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支座连接件是桥梁整体抗震性能的一个薄弱环节,针对汶川地震中大量桥梁支座普遍出现病害的现象,基于能量耗散理论提出了辊轴摩擦支座的应用。利用有限元分析软件ANSYS对地震波激励下普通橡胶支座与滚轴摩擦支座的地震响应进行对比,重点分析了其沿支座平动方向的动力特性,研究结果表明,辊轴摩擦支座在控制地震响应的同时能很好地控制梁体移位,延长桥梁结构的自振周期,避开地震能量的集中区,降低结构的内力及位移,使结构内力得以合理分配,支座在运动不发生转动,只有水平方向平动,保证上部结构的稳定性,震后结构复位较容易,隔震效果显著。
Bearing joints are a weak link in the overall seismic performance of the bridge. Aimed at the widespread damage of a large number of bridge supports in the Wenchuan earthquake, the application of roller bearing was proposed based on energy dissipation theory. Using the finite element analysis software ANSYS, the seismic response of ordinary rubber bearings and roller friction bearings under earthquake excitation is contrasted. The dynamic characteristics of the friction bearings along the translation direction are analyzed emphatically. The results show that the friction bearings of roller bearings Control the seismic response and control the displacement of the beam well, prolong the natural vibration period of the bridge structure, avoid the concentrated area of seismic energy, reduce the internal force and displacement of the structure, so that the internal forces of the structure can be rationally distributed. Rotation, only the horizontal translation, to ensure the stability of the superstructure, post-earthquake structure easier to reset, isolation effect is significant.