大跨径悬索桥液体黏滞阻尼器参数敏感性研究  

Parametric Sensitivity Study on Fluid Viscous Damper of Long Span Suspension Bridge

作　　者：赵国辉[1] 李宇[1] 刘健新[1] 

机构地区：[1]长安大学公路学院

出　　处：《中国安全科学学报》2011年第11期35-40,共6页China Safety Science Journal

基　　金：国家自然科学基金资助(50908014);中国博士后科学基金资助(2011M501416);陕西省交通科技项目(09-13k)

摘　　要：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。Based on nonlinear dynamic time history method,the effect of variation of fluid viscous damper＇s parameters on seismic response of long suspension bridge is studied in this paper.A long span suspension bridge is taken as an example,and the FEA（Finite Element Analysis） model of the bridge is established by considering the effect of fluid viscous damper by ANSYS.Parametric sensitivity study on damping coefficient and damping exponent is carried out.Compared with the seismic response of the bridge without using the damper,the effect of fluid viscous damper on the seismic response of the bridge is studied.The results show that,for long span suspension bridge,the primary objective of the fluid viscous damper is to reduce the beam displacement under earthquake.And the damping exponent plays a dominant role and should be set from 0.8 to 1.0,while the damping coefficient is defined by design force and the damping exponent of fluid viscous damper.By setting fluid viscous dampers in longitudinal direction of suspension bridge with suitable damping parameters,the beam displacement can be reduced effectively and little additional seismic force is introduced in the bridge.

关 键 词：悬索桥 液体黏滞阻尼器 非线性动力时程方法 参数敏感性 地震响应 

分 类 号：X915.5[环境科学与工程—安全科学]