框架式曲线梁桥铰接构造地震反应研究分析

该文针对框架式曲线梁桥铰接构造的地震反应进行分析研究，以美国强震带的一实际桥梁为例，通过OpenSees平台建立全桥三维模型并精细模拟铰接点的咬合构造和限位装置，采用时程分析获得铰接构造内的易损伤位置、损伤过程及地震激励角度对铰接点地震反应的影响。研究结果表明：框架式曲线梁桥铰接构造内的纵向限位钢筋，横向受压支撑垫是抗震薄弱构件；铰接构造内纵向限位钢筋的锚固区混凝土以及咬合位置受拉区混凝土在地震中容易产生开裂破坏；非对称框架式曲线梁桥不同铰接点地震反应相差很大，墩高对称布置会令该差值减小；纵桥向地震激励下，铰接点纵向限位装置损伤较大，咬合区域竖向地震反应较大，但这一地震激励会均化不同铰接点处横向限位装置的损伤程度；横桥向地震激励下，铰接点横向限位装置损伤较大，咬合区域横向地震反应较大，但这一地震激励会均化不同铰接点处纵向限位装置的损伤程度。

STUDY AND ANALYSIS FOR SEISMIC RESPONSE OF HINGE IN FRAME-STYLE CURVED GIRDER BRIDGE

In order to study the seismic response of hinge in frame-style curved girder bridge, a 3D model of actual bridge in high seismic region in American is established in OpenSees. Time history analysis is performed to study the seismic response of hinge and the impact of earthquake excitation angle on seismic response. The results show that longitudinal restrained steels and transverse compressive pads are seismic fragile components. Concrete located at the anchor zone of longitudinal restrained steels and the tensile zone of occlusal area in hinge is liable to crack. Different hinges in unsymmetrical bridge have significantly different seismic responses, though the difference is small in symmetrical bridge. Longitudinal excitation generates serious damage of longitudinal restrained devices and large vertical response of occlusal area, but it can homogenize damage of transverse restrained devices in different hinges. Transverse excitation generates serious damage of transverse restrained devices and large transverse response of occlusal area, but it can also homogenize the damage of longitudinal restrained devices in different hinges.