Evaluation Of Seismic Performance Of Existing Reinforced Concrete Buildings In Sri Lanka Using Pushover Analysis Approach – A Case Study

Abstract

Evaluation of seismic performance of existing buildings is vital to reduce their seismic vulnerability. Performance can be evaluated by the interaction between structure’s capacity and the probable seismic demands. After the evaluation, suitable retrofitting methods can be used to enhance performance by modifying the capacity. In this paper the performance of a four storied reinforced concrete building was evaluated using pushover analysis. The nonlinear behaviour of the structure was simulated using plastic hinges of which properties were determined using FEMA356. The SAP2000 finite element analysis software package was used to obtain the capacity curve of the building. The performance was evaluated using the capacity spectrum method proposed by ATC40 under the application of seismic demands derived from ATC40 document and AS1170.4 (2007) standard.Results showed that the performance of the building is satisfactory in both X and Y directions for all seismic demands determined using ATC40 document and AS1170.4 (2007).