Seismic Analysis of Building Structure Having L-Shaped Shear Wall

Abstract

The addition of shear wall is a type of global retrofitting. The shear wall offers great resist to lateral loads. The response spectrum is used in this study. It improves the structural performance of building subjected to lateral forces due to earthquake excitation. The paper deals with the investigation of building frame with L-shape shear wall placed at different location such as center and diagonally. The result show that center location is performing better as compared to other cases. The reference model shows maximum displacement.

Introduction

I. INTRODUCTION

A. General Detail of Shear Wall

A shear wall is a structural component used in multistory or tall buildings, as well as ordinary buildings, in high wind areas. These walls typically begin at the foundation level and run the length and width of the building. In tall buildings, their thickness can be above 150 mm or below 400 mm, and they act as vertically oriented wide beams that carry the earthquake load towards the foundation. Reinforced concrete walls and reinforced concrete slabs make up an RC wall. Their wall thicknesses range from 140 mm to 500 mm, depending on the age of the building and the amount of thermal insulation required. Typically, these walls remain at the entire building's height; however, some walls are closed to the road front or basement level to allow for industrial or parking areas. Plywood is the most common material used in the construction of shear walls. Because of the advancement of prefabricated shear panels, these walls now reinforce small shear assemblies that fall on both sides of the opening.

B. Different Methods of Seismic Analysis 

The selection of seismic analysis method type to analyze the structure depend upon the external action, the behavior of structural material and type of structural modal selected. In bureau of Indian Standards, these four methods of analysis are defined i.e., Linear Static Analysis, Linear Dynamic Analysis, Non- Linear static analysis & non-Linear dynamic analysis.

II. LITERATURE SURVEY

The following are the literature study for RCC building having shear walls & bracing -

1. Naresh and Mood (2019) [14] investigated the seismic performance of a multi-story R.C. framed structure with a shear wall. The seismic performance of R.C. framed buildings of 6, 12, 24, and 36 stories was evaluated using the ETAB program's elastic and inelastic analyses. Eight models with a plan area of 30 m X 20 m and a height of 3 m were created for each type of storey.
2. Ashok Kankuntla (2016) [19] used finite element modelling to investigate the behaviour of a shear wall with an opening under seismic load action on member forces. As a result, the current study compares the seismic performance of a 15-story building with openings in the shear wall in earthquake zone V. For seismic analysis, the seismic coefficient method and the response spectrum method are used. The SAP software is used, and the outcomes are compared. The position of the shear wall is determined for all building models by changing the sizes and shapes of the openings in the shear wall.
3. Maikesh Chouhan (2016) [20] put his classroom knowledge to use by designing a multi-story residential building. In multi-story buildings, shear walls are more effective at resisting lateral loads. Steel and reinforced concrete shear walls are kept in major positions of multi-story buildings that are designed to withstand seismic and wind forces. Shear walls are very powerful structural elements that, when used properly, can significantly reduce deflections and stresses.

III. METHODOLOGY & ANALYSIS

The research work on the varying location of L-shear wall in building frame using ETABS software. Response spectrum analysis is used in this study. The loads measured are taken in accordance with the IS-875 (Part1 & Part2), IS-1893:2002/2016. In this study, the effect of shear wall in the building under seismic loading is been analyzed carried by Seismic Zone-V using ETABS software.

IV. DESIGN CASES OF STRUCTURAL FRAME

The built-up area of asymmetry building considered here are taken equal for all different cases. The building is of size i.e., 3700 mm X 1680 mm with a height of (G+10) Storey. The floor-to-floor height is taken as 4000 mm for all the structures and also the section properties is also common for all case frame structures. The following below is the Case Study to be analyzed and designed in this thesis-

Table 1 Research Work on Cases

The data of structure utilized in the work in the form of tabulation considered for design and analysis of frame are given below-

Table 2 Structural Properties

Conclusion

The reference model RM shows maximum displacement i.e., 35.02 mm and the model LSW1 case shows minimum displacement i.e., 22.56 mm. The reference model has displacement 35.57 % more than LSW1 case. This concludes that L-shape shear wall provided at the center and corner i.e., LSW1 and LSW2 are the best suitable location for the building in the study. It is suggested that to provide shear walls at the corner or at the center and for C-shape shear, it is suitable to provide it in center only.

References

[1] Kankuntla, P. Sangave, and R. Chavan, “Effects of openings in shear wall,” IOSR J. Mech. Civ. Eng., vol. 13, no. 1, pp. 1–6, 2016. [2] M. Chouhan and R. K. Makode, “Dynamic Analysis of Multi-Storeyed Frame-Shear Wall Building Considering SSI,” Int. J. Eng. Res. Appl., vol. 6, no. 8, pp. 31–35, 2016. [3] M. Naresh, P. M. Swaraj, V. Sandeep, and M. Vijayakumar, “Seismic Analysis of Reinforce Concrete Frames Building for Different Position of Shear Walls (Using Etabs Software)”. [4] IS: 875 (Part I) – 1987, “Code of Practice for Design Loads (Other than Earthquake) For Buildings and Structures”, Part 1 Dead Loads - Unit Weights of Building Materials and Stored Materials, Second Revision, September 2003. [5] IS: 875 (Part 2) – 1987, “Code of Practice for Design Loads (Other Than Earthquake) For Buildings And Structures”, Part 2 Imposed Loads, Second Revision and June 1998. [6] IS 1893 (Part 1):2002/2016, “Criteria for Earthquake Resistant Design of Structures”, Part 1 General Provisions and Buildings, New Delhi. [7] IS 1893 (Part 1): 2016, “Criteria for Earthquake Resistant Design of Structures”, Part 1 General Provisions and Buildings, New Delhi.

Copyright

Copyright © 2022 Kumar Gandharv, Dolendra Patel. 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.