FVD阻尼系数C和阻尼指数α对桥梁减震效果影响研究  

Analysis of the influence of FVD damping coefficient C and damping exponent α on bridge seismic absorption effect

作　　者：何杰 

机构地区：[1]湖南省通平高速公路建设开发有限公司,湖南岳阳414500

出　　处：《公路工程》2012年第6期89-92,96,共5页Highway Engineering

摘　　要：论文以湖南省通平高速公路张家坡5×30 m等截面多跨连续梁桥为工程背景,建立了其右幅桥液体粘滞阻尼器(FVD)减震与左幅桥未减震模型,其中减震桥梁模型中的FVD采用Maxwell模型,以MIDAS有限元软件中的速度相关型非线性单元模拟。为了使FVD充分发挥减震作用并使减震设计有据可依,系统讨论了FVD阻尼系数C和阻尼指数α对桥梁减震效果的影响。分析计算结果表明,随着阻尼系数的增大,梁体位移越来越小,限位作用越来越明显,抑制了梁体纵桥向位移响应;随着阻尼指数的增大,阻尼力越来越小,耗能能力也越来越弱。合理选择阻尼器参数可以使结构的位移和内力得到有效控制。On the background of Zhangjiapo bridge,a 5×30 m equal section multi-span continuous beam bridge of Tongping highway in Hunan province,by use of Maxwell model of fluid viscous damper（FVD） simulated by velocity dependent nonlinear unit in MIDAS finite element software,two analysis models of the right panel bridge with FVD and the left panel bridge without FVD are founded respectively.In order to make the best of FVD effect on seismic absorption and to make seismic absorption design more reasonable,the influence of FVD damping coefficient C and damping exponent α on bridge seismic absorption effect were discussed systematically in this study.The analysis and calculation show that with the increase of damping coefficient C,displacement of girder is smaller and the seismic absorption effect is more obvious and the longitudinal displacement response of beam is inhibited.Meanwhile,damping force issmaller and energy dissipation capacityis weaker with the increase of damping exponent α.In conclusion,the displacement and internal force of structure could be effectively controlled by reasonable choice of damper parameters.

关 键 词：等截面多跨连续梁桥 减振 液体粘滞阻尼器FVD 阻尼系数C 阻尼指数α 

分 类 号：U443.22[建筑科学—桥梁与隧道工程]