Performance Based Analysis of Composite Structure

Abstract

Performance-Based Plastic Design (PBPD) method has been recently developed to achieve enhanced performance of earthquake resistant structures. The design concept uses pre-selected target drift and yield mechanism as performance criteria. This study investigates the seismic behavior of concrete-filled rectangular steel tube (CFRT) structure, a push-over analysis of a 10-story moment resisting frame (MRF), for Composite (composed of CFRT columns and steel beams) structure was conducted using ETABS 2013. The M-φ curves and P-M interaction surfaces of the CFRT column ( AISC 360-10) and Steel beam (AISC-LRFD-93) are calculated for push-over analyses with user defined hinges.

 The Composite frame showed much improved response meeting all desired performance objectives, including the intended yield mechanisms and the target drifts. The results show that the ductility and seismic performance of Composite (CFRT) structure is superior. Consequently, Composite (CFRT) structures are recommended in seismic regions. This study shows that the PBPD approach can be successfully applied to Composite moment frame structure as well.