Seismic Analysis of RC Framed Building for Different Position of Shear wall | Open Access Journals

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Seismic Analysis of RC Framed Building for Different Position of Shear wall

Anil Baral1, Dr. SK.Yajdani2
  1. P.G. Student, Department of Civil Engineering, A.U. College of Engineering (A), Visakhapatnam, Andhra Pradesh, India
  2. Assistant Professor, Department of Civil Engineering, A.U. College of Engineering (A), Visakhapatnam, Andhra Pradesh, India
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Abstract

Shear walls are incorporated in building to resist lateral Forces and support the gravity loads. RC shear wall has high in plane stiffness. Positioning of shear wall has influence on the overall behaviour of the building. For effective and efficient performance of building it is essential to position shear wall in an ideal location. This paper presents the response of building with different positioning of shear wall using both Equivalent Static Method (Seismic Coefficient Method) and Response spectrum Analysis. Five different Model of RCC building, one with no shear wall and other four models with different position of shear wall which is subjected to earthquake load in zone V has been studied .This study also incorporates how the bending moment, shear force for beam and axial Force for column vary with change in positioning of RC shear wall. Building are modelled and analysed using standard package ETABS 2013.

Keywords

Shear wall, Equivalent Static Method, Response spectrum Method, Storey Drift

INTRODUCTION

Reinforced concrete building can adequately resist both horizontal and vertical load. Whenever there is requirement for a multistorey building to resist higher value of seismic forces, lateral load resisting system such as shear wall should be introduced in a building. Vertical plate like RC wall introduced in building in addition to beam, column and slab are called shear wall. Shear wall can be provided both along the length and width of the building. Properly designed building with shear wall has shown good performance in past earthquake.Mark Finlet, a noted consulting engineer in USA stated that “We cannot afford to build concrete buildings meant to resist severe earthquakes without shear walls.” Different positioning of shear wall in building produces varying response in the building during application of lateral force. Anshuman et al (1) performed both linear and nonlinear analysis of 15 storey multistorey buildingwith 11 bays in longitudinal direction and 3 bays in transverse direction using both STAAD pro 2004 and SAP V 10.0.5 software for different positioning of shear wall in building. The building provided with shear wall in 6th&7th frame and 1st and 12th frame in shorter direction showed deflection with in permissible limit. Both bending moment and shear force were reduced in 1st and 12th frame after introduction of shear wall in building.
Effect of change in shear wall location on storey drift of multistorey building subjected to lateral load was performed by Ashish S. Agrawal et al(2). The study of 25 storey building in zone V is presented with some preliminary investigation which is analysed by changing various position of shear wall to determine parameter like Storey drift, axial load and displacement. This analysis is done by using ETAB. It was observed that placing shear wall away from the centre of gravity resulted in increase in most of member forces. The drift is increased as the height of the building is increased and reduced for the top floor. Location of shear wall had effect on dynamic and axial load of the column. VikasGovalkaret al (3) studied the behaviour of bare frame and infilled Frame with different positioning of shear wall. The effectiveness of shear wall has been studied by eight models. Four bare frame model and four infilled models with different position of shear wall were considered. The analysis was performed using STAAD pro V8i. Infilled model was found to be more economical and superior compared to bare Frame model. Axial force was significantly reduced using the shear wall. Few literature review [P.P.Chandukar et al. (2013), VermaS.K. et al. (2014), ShahzadJamilSardar et al. (2013),Varsha R. Harne(2014)] are available which discuss the positioning of shear wall. However more intense research is required for fixing the ideal location of shear wall in multistorey building. Hence this paper presents the analysis of 10 storey building with different position of shear wall using both equivalent static and Response spectrum method.

II. BUILDING MODELLING AND ANALYSIS

For analysis, G+ 9 storeys and plan area is 17*17 m which is located in Zone V is considered. The storey height is 3m in all the floor including the ground Floor. There are 5 bays in building in both X and Y direction. M25 grade concrete and Fe415 structural steel is used. Building is fixed at the base. All the properties of Building are mentioned below: Size of Beam in all Direction: 300*600 mm
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Modal Mass participation Factor is found to be higher for model 1 in 1st mode. For 2nd and 3rd mode modal mass participation Factor was higher in case of Model 3. 3.3 Lateral Displacement: Lateral Displacement of top storey of different model for various Load combinations using Static and Response Spectrum Analysis is shown in table below:
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Lateral displacement is Maximum For Model 1 and Minimum for Model 3 in both static and response spectrum method. Static method of analysis gave higher value of lateral displacement in all the 10 storey model as compared to Response spectrum Method of analysis.

