液体黏滞阻尼器与双曲面球形减隔震支座联合应用研究

Study of Combined Application of Fluid Viscous Damper and Double Curvature Seismic Isolation Bearing

以某城际铁路105 m简支系杆拱桥为工程依托,采用液体黏滞阻尼器与双曲面球形减隔震支座联合作用方式,对结构进行罕遇地震下的抗震设计,以了解二者联合应用于减隔震设计时的特性。利用Midas/Civil软件,采用非线性时程分析方法,对液体黏滞阻尼器与双曲面球形减隔震支座分别应用于结构的减震效果,以及二者联合应用时的减震特性分别进行了分析。分析结果显示,液体黏滞阻尼器的减震效果要优于双曲面球形减隔震支座。在给定的减震目标下二者联合应用时,液体黏滞阻尼器的吨位及结构墩顶水平力均较单独使用有所降低,对阻尼器的布置及结构的抗震设计是有利的;双曲面球形减隔震支座对地震能量耗散小,支座的摩阻系数提高时虽然增大了地震能量消耗比,但增大了结构墩顶水平力与震后残余位移,对结构抗震是不利的;二者联合应用时,应结合设防结构自身特点与减隔震设计目标,选取合适的设计参数。

With reference to an intercity railway simply supported tied arch bridge of 105 m span, seismic design is conducted with fluid viscous damper and double curvature seismic isolation bearing to cope with rare earthquake. Midas/Civil software and nonlinear time history analysis method are employed to analyze shock absorption effect of fluid viscous damper and double curvature seismic isolation bearing. The results show that the effect of the damping fluid viscous dampers is superior to that of the double curvature seismic isolation bearing. Given specific vibration protection target, both the size of the fluid viscous damper and the pier top horizontal force are reduced to a certain degree when the two shock absorbing devices work together,which benefits seismic design and damper arrangement. The bearing dissipates little seismic energy,and when the bearing friction coefficient increases the bearing absorbs more seismic energy. But the structural pier top horizontal force and residual displacement after the earthquake are increased,which is detrimental to the seismic. In case of the combination of the two, appropriate design parameters should be selected based on structural characteristics and design goal.