International Journal of Research and Scientific Innovation (IJRSI) | Volume IV, Issue X, October 2017 | ISSN 2321–2705 

Effect of Shear Wall on Sesmic Behavior of Unsymmetrical Reinforced Concrete Structure

Gaikwad Ujwala Vithal
Master of Engineering – Civil Engineering (Structures), SCOE, Pune, Maharashtra, India

Abstract: – Shear wall are used in tall buildings as supporting element to resist earthquake loading. In order to enhance the ductility of the structural system the walls are connected together with lateral beams. Many researchers have investigated the behavior of shear walls using different methods. Analytical methods are one of the early techniques used in analysis of shear walls. During an earthquake, damage to building is largely caused by dynamic loads. Therefore, in order to design buildings resistant to earthquake, dynamic characteristics of building must be known. Generally asymmetric tall buildings may consist of any combination of structural forms, such as frames, shear walls, structural cores, and coupled shear walls. Lateral forces caused by wind, earthquake, and uneven settlement loads, in addition to the weight of structure and people living; create torsion in structure. In this study Response Spectrum method is used to analyse horizontally unsymmetrical structure. Aim of this study to decrease torsion using shear wall in structure. ETABS is computer software used to prove the point. Five different cases to analyse the structure i.e. four concentric shear walls at lift, shear wall parallel to X axis, shear wall parallel to Y axis, shear walls placed at exterior corners and two shear wall placed parallel to X axis and three parallel to Y axis. Different thicknesses of shear wall i.e. 150mm, 200mm, 300mm, and 400mmare used in all these cases. It has been observed that the torsion, drift and displacement in structure decreased by using concentric shear wall at corners. This study will be useful while positioning of shear wall in structure.

Keywords-Torsion; Concentric shear wall; Drift; Displacement; Positioning; Thickness.

I. INTRODUCTION

1.1 General

Reinforced concrete (RC) buildings often have vertical platelike RC walls called shear walls in addition to slabs, beams and columns. These walls generally start at foundation level and are continuous throughout the building height. Their thickness can be as low as 150mm, or as high as 400mm in high rise buildings. Shear walls are usually provided along both length and width of buildings. Shear walls are like vertically-oriented wide beams that carry earthquake loads downwards to the foundation.

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