Analytical approach for the earthquake performance evaluation of repaired/retrofitted RC bridge piers using time-dependent element

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In order to evaluate the seismic performance of damaged reinforced concrete members, particularly bridge piers, an inelastic time-dependent element is proposed. The proposed element enables increased characteristics due to structural intervention (i.e., repair or retrofitting) to be accurately reflected in the degraded strength and stiffness of the members. The inelastic time-dependent element having both birth and death times can freely be activated within the user-defined time intervals of interest during static and dynamic time-history analyses. Comparative studies are carried out for reinforced concrete bridge columns that are repaired and retrofitted. Analytical predictions incorporating the developed element show reasonable correlation with experimental results. Also conducted is a nonlinear time-history analysis of a reinforced concrete bridge under multiple earthquakes. Comparative analytical results confirm the applicability and effectiveness of the current development. It is thus expected that the present element is capable of providing salient features for the healthy evaluation of seismic performance of reinforced concrete members being repaired and retrofitted.

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