隔震曲线桥梁碰撞研究

目前,铅芯橡胶隔震支座已应用于曲线桥梁,由于采用铅芯橡胶支座,地震作用下梁体位移增大,相邻梁体间容易产生碰撞。国内外对于曲线桥梁碰撞的研究相对甚少,本文以一座三联曲线桥梁为研究对象,用非线性时程分析确定曲线桥梁最不利地震输入角度,在此基础上,用本文确定的最不利地震输入角度讨论了曲线桥梁梁间碰撞响应对梁及桥墩的影响。计算结果表明,曲线桥梁采用隔震支座后,可以明显消耗碰撞过程中产生的能量,碰撞对桥墩影响不大,但是瞬时的碰撞对梁轴力影响很大。

Research on Pounding of Isolated Curved Bridge

Now,lead rubber bearings are beginning to be used in curved bridge.As the lead rubber bearing adopted,the displacement of bridge beam augments,causing impact between beams.There is little research on the beam pounding of curved bridges.In this paper,a three spans curved bridge is adopted as analysis modal to summarize a simple analysis method on the most adverse input angle of earthquake,using nonlinear analysis.Based on this earthquake angle-input method, the influence of the pounding on curved bridge to bridge beam and pier is considered.The results indicate that the huge energy from pounding of relative beams can be dissipated by the isolated bearing used in the bridge.The instantaneous pounding between beams is adverse for beam axial force,but affects pier little.