Sharif University of Technology Scientia Iranica 1026-3098 24 5 2017 10 01 Reliable seismic collapse assessment of short-period structures using new proxies for ground motion record selection 2283 2293 4162 10.24200/sci.2017.4162 EN M. Yakhchalian Department of Civil Engineering and Surveying , Islamic Azad University, Qazvin Branch , P.O. Box 34185 - 1416, Qazvin, Iran Gholamreza Ghodrati Amiri Center of Excellence for Fundamental Studies in Structural Engineering, School of Civil Engineering, Iran University of Science &Technology, Tehran, Iran 0000-0003-3244-0943 Mahdi Eghbali School of Civil Engineering, Iran University of Science & Technology, P.O. Box 16765 - 163, Tehran, Iran Journal Article 2015 11 19 One of the important steps in seismic collapse assessment of structures by using nonlinear dynamic analyses is the appropriate selection of ground motion records. Epsilon (εSa), eta (η), and gamma (γ) for long-period structures, are proxies that have been recently proposed for Ground Motion Record Selection (GMRS). In this study, two parameters, named γs, are proposed, which have considerable correlation with the collapse capacity of short-period structures having fundamental period less than 1 s. One of these parameters is a linear combination of εSa, epsilon of Pseudo Spectral Acceleration (PSA) at 1.5 times of the fundamental period of the structure (εSa(1.5T1)) and εPGV. The other one is a linear combination of εSa, εSa(1.5T1) and epsilon of spectrum intensity, εSI. To obtain and optimize γs, the Particle Swarm Optimization (PSO) algorithm is applied. Since the parameters proposed as γs have significant correlation with the collapse capacity of short-period structures, they can be used as efficient proxies for GMRS in seismic collapse assessment of short-period structures. The results show that GMRS using γs leads to reduction in the dispersion of structural collapse capacity in comparison with GMRS based on εSa or η.

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