Reliability Analysis of River Bridge against Scours and Earthquakes
Publication: Journal of Performance of Constructed Facilities
Volume 32, Issue 3
Abstract
This study proposes a bridge safety evaluation process against seismic and flood hazards. Because uncertainties in the scours, seismic hazard, and structural performance for a given seismic excitation are inevitable and important, reliability analysis is adopted. A scour prediction equation for a bridge with a complicated foundation system is developed and a probabilistic scour curve is constructed to measure the risk of scours using the Monte Carlo simulation. The seismic hazard is measured using the probabilistic seismic-hazard analysis. A series of nonlinear time-history analyses are performed to determine the structural performance under different peak ground acceleration values. Specific software is used to build the finite-element model where the soil is modeled using a bilinear link. A plastic hinge is predefined to simulate the nonlinear behaviors of the pier and caisson of the bridge. The displacement ductility is used to measure the structural performance and to construct the fragility curve for various limit states. The Nanyun Bridge located in central Taiwan is selected as an example to demonstrate the proposed safety evaluation procedure. The results show that the probable scour depth of the Nanyun Bridge is from 3 to 5 m. The failure probability considering the floods and earthquakes is insignificant. A deterministic design value, considering both the hazards, is provided for a given reliability target (e.g., ) to help engineers in their present design processes.
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Acknowledgments
This study was supported by the TU-NTUST Joint Research Program. The support is gratefully acknowledged.
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Published In
Journal of Performance of Constructed Facilities
Volume 32 • Issue 3 • June 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Mar 28, 2017
Accepted: Nov 2, 2017
Published online: Mar 27, 2018
Published in print: Jun 1, 2018
Discussion open until: Aug 27, 2018
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