Application of reliability-based robustness assessment of steel moment resisting frame structures under post-mainshock cascading events

Ribeiro, Filipe L.A.; Barbosa, Andr� R.; Neves, Lu�s C.

Abstract

This paper proposes a reliability-based framework for quantifying structural robustness considering the occurrence of a major earthquake (mainshock) and subsequent cascading hazard events, such as aftershocks that are triggered by the mainshock. These events can significantly increase the probability of failure of buildings, especially for structures that are damaged during the mainshock. The application of the proposed framework is exemplified through three numerical case studies. The case studies correspond to three SAC steel moment frame buildings of three, nine, and 20 stories, which were designed to pre-Northridge codes and standards. Two-dimensional nonlinear finite-element models of the buildings are developed with the Open System for Earthquake Engineering Simulation framework (OpenSees), using a finite length plastic hinge beam model and a bilinear constitutive law with deterioration, and are subjected to multiple mainshock-aftershock seismic sequences. For the three buildings analyzed herein, it is shown that the structural reliability under a single seismic event can be significantly different from that under a sequence of seismic events. The reliability based robustness indicator shows that the structural robustness is influenced by the extent to which a structure can distribute damage.

Citation

Ribeiro, F. L., Barbosa, A. R., & Neves, L. C. (in press). Application of reliability-based robustness assessment of steel moment resisting frame structures under post-mainshock cascading events. Journal of Structural Engineering, 140(8), Article A4014008. https://doi.org/10.1061/%28ASCE%29ST.1943-541X.0000939

• Journal Article Type: Article
• Acceptance Date: Sep 6, 2013
• Online Publication Date: Mar 10, 2014
• Deposit Date: Sep 18, 2017
• Publicly Available Date: Sep 18, 2017
• Journal: Journal of Structural Engineering
• Print ISSN: 0733-9445
• Electronic ISSN: 1943-541X
• Publisher: American Society of Civil Engineers
• Peer Reviewed: Peer Reviewed
• Volume: 140
• Issue: 8
• Article Number: A4014008
• DOI: https://doi.org/10.1061/%28ASCE%29ST.1943-541X.0000939
• Keywords: Aftershock; Nonlinear dynamic analysis; Robustness; Seismic sequences; Structural Safety and Reliability
• Public URL: https://nottingham-repository.worktribe.com/output/725464
• Publisher URL: http://ascelibrary.org/doi/10.1061/%28ASCE%29ST.1943-541X.0000939