摩擦摆支座隔震连续梁桥地震能量反应研究

发布时间：2018-03-29 22:04

本文选题：桥梁工程　切入点：连续梁桥　出处：《振动与冲击》2017年16期

【摘要】：以某三跨混凝土连续梁桥为例,建立了该桥的空间有限元分析模型,在3条人工地震波作用下,采用非线性时程分析方法计算了应用摩擦摆支座(FPS)隔震前、后结构的纵向地震能量反应,对比了3种隔震体系的耗能效果,并研究了FPS等效滑动半径和摩擦因数对能量反应及分配的影响。分析研究结果表明,采用FPS隔震后结构体系绝大部分地震能量由支座耗散,可有效降低结构的能量耗散需求,保护结构安全,其中全桥隔震方案效果最好。增大等效滑动半径和摩擦因数均有利于提高FPS支座耗能减震效果,结构能量耗散需求随之减小,但当等效滑动半径和摩擦因数较大时,继续增大设计参数对耗能减震效果的改善作用趋于不变。
[Abstract]:Taking a three-span concrete continuous beam bridge as an example, the spatial finite element analysis model of the bridge is established. Under the action of three artificial seismic waves, the nonlinear time-history analysis method is used to calculate the seismic isolation before the application of friction pendulum support. The longitudinal seismic energy response of the post structure is compared with the energy dissipation effects of three isolation systems. The effects of FPS equivalent sliding radius and friction coefficient on the energy response and distribution are studied. Most of the seismic energy of the structure system is dissipated by bearing after FPS isolation, which can effectively reduce the energy dissipation requirement of the structure and protect the safety of the structure. The result of the whole bridge isolation scheme is the best. Increasing the equivalent sliding radius and friction coefficient can improve the energy dissipation effect of the FPS bearing, and the energy dissipation demand of the structure will decrease, but when the equivalent sliding radius and friction coefficient are large, The effect of increasing design parameters on the improvement of energy dissipation effect tends to be constant.
【作者单位】：山东省交通规划设计院;北京交通大学土木建筑工程学院;
【分类号】：U442.55

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