Premium
A new proxy for ground motion selection in seismic collapse assessment of tall buildings
Author(s) -
Yakhchalian Masood,
Ghodrati Amiri Gholamreza,
Nicknam Ahmad
Publication year - 2013
Publication title -
the structural design of tall and special buildings
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.895
H-Index - 43
eISSN - 1541-7808
pISSN - 1541-7794
DOI - 10.1002/tal.1143
Subject(s) - ground motion , particle swarm optimization , proxy (statistics) , selection (genetic algorithm) , nonlinear system , geology , structural engineering , computer science , mathematics , mathematical optimization , seismology , engineering , physics , statistics , artificial intelligence , quantum mechanics
SUMMARY Tall buildings are long‐period structures that are sensitive to the long‐period content of ground motions. Selection of appropriate ground motions is an important step in seismic collapse assessment of tall buildings using nonlinear dynamic analyses. Epsilon ( ε Sa ) and eta ( η ) are two spectral shape indicators, which have been recently proposed for ground motion selection in the technical literature. In this study, a new parameter gamma ( γ ) is proposed, which has considerable correlation with the collapse capacity of long‐period structures having a fundamental period greater than 1 s. This parameter is a linear combination of ε Sa and the displacement spectrum intensity epsilon ( ε DSI ). The parameter γ is obtained and optimized by applying the particle swarm optimization algorithm. Since γ has significant correlation with the collapse capacity of long‐period structures, it can be used as an efficient proxy for ground motion selection in seismic collapse assessment of tall buildings. The results of this study show that ground motion selection considering the new proxy γ causes reduction in the dispersion of structural response and also decrease in the mean annual frequency of collapse, when compared with ground motion selection based on ε Sa and η . Copyright © 2013 John Wiley & Sons, Ltd.