Study of Seismic Effect on High Rise Building in Two Different Position of Shear Wall using Staad Pro

Abstract

India at present is fast growing economy & Population growth will increase demands of land to construct high rise structure are more advantage to provide they demands in construction industry. The present study reports the effect of earthquake on high rise building to comparison of two different seismic zone with different position of shear wall using STAAD Pro. V8i SS5 to work out effective ideal location of shear walls. G+9 high rise building in zone III & zone V is considered for the present study. Analysis of the building is conferred with some preliminary investigations, analyzed by varied position of shear wall by considering three models as model 1 without shear wall, model 2 shear wall at corner with different position, model 3 shear wall in corner position. Maximum shear wall deflections are calculated and analyzed for all considered model. M30 grade of concrete is used with Fe415 steel is used for the present study. The seismic analysis performed is Equivalent Static Method as per IS 1893-2002 using the well-known analysis and design software STAAD PRO. V8i SS5 . Seismic performance of the building has been investigated based on parameters such as, Base Shear, Storey Displacements & Storey Drift along X direction & along Z direction of the structure.

Introduction

I. INTRODUCTION

Vibrations which are caused under the earth’s surface generate waves which disturb the earth surface, termed as earthquakes. It was said that earthquakes will not kill human but structures which are not constructed in considering the earthquake forces do. 60% of India lying in earthquake prone zone at which there is a need of increase of understanding the behaviour of earthquake, constructing and developing earthquake resistant structures. Shear walls to resist the lateral forces produced during earthquake. Shear walls behaviour depends upon the material used, wall thickness, wall length, wall positioning in building frame also. Shear wall is a structural member used to resist lateral forces that are designed to resist in-plane lateral forces, typically wind and seismic loads. It resists the loads due to Cantilever Action. In other words, Shear walls are vertical elements of the horizontal force resisting system. Lateral forces caused by wind, earthquake, and uneven settlement loads, in addition to the weight of structure and occupants, create powerful twisting forces. These forces can shear a building apart. Reinforcing a frame by attaching or placing a rigid wall inside it maintains the shape of the frame and prevents rotation at the joints.

Shear walls are especially important in high-rise buildings subject to lateral wind and seismic forces. They also provide adequate strength and stiffness to control lateral displacements. The shape and plan position of the shear wall influences the behavior of the structure considerably. Shear walls resist the effect of mainly two things, they are in-plane shear and in-plane bending action due to moment from shear. Though in addition to these, the shear wall, as a structural element, tends also to resist plane shear in the vertical direction and the buckling effect of dead loads coming from the top. According a shear wall may fail either in one of these two modes. The modes are flexural shear failure, horizontal shear failure and vertical shear failure.

A. Functions of Shear Wall

1. Resist Lateral loads, Seismic loads, Vertical Forces
2. Reduces lateral sway of the building
3. Provide large strength and stiffness to buildings in the direction of their orientation
4. The rigid vertical diaphragm transfers the loads into foundations
5. Provide large strength and stiffness in the direction of orientation
6. Well-distributed reinforcement
7. Minimize damages to structural and nonstructural elements

B. Location & Design Classification of The Shear Wall

The location of the shear wall depends on the; structure plan,core location ,building symmetry. The lateral force of the structure. The most common and useful practice of the shear wall is in the centre (lift section) or the perimeter of the building. But in this case the location of shear wall at corner with different position and corner two case. The location is decided after the complete structural analysis.

II. PROBLEM STATEMENT AND METHODOLOGY

Analysis of any structure for resisting earthquake is the basic need of this study. In this project analysis of a seismic resistant structure is a need of concern, and thereby establishing a comparison between structures with normal shear wall. In high rise structures most adoptable type to resist earthquake is to provide shear wall. Basically, many analysis and design software can be adopted to analyze and design any earthquake resistant structure. There are many methods for analysis and design such as equivalent static method (seismic coefficient method) and response spectrum method. Among all these methods in this study only equivalent static method is adopted. In this study Staad Pro is used for analysis. The proposed work is planned to be carried out in the following manner.

Conclusion

From the results and discussions following conclusions are made with respect to equivalent static method of analysis of RCC Framed structure with and without shear wall- 1) The base shear values are incrementing in zone V & shows highest base shear value for zone V 2) The maximum time period obtained is 0.675sec for model 1, model 2 and model 3. Hence, from this analysis stiffer zones III and V. 3) The storey displacement at the top storey is more in zone III and zone V. 4) Models with shear wall shows reduction in displacement, there by models-2 and model-3. 5) The storey displacement in the shear wall model 3 is less than model-1 and model-2.. 6) The storey displacement is increased gradually from bottom to top storey for all model. 7) The storey drift is gradually reduced in model 2. Considering the construction time factor with shear wall structure need more time to execution however proper workmanship needs to be followed for better structural behavior.

References

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Copyright

Copyright © 2023 Rakesh Grover, Bhavesh Kumar Daharwal. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.