Bridges are often in a harsh environment of chloride-induced corrosion.The seismic performance of RC bridge pier will degrade after chloride-induced corrosion.The accurate establishment of the numerical model of axial compressive,flexural,and shear interaction(AFSI)for corroded RC bridge piers is a prerequisite for the seismic evaluation of the bridge lifetime.Firstly,based on the modified compression field theory(MCFT),fiber element model,and corrosion theory,a simulation method of corroded pier with AFSI in consideration was established.Then,based on the AFSI numerical model,the seismic capability of the piers of a medium-span RC bridge was analyzed for the whole life cycle.Finally,the finite element model of the bridge was established to analyze its seismic fragility,and the influence of shear action on the damage probability of the bridge pier was studied.The results show that the AFSI numerical model can effectively simulate the corroded pier.During the whole life cycle of the bridge,the lateral resistance and energy dissipation capacity of the pier degrade.Corrosion improves the damage probability of the pier under an earthquake,and the seismic performance of the pier will be overestimated without considering the shear action,which is more and more significant in the case of strong earthquake and high corrosion degree.
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