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Title: Seismic Performance Assessment of Retrofitted Curved RC Bridge: A Case Study

Author(s): Mohammad Raihan Mukhlis, Sohel Rana, and M. Abdur R. Bhuiyan

Publication: Symposium Paper

Volume: 358


Appears on pages(s): 126-157

Keywords: curved RC bridge, demand-capacity ratio, displacement ductility, HDRBs, performance objectives, residual displacement, seismic fragility, shear strain of bearing

DOI: 10.14359/51740234

Date: 9/1/2023

This paper focuses on seismic evaluation of retrofitted curved RC bridge in two phases. In first phase, seismic performance of piers was evaluated by equivalent static method using two performance objectives and by nonlinear dynamic method using a suit of compatible ground motion records. In this regard, demand capacity ratio and residual displacement were evaluated in static method and base shear and deck displacement were evaluated in dynamic method. High damping rubber bearings were used for isolation retrofitting purpose, replacing the elastomeric bearing of the as-built bridge. In second phase, damage state corresponding to large displacements in the bridge components was assessed in terms of component and system fragility curves. The numerical results show that the isolation-retrofitted bridge experiences less base shear force associated with increased deck displacement compared with the as-built bridge having no collapse damage state for considered hazard levels.