铰接点纵向间距对铰接跨破坏状态的影响分析

Analysis of Impact to Damage State of One Span with Hinge in Different Longitudinal Spacings of Hinge

为了探索铰接位置的纵向间距对桥梁铰接跨破坏状态的影响,本文采用地震工程分析软件OpenSees对美国加州Yuba桥的铰接梁跨建立纤维单元模型,对细化模型和简化模型进行Pushover分析,并且对铰接点两侧主梁的不同纵向间距进行对比研究,结果表明:细化模型能更准确地模拟铰接位置的纵向碰撞;铰接点两侧主梁的纵向间距对结构的碰撞过程、结构的屈服过程有很大的影响;较小的纵向间距有利于延长墩梁固结处主梁的线性工作状态,当此梁段发生屈服破坏时,较小的纵向间距还能有效抑制屈服后主梁刚度下降的速率。

One span of California Yuba Bridge,which has a hinge,is simulated to be a Fiber Element model by OpenSess in order to obtain the impact to damage state of one span with a hinge in different longitudinal spacings of hinge. And the detailed model and simplified model are analyzed by Pushover. Through the above simulations and the comparison of modes with different longitudinal spacings on the two sides of hinge,the conclusion shows that the detailed model is better to simulate the hinge accompanying by longitudinal pounding,the longitudinal spacing has a great impact to the process of pounding and process of structural yield. The smaller spacing is good to prolong the linear working state of girder in the position of pier-beam consolidation. When the girder in this position begins to yield,the smaller spacing can also control the declining rate of girder stiffness effectively.