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DETERMINATION OF PERFORMANCE POINT IN CAPACITY SPECTRUM METHOD

V.Vysakh Dr. Bindhu K.R. Rahul Leslie

Performance based seismic design (PBSD) method is getting wide recognition as the most suitable seismic design process. PBSD is essentially a displacement based seismic design process involving the determination of performance point. The capacity spectrum method is one of the most established and widely accepted displacement based seismic design method which is used for performance based seismic design. ATC 40 report published by Applied Technology Council identifies three capacity spectrum procedures A, B and C for determination of performance point. Procedure A is the most direct application of the theory while procedure B is based on the simplifying assumption of constant post yield slope. Procedure C is a purely graphical method that is not convenient for programming. The assumption may introduce some error into the procedure B. The conventional software packages like ETABS, SAP2000 are based on procedure B. The current study involves developing a program based on procedure A and comparing the outputs of the developed program and conventional software ETABS.