【摘要】 以组合使用板式橡胶支座与黏滞阻尼器的减隔震连续梁桥为例,采用先强迫解耦再进行模态时程分析的方法,对减隔震装置的不同布设位置和等效阻尼系数取值进行参数敏感性分析。结果表明:减隔震装置产生的集中阻尼改变了结构整体阻尼的分布特性,减隔震装置的布设位置和耗能能力分布越不均匀,结构的非经典阻尼特性越明显;随着减隔震装置等效阻尼系数增加,结构各阶振型模态阻尼比也随之增大,非经典阻尼对结构地震响应的影响也越来越大;可近似解耦范围与桥梁结构形式、等效阻尼系数取值有关。更多还原

【Abstract】 Taking isolated seismic continuous girder bridge combined with laminated rubber bearing and viscous damping for example,through modal time history analysis after decoupling by forced uncoupling method,parametric sensitivities of values for different arrangement positions and equivalent damping coefficients of seismic isolation devices were analyzed.The result indicates that non-classical damping produced by seismic isolation devices changes the overall damping characteristics of structures,and the influence of non-classical damping increases with uneven arrangement positions and energy dissipation ability of seismic isolation devices;increasing with the equivalent damping coefficient of seismic isolation devices,modal damping ratio of structural vibration mode increases and influence of non-classical damping on structural seismic response becomes great;the bounds of approximate decoupling errors lie on bridge structural style and equivalent damping coefficient.更多还原