3.4 STOREY DRIFT:

Storey drift is displacement of one level relative to other level above or below. The storey drift of all the five model in X and Y direction using static and RSM is shown in figure below:
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The Storey Drift is minimum in model 3 as compared to other model. Maximum Storey Drift occurred in model 1 which is frame structure with no shear wall. For all the 10 storey Models analysed, storey drift calculated using static method gave higher value of Drift than Response spectrum Analysis.

3.5 BENDING MOMENT AND SHEAR FORCE IN BEAM:

This project also studies the behavior of beam in all the model to find out effect of changing the position of shear wall in bending moment and shear forces. Beam B36, B37, B38, B39, B40 are considered in X- direction and Beam B6, B7, B8, B9. B10 are considered in Y direction for storey 9 as shown in figure1 and figure7. The values of bending moment and shear force shown in the table are for the maximum and minimum values obtained from all the load combination.
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3.6 AXIAL FORCE IN COLUMN:

.To understand the behavior of column due to change in position of shear wall axial force for column in different model are studied. The values of axial force shown in the table are for the maximum value obtained from all the Load combination. The values are shown for C13 column.
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IV. CONCLUSION

1. Fundamental Period of vibration was lower For Model 3 having shear wall along the corner edges and higher time period was observed in model 1 having no shear wall in building.
2. From both Equivalent Static analysis and Response Spectrum analysis displacement was higher in case of model 1 and lower in case of Model 3.Static analysis yield higher Value of displacement compared to RSA for all the five Models analysed
3. Storey drift is highly influenced by the presence of shear wall in the building. Model 3 showed Lower value of storey Drift in comparison to other models. The value of Storey drift obtained for Static analysis was found to be more than the storey Drift obtained From Response spectrum analysis For all the models of 10 storey Building.
4. Shear wall highly influence the forces acting in the Structural member. Higher values of Bending moment and shear force was observed in model 3 for the beams in storey 9 as compared to all other Models. Minimum value of axial force was observed in model3 for C13 column in all the storey of the building compared to other models.
Proper positioning of shear wall results in effective and efficient performance of building during earthquakes. Among the five models studied here model 3 having shear wall along the four corners displayed better result compared to other models.

NOTATION:

RC Reinforced Concrete
RSM Response Spectrum Method
RCC Reinforced cement concrete

References

[1] Anshuman. S, DipenduBhunia, BhavinRamjiyani (2011), “Solution of Shear Wall Location in Multi-Storey Building.” (IJCSE) Volume 2, No 2, pp.493-506.,Nov- 2011

[2] AshishS. Agrawal, S.D. charkha.”Effect of Change in shear wall location on storey drift of multistorey building subjected to Lateral Load.”(IJERA)www.ijera.comvol .2, Issue 3 , pp1789-1793,May-Jun 2012

[3] VikasGovalkar,P.J.Salunke, N.G.Gore,”Analysis of Bare Frame and Infilled Frame with Different position of Shear wall.”(IJRTE) ISSN:2277-3878,volume 3 Issue -3 ,pp. 67-72,July 2014.

[4] P. P. Chandurkar and Dr. P. S. Pajgade (2013), “Seismic Analysis of RCC Building with and Without Shear Wall.”(IJMER), .2. 3, Issue. 3, pp-1805-1810, ISSN: 2249-6645,May - June 2013

[5] VarshaR.Harne(2014)”Comparative Study of Strength of Rc Shear wall at Different Location on Multi-storied Residential Building”Inernational Journal of civil EngineeringResearch,ISSN2278-3652 Volume 5,Number 4, pp. 391-400, 2014.

[6] Shahzadjamilsardar and Umesh. N. Karadi,”Effect of Change in shear wall location on storey drift of multistorey building subjected to Lateral Load” International Journal of Innovative Research in science, Engineering and Technology.vol. 2,Issue 9, September 2013.

[7] Verma S.K., RoshanLal, Raman Kumar, “Seismic Response of Rc Framed Building.”(IJCSE) volume 4,No 4, 2014 ISSN 0979-4399

[8] ManishShrikhande, PankajAgrawal.”Earthquake Resistant Design of Structures.” PHI Learning Private Limited New Delhi,2010.

[9] IS 1893(part 1) : 2002, “ Criteria for earthquake resistant design of structures, part 1, general provisions and buildings “, Fifth revision, Bureau of Indian Standerds, ManakBhavan, Bahadur Shah ZafarMarg, New Delhi 110002

[10] P.C. Varghese,”Advance Reinforce Concrete Design.”PHI Learning Private Limited New Delhi. pp. 337-356,2012.