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Sivathayalan, S.
Department of Civil and Environmental Engineering, Carleton University, Ottawa,
Civil Engineering, Building, Construction & Architecture

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Generalized Fragility Relationships with Local Site Conditions for Probabilistic Performance-based Seismic Risk Assessment of Bridge Inventories Lau, D.T.; Vishnukanthan, K.; Waller, C.L.; Sivathayalan, S.
Civil Engineering Dimension Vol. 14 No. 3 (2012): Special Edition
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1222.979 KB) | DOI: 10.9744/ced.14.3.127-138

Abstract

The current practice of detailed seismic risk assessment cannot be easily applied to all the bridges in a large transportation networks due to limited resources. This paper presents a new approach for seismic risk assessment of large bridge inventories in a city or national bridge network based on the framework of probabilistic performance based seismic risk assessment. To account for the influences of local site effects, a procedure to generate site-specific hazard curves that includes seismic hazard microzonation information has been developed for seismic risk assessment of bridge inventories. Simulated ground motions compatible with the site specific seismic hazard are used as input excitations in nonlinear time history analysis of representative bridges for calibration. A normalizing procedure to obtain generalized fragility relationships in terms of structural characteristic parameters of bridge span and size and longitudinal and transverse reinforcement ratios is presented. The seismic risk of bridges in a large inventory can then be easily evaluated using the normalized fragility relationships without the requirement of carrying out detailed nonlinear time history analysis.
Co-Authors Lau, D.T. Vishnukanthan, K. Waller, C.L.