shear wall is good in

      terms of the base shear (Y direction) in zone and III.

    • In overall H-shape and W-shape shear walls are shows better performance in drift, displacement and shear.

    • There is no change in better shape of shear wall in both zones.

  7. FUTURE SCOPE

  • 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.

  • 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

  1. 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.

  2. 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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  3. T. Anil Kumar Reddy et (2014), Seismic Analysis of Multi- Storied Building with Shear Walls Using ETABS-2013. International Journal of Science and Research (IJSR),volume 1,2013.

  4. 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.

  5. 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

  6. Abhay Guleria et (2014), Structural Analysis of a Multi- Storeyed Building using ETABS for different Plan Configurations. International Journal of Engineering Research & Technology (IJERT)ISSN: 2278-0181,Vol. 3 Issue 5, May 2014

  7. 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

  8. Anshuman. S, Dipendu Bhuia, Bhavin Ramjiyani,Solution of shear wall location in multistory building, International journal of civil and structural engineering, 2011.

  9. Alfa Rasikan, M G Rajendrann,Wind behavior of buildings with and without shear wall, International Journal of Engineering Research and Applications. Vol. 3, Issue 2, pp. 480-485, 2013.

  10. Himalee Rahangdale, S.R.Satonee,Design and analysis of multi- storied building with effect of shear wall, International journal of engineering research and application", Vol. 3, Issue 3, pp. 223- 232, 2013.

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

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