Shedding Some Light On Seismic Input Selection


1 INTRODUCTION

One of the key issues in non-linear dynamic analysis of structures is the selection of appropriate seismic input, which should allow for an accurate estimation of the seismic performance on the basis of the seismic hazard at the site where the structures is located. If the probabilistic risk assessment of structures is concerned, procedures have been recently developed to properly select the seismic input. The basic steps are: (i) choosing a ground motion (GM) parameter considered to be representative of the earthquake potential with respect to the specific structure (i.e., a GM intensity measure, or IM 1




); (ii) to obtain the probabilistic seismic hazard analysis (PSHA) at the site, and disaggregation, for the chosen IM; (iii) to determine probability of collapse in terms of one or more engineering (structural) demand parameters, or EDP, as a function of the IM, i.e., the fragility function; (iv) to average


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