Sharif University of TechnologyScientia Iranica1026309824520171001Reliable seismic collapse assessment of shortperiod structures using new proxies for ground motion record selection22832293416210.24200/sci.2017.4162ENM. YakhchalianDepartment of Civil Engineering
and Surveying
, Islamic Azad University, Qazvin Branch
,
P.O.
Box
34185

1416,
Qazvin, IranGholamreza Ghodrati AmiriCenter of Excellence for Fundamental Studies in Structural Engineering, School of Civil Engineering, Iran University of Science &Technology, Tehran, Iran0000000332440943Mahdi EghbaliSchool of Civil Engineering, Iran University of Science & Technology, P.O. Box
16765

163,
Tehran, IranJournal Article20151119One of the important steps in seismic collapse assessment of structures by using nonlinear dynamic analyses is the appropriate selection of ground motion records. Epsilon (<em>ε<sub>Sa</sub></em>), eta (<em>η</em>), and gamma (<em>γ</em>) for longperiod structures, are proxies that have been recently proposed for Ground Motion Record Selection (GMRS). In this study, two parameters, named <em>γ<sub>s</sub></em>, are proposed, which have considerable correlation with the collapse capacity of shortperiod structures having fundamental period less than 1 s. One of these parameters is a linear combination of <em>ε<sub>Sa</sub></em>, epsilon of Pseudo Spectral Acceleration (PSA) at 1.5 times of the fundamental period of the structure (<em>ε<sub>Sa</sub></em><sub>(1.5<em>T</em>1)</sub>) and <em>ε<sub>PGV</sub></em>. The other one is a linear combination of <em>ε<sub>Sa</sub></em>, <em>ε<sub>Sa</sub></em><sub>(1.5<em>T</em>1)</sub> and epsilon of spectrum intensity, <em>ε<sub>SI</sub></em>. To obtain and optimize <em>γ<sub>s</sub></em>, the Particle Swarm Optimization<strong> </strong>(PSO) algorithm is applied. Since the parameters proposed as <em>γ<sub>s</sub></em> have significant correlation with the collapse capacity of shortperiod structures, they can be used as efficient proxies for GMRS in seismic collapse assessment of shortperiod structures. The results show that GMRS using <em>γ<sub>s</sub></em> leads to reduction in the dispersion of structural collapse capacity in comparison with GMRS based on <em>ε<sub>Sa</sub></em> or <em>η</em>.https://scientiairanica.sharif.edu/article_4162_c2a1941cc56d7cd698b230f0a96db9d6.pdf