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为研究液体黏滞阻尼器参数变化对大跨径悬索桥地震响应的控制效果,以某悬索桥为例,基于ANSYS有限元软件建立梁端设置液体黏滞阻尼器的结构有限元分析模型,采用非线性动力时程方法,对液体黏滞阻尼器的阻尼系数和阻尼指数进行参数敏感性分析,并与未设置液体黏滞阻尼器的结构地震响应进行对比,在此基础上研究液体黏滞阻尼器参数变化对结构地震响应的影响。结果表明:对于大跨度悬索桥,液体黏滞阻尼器的设置应以控制地震作用下梁端位移响应为首要目标,阻尼指数对减震效果影响最为显著,其值宜选取在0.8～1.0范围,并根据设计阻尼力来选择适当的阻尼系数值。设置恰当参数的液体黏滞阻尼器,可有效降低悬索桥梁端位移,且不会显著增加结构地震内力响应。
In order to study the control effect of the viscous damper parameters on the seismic responses of long-span suspension bridges, taking a suspension bridge as an example, the structural finite element model of the liquid viscous dampers is established based on ANSYS finite element software. Nonlinear Dynamic time-history method, the damping coefficient and damping index of liquid viscous damper are analyzed by parameter sensitivity, and compared with the seismic response of the structure without liquid viscous damper. Based on this, the parameters of viscous liquid damper Influence of Variations on Structural Seismic Response. The results show that for the long-span suspension bridge, the setting of the liquid viscous damper should be based on the control of the displacement response of the beam end. The damping index has the most significant effect on the damping effect. The value should be in the range of 0.8 to 1.0 According to the design damping force to choose the appropriate damping coefficient value. The liquid viscous damper with the proper parameters can effectively reduce the displacement of the suspension bridge and does not significantly increase the internal force response of the structure.