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为了提高板式橡胶支座梁桥的横桥向抗震性能,选择一座典型板式橡胶支座简支梁桥为研究背景,建立考虑支座滑动效应、墩柱弹塑性滞回性能和挡块力学性能的全桥精细化有限元数值模型,采用数值分析方法探讨了钢筋混凝土挡块的合理力学性能参数。结果表明:挡块最大剪力强度取上部结构恒载反力的20%~30%、横向间隙在2~10 cm范围内为相对合理的挡块力学性能;提高挡块延性变形能力,可有效控制墩梁相对位移,同时不显著增加桥墩损伤程度。
In order to improve the transverse seismic performance of slab rubber bearing girder bridge, a typical slab rubber bearing simply supported girder bridge is selected as the research background, and the influence of bearing slippage, elastoplastic hysteretic behavior and the mechanical properties of the block Full bridge finite element numerical model, numerical analysis method to explore the reasonable mechanical properties of reinforced concrete block parameters. The results show that the maximum shear strength of the block takes 20% -30% of the static load reaction force of the superstructure and the transverse clearance is relatively reasonable in the range of 2 ~ 10 cm. The improvement of the ductile deformation capacity of the block is effective Control the relative displacement of pier, while not significantly increasing the damage of pier.