Development of Seismic Collapse Capacity Spectra and Parametric Study

Single-Degree-of-Freedom (SDOF) systems are widely used to investigate the collapse resistance of building structures. A SDOF model capable of representing the key properties associated with earthquake-induced collapse is outlined in this study. The seismic collapse capacity of SDOF systems is evaluated via an incremental dynamic analysis, based on which the collapse capacity spectrum is developed. The computational procedure and engineering significance of the collapse capacity spectrum are elaborated in some detail. The influence of various structural properties on the collapse resistance of SDOF structural systems is also comprehensively discussed, which include fundamental period, ductility ratio, post-capping stiffness, hysteretic pinching, cyclic deterioration and P-Delta effect. Furthermore, the influence of ground motion features on the collapse resistance of SDOF systems is examined by using the proposed collapse capacity spectrum.