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Seismic Performance Evaluation of End-Restraining Integral Abutment Bridge with FRP Jacketing
Lorenz Lerry Ballon Moreno 한밭대학교 대학원 2019 국내석사
An end-restraining integral abutment bridge is restrained at both ends by the abutments and which has been proposed to form a monolithic rigid frame structure. Thus, the feasible horizontal force effect due to an earthquake or a vehicle braking is mainly prevented by the end-restraining abutments. In a recent study, a fully integral bridge with appropriate end-restraining abutment stiffness was derived for a multi-span continuous railroad bridge based on linear-elastic behavior. Therefore, this study aims to investigate the nonlinear behavior and seismic capacity of the end-restraining integral abutment bridge, and then to assess the appropriate stiffness of the end-restraining abutment to sufficiently resist design earthquake loadings through a rigorous parametric study. The finite element modeling and analyses are performed using OpenSees. In order to obtain the force-deflection curves of the models, nonlinear static pushover analysis is performed. It is confirmed that the end-restraining integral abutment bridge prototype with and without FRP in the study meets the seismic performance criteria specified by Caltrans. The nonlinear static pushover analysis results reveal that, due to the end-restraining effect of the abutment, the lateral displacement of the end-restraining integral abutment bridge radically reduces and the intermediate piers sustain much less lateral force and displacement. Then, the sectional member forces are well-controlled in the intermediate piers by a proper application of the end-restraining abutments. The parametric analysis results of the end-restraining integral abutment bridge with FRP provides insights to the nonlinear behavior and the effectiveness of CFRP confinement when applied to the end-restraining abutment.