Title: Effect of aftershock intensity on seismic collapse fragilities

Authors: Negar Nazari; John W. Van de Lindt; Yue Li

Addresses: Department of Civil and Environmental Engineering, Colorado State University, Fort Collins, CO 80521, USA ' Department of Civil and Environmental Engineering, Colorado State University, Fort Collins, CO 80521, USA ' Department of Civil and Environmental Engineering, Michigan Technological University, Houghton, MI 49931, USA

Abstract: This paper presents a procedure to compute the sensitivity of a mainshock (MS)-damaged building's collapse probability to earthquake intensity as a function of magnitude or site-to-source distance. Specifically, the effect of earthquake magnitude and spatial distribution of aftershocks on collapse fragilities is investigated. Aftershock (AS) fragilities for different site-to-source distances are examined by performing incremental dynamic analysis (IDA) using a sequence of MS+AS ground motions. The effect of MS damage is to alter the fragilities which can be quantified for the building investigated. It is observed that the collapse fragilities have a reasonable variation in collapse probabilities with changing AS magnitude and/or site-to-source distance.

Keywords: structural degradation models; aftershock fragilities; incremental dynamic analysis; nonlinear time history analysis; magnitude distribution; spatial distribution; aftershock intensity; collapse risk; MS+AS ground motions; attenuation relationships; damaged buildings; building collapse; earthquake aftershocks; earthquakes; earthquake magnitude; mainshock damage; collapse probabilities.

DOI: 10.1504/IJRS.2014.069526

International Journal of Reliability and Safety, 2014 Vol.8 No.2/3/4, pp.174 - 195

Received: 31 Jul 2014
Accepted: 25 Mar 2015
Published online: 20 May 2015 *

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