Allowing Traffic Over Mainshock-Damaged Bridges |
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Authors: | Paolo Franchin Paolo E Pinto |
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Institution: | 1. Department of Structural &2. Geotechnical Engineering , University of Rome La Sapienza , Rome, Italy paolo.franchin@uniromal.it;4. Geotechnical Engineering , University of Rome La Sapienza , Rome, Italy |
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Abstract: | A criterion is proposed for deciding whether, after a damaging mainshock, a bridge can still be open for either emergency or ordinary traffic. The criterion is based on the comparison between the collapse risk of the mainshock-damaged structure and the pre-mainshock risk of the intact structure. The approach requires fragilities for multiple damage states for the intact structure, and transition probabilities from these states to collapse for the damaged structure. The aftershock risk decreases with time, hence a decision for reopening might have to wait until the risk level goes down to an acceptable value. A realistic application demonstrates the approach. |
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Keywords: | Aftershock Progressive Damage Transition Fragility Time-Varying Collapse Risk |
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