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为了研究大跨径桥梁铰接跨的复杂破坏状态,应用地震工程分析软件OpenSees,对美国加州Yuba桥铰接梁跨的三维纤维单元模型进行了分析。探讨了简化模型和细分模型对铰接构造模拟的可行性;并且通过Pushover逐级增加控制位移研究了铰接梁跨各构件的屈服破坏过程;同时得到:铰接位置某个限位装置发生破坏时,其为铰接点提供的相应刚度随之丧失,即使主梁根部尚未发生塑性破坏,其弯矩与曲率之比也会随之发生变化。
In order to study the complicated failure state of the hinging span of the long-span bridges, the 3D fiber unit model of the articulated beam of Yuba Bridge in California was analyzed by using OpenSees, an earthquake engineering analysis software. The feasibility of simplified model and subdivision model on the simulation of the hinge structure was discussed. The yield failure of the articulated beam was studied by increasing the control displacement step by step. At the same time, The consequent loss of the corresponding stiffness provided by the articulation point results in a change in the ratio of bending moment to curvature even though plastic deformation has not occurred at the root of the main girder.