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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Open Sees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。
In this paper, the seismic responses of the frame-type curved beam bridge with hinged structure are analyzed. Taking an actual bridge in the US seismic belt as an example, a full-bridge three-dimensional model is established through the Open Sees platform and the bite structure and limiting device , The time-history analysis is used to get the influence of the damage location, damage process and seismic excitation angle on the seismic response of the hinge point in the articulated structure. The results show that the longitudinal restraining reinforcement in the articulated structure of the frame-type curved beam bridge and the transversely-compressed supporting cushion are weak earthquake-resistant members. The anchorage zone concrete in the longitudinal restraining reinforcement in the articulated structure and the concrete in the slanting zone in the occluded position are easy to be subjected to earthquakes Resulting in cracking and cracking; asymmetric frame-type curved beam bridge at different hinge points seismic response vary greatly, the height of the symmetrical arrangement of the pier will make the difference decreases; longitudinal seismic excitation, the hinge point longitudinal limit device greater damage occlusion The vertical seismic response in the area is large, but this seismic excitation will ameliorate the damage degree of the transverse limit device at different hinge points. Under transverse seismic excitation, the lateral limit device of hinge point is more damaged, and the lateral seismic response Larger, but this seismic excitation will equalize the degree of damage to the longitudinal stop at different hinge points.