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Risk- and Performance-Based Seismic Analysis for Long-Span Cable-Stayed Bridges
Generally deterministic design procedures are to achieve target of different structural performance under earthquake excitation are used. However, for the current levels of seismic performance, it may not be the most appropriate. In this paper, a framework of seismic risk analysis procedure which includes seismic hazard analysis, seismic vulnerability analysis and seismic risk assessment is proposed. Some suitable suite of ground motions are adopted by applying seismic hazard analysis, and the seismic vulnerability curves of bridges are depicted by using incremental dynamic analysis method (IDA). When getting the results with respect to hazard intensity-recurrence relations, a risk related matrix in which the importance of different elements of bridges and vulnerability of different elements are considered is used to get the probability of structural damage states. The evaluation using a risk assessment matrix can be referenced for seismic design or seismic mitigation. An illustrative example of this procedure is given for a long-span cable-stayed bridge and the main tower which is the most important element. It is shown that the main tower remains well under the earthquake excitation with PGA=0.3g. When PGA is about 0.6g, different countermeasures should be taken to reduce the risk of damage of the tower.
Risk- and Performance-Based Seismic Analysis for Long-Span Cable-Stayed Bridges
Generally deterministic design procedures are to achieve target of different structural performance under earthquake excitation are used. However, for the current levels of seismic performance, it may not be the most appropriate. In this paper, a framework of seismic risk analysis procedure which includes seismic hazard analysis, seismic vulnerability analysis and seismic risk assessment is proposed. Some suitable suite of ground motions are adopted by applying seismic hazard analysis, and the seismic vulnerability curves of bridges are depicted by using incremental dynamic analysis method (IDA). When getting the results with respect to hazard intensity-recurrence relations, a risk related matrix in which the importance of different elements of bridges and vulnerability of different elements are considered is used to get the probability of structural damage states. The evaluation using a risk assessment matrix can be referenced for seismic design or seismic mitigation. An illustrative example of this procedure is given for a long-span cable-stayed bridge and the main tower which is the most important element. It is shown that the main tower remains well under the earthquake excitation with PGA=0.3g. When PGA is about 0.6g, different countermeasures should be taken to reduce the risk of damage of the tower.
Risk- and Performance-Based Seismic Analysis for Long-Span Cable-Stayed Bridges
Wang, Binbin (author) / Yuan, Wancheng (author)
Technical Council on Lifeline Earthquake Engineering Conference (TCLEE) 2009 ; 2009 ; Oakland, California, United States
TCLEE 2009 ; 1-12
2009-06-24
Conference paper
Electronic Resource
English
Risk- and Performance-Based Seismic Analysis for Long-Span Cable-Stayed Bridges
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