JSTE_V5_N3_RP6 Gitarani Purohit A. Mallika Journal on Structural Engineering 2320 - 2343 5 3 40 53 Steel Plate Shear Wall, Tension Field, Perforations, Linear Time History, Modal Analysis Steel Plate Shear Walls (SPSW) can be used as an effective lateral load resisting system, both in new constructions as well as for retrofitting purpose in highly seismic zones. Many of the experimental and numerical investigations on SPSWs have supported the logic of using the post buckling strength with formation of tension fields, good ductility, and high energy dissipating capability when subjected to cyclic loading. In the present paper, Ritz modal analysis and linear dynamic analysis were performed using El Centro, Cape Mendocino & Northridge Earthquakes Ground motion data as inputs to FE Models of a series of perforated single-storey, double-storey & four-storey SPSW system with variation in perforation diameter and perforation patterns with two different types of stiffening conditions, i.e. highly stiffened and lightly stiffened at the floor beam levels. The seismic responses such as lateral stiffness, roof displacement, and base shear were compared and presented. It was observed that, with the increase in perforation diameters and number of perforations, the lateral stiffness of the SPSW system tend to be decreasing and the roof displacement increases for all the three ground motion data and in almost all the models. In the present cases, SAP2000 has been used as a modelling and analysis tool. September - November 2016 Copyright © 2016 i-manager publications. All rights reserved. i-manager Publications http://www.imanagerpublications.com/Article.aspx?ArticleId=8255