Keywords: nonlinear, static pushover analysis, capacity spectrum method, displacement coefficient method, SAP2000, ATC40, Poisson's ratio..

Static pushover analysis is becoming a popular tool for seismic performance evaluation of new and existing structures. In this paper the seismic performance of an existing structure in Hyderabad is evaluated. Pushover analysis is carried out using the SAP2000 software; results are presented. Depending upon the hinge formations a suitable retrofitting technique is suggested. The study is carried out in two phases. The first phase deals with the lateral load analysis and design of the building; the second phase deals with the pushover analysis of the building. During the lateral load analysis and design it is observed that many frame members were failing the design check performance for the reinforcement, sizes of the sections for the given loads as provided exactly for the building. Hence, the material properties, grade of concrete, section sizes of all columns and that of a few beams were upgraded. By using performance evaluation methods, it is determined that the building's performance would be at immediate occupancy state for the considered demand. Both ATC40 capacity spectrum method and displacement coefficient method give the same results. The drift ratios calculated are below one percent for all cases of the analysis. Comparison of pushover analysis for varying Poisson's ratio between 0.15 and 0.20 was completed.

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