适应扭转的新型自复位桥墩抗震性能研究OA

To address the issue of plastic damage in fixed piers under coupled loading conditions(such as combined axial compression,bending,and torsion)in small-radius curved bridges,which is difficult to repair,a novel torsion-adaptable prestressed concrete self-centering pier is proposed.Based on ABAQUS,a numerical model of the pier was established and validated for reliability.A torsion-adaptable crawler-type metallic damper was designed as the energy-dissipating component.The mechanical behavior of the single pier under axial compression-bending and axial compression-bending-torsion coupled loading conditions was investigated.The effects of key parameters,including the steel plate thickness of the crawler-type damper,the curvature radius of the arc segment,and the axial compression ratio of the pier,were studied.The influence of these parameters on the seismic performance of the structure was analyzed from an energy perspective.The results demonstrate that the crawler-type damper exhibits excellent energy dissipation capacity and plastic deformation ability,making it a suitable energy-dissipating component for torsion-adaptable self-centering piers.It maintains stable performance under extreme conditions,avoiding rapid load-bearing capacity degradation and severe damage.Furthermore,under torsional loading,the novel self-centering pier shows improved load-bearing capacity and adaptability.Although the load-bearing capacity decreases,it retains a certain level of energy dissipation capability.This study provides a theoretical basis and practical reference for the design of small-radius curved bridges.