EFFECT OF MATERIAL DETERIORATION ON THE SEISMIC COLLAPSE CAPACITY OF P-DELTA VULNERABLE SDOF SYSTEMS

The aim of the present contribution is quantify the effect of material deterioration on the seismic collapse capacity of single-degree-of-freedom systems vulnerable to the destabilizing effect of gravity loads (P-delta effect). The outcomes are presented in terms of collapse capacity spectra, where for characteristic structural parameters median and dispersion of record-dependent collapse capacities is plotted against the initial structural period. The ultimate goal of this study is to isolate sets of material deterioration parameters, which do not affect substantially the collapse capacity of P-delta sensitive structures. These threshold values depend primarily on the post-yield stiffness ratio, the assigned hysteretic law, and the initial structural period.