Amirkabir University of TechnologyAmirkabir Journal of Civil Engineering2588-297X53720210923Effect of Structural Parameters on Failure Probability of Piers in Seismic Isolated Concrete BridgesEffect of Structural Parameters on Failure Probability of Piers in Seismic Isolated Concrete Bridges1616413010.22060/ceej.2020.17505.6617FAMahmoud R.ShiravandShahid Beheshti UniversityMohammadVasefShahid beheshti Un.Journal Article20191228Bridges are a critical part of the urban and suburban transportation network, so they are supposed to be designed to sustain earthquake-induced damages to be utilized after the earthquake. Various parameters can affect the behavior and probability of failure of a bridge and the present work aims to evaluate the effects of structural parameters on the probability of failure in isolated concrete bridges. OpenSees software is used for simulating and analyzing 16 different bridge models. Incremental dynamic analysis is conducted using this software and IDA and fragility curves of models are derived and presented. The results showed that the probability of failure decreases with the increase of the pier diameter, concrete compressive strength, yield strength of longitudinal rebar, and diameter of longitudinal bars. Also increasing the stiffness of the elastic isolator and decreasing the confined diameter of the pier resulted in increasing the probability of failure. Furthermore, results revealed that the probability of failure is more sensitive to the variation of pier confined diameter, yield strength of longitudinal rebar, the diameter of longitudinal bars, and the stiffness of elastic isolators in comparison with the variation of concrete compressive strength.Bridges are a critical part of the urban and suburban transportation network, so they are supposed to be designed to sustain earthquake-induced damages to be utilized after the earthquake. Various parameters can affect the behavior and probability of failure of a bridge and the present work aims to evaluate the effects of structural parameters on the probability of failure in isolated concrete bridges. OpenSees software is used for simulating and analyzing 16 different bridge models. Incremental dynamic analysis is conducted using this software and IDA and fragility curves of models are derived and presented. The results showed that the probability of failure decreases with the increase of the pier diameter, concrete compressive strength, yield strength of longitudinal rebar, and diameter of longitudinal bars. Also increasing the stiffness of the elastic isolator and decreasing the confined diameter of the pier resulted in increasing the probability of failure. Furthermore, results revealed that the probability of failure is more sensitive to the variation of pier confined diameter, yield strength of longitudinal rebar, the diameter of longitudinal bars, and the stiffness of elastic isolators in comparison with the variation of concrete compressive strength.https://ceej.aut.ac.ir/article_4130_0f1b0914565d68f18a0c4cc3e643e092.pdf