【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。更多还原

【Abstract】 A 3D finite element analysis model of a continuous concrete girder bridge was established as an example.Under the excitations of three artificial earthquake waves,the energy responses of the non-isolated bridge and the FPS isolated bridge were calculated using the non-linear time history analysis method in the longitudinal direction and the energy dissipation effects of three isolation schemes were compared.Furthermore,the effects of equivalent sliding radius and the friction coefficient on the energy responses and the energy distributions were also investigated.The research results indicate that,for an isolated bridge,most seismic energy was dissipated by FPS and the energy dissipation demand of the bridge structure was decreased efficiently,and the effect of full isolation scheme was the best one among the three different isolation schemes.The energy dissipation efficiencies of FPS were enhanced and the structure energy dissipation demands were effectively decreased with the increments of both equivalent sliding radius and the friction coefficient.However,when the equivalent sliding radius and the friction coefficient were relatively large,the enhancement of energy dissipation efficiency tends to be little.更多还原