FVD在等截面多跨连续梁桥减震中的应用及其效果分析  

Application of FVD in equal section multi-span continuous beam bridge seismic absorption and its effect analysis

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52-57,共6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,利用非线性动力时程分析方法来研究FVD对该桥减震性能的影响。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。通过对左右两幅桥在地震作用下时程响应结果的对比,对等截面多跨连续梁桥FVD减震效果进行了分析,并探讨了液体阻尼器的合理安装位置。分析计算结果表明,合理设置液体阻尼器可以增大结构阻尼,提高减震能力,在保证桥梁其他部位弹性工作的前提下,使梁体顺桥向位移减少70%以上,桥墩底部顺桥向弯矩减少70%以上。为预防地震时梁端与桥台背墙碰撞、落梁、桥墩弯剪破坏等地震灾害提供了有效思路和办法,对高速公路多跨连续梁桥的减震设计和工程实践具有一定的参考作用。In this study,by use of Maxwell model of fluid viscous damper（FVD） simulated by velocity dependent nonlinear unit in MIDAS finite element software,on the background of Zhangjiapo bridge,a 5×30 m equal section multi-span continuous beam bridge of Tongping highway in Hunan province,two analysis models of the right panel bridge with FVD and the left panel bridge without FVD are founded respectively.Utilizing nonlinear dynamic time course analysis,based on the comparative study of the seismic responses corresponding to the right panel bridge and the left panel bridge obtained under E2 earthquake,the seismic absorption effect of equal section multi-span continuous beam bridge with FVD was explored and the reasonable position of FVD was discussed.The analysis and calculation show that reasonably setting up viscous damper could increase the structure damping and improve the seismic absorption capacity of the bridge.The longitudinal displacement of the bridge could be reduced by more than 70% and the moment of the pier at the bottom could be reduced by more than 70%,while the other parts of the bridge work elastically.In conclusion,effective ideas and approaches were provided for preventing the beam end collision with the back wall of the abutment,the lowering of the beam,the flexure-shear failure of the pier and other earthquake disasters.Meanwhile,this work could be a valuable reference for the seismic absorption design and the engineering practice of the highway multi-span continuing bridge.

关 键 词：等截面多跨连续梁桥 减震 液体粘滞阻尼器 非线性动力时程分析 

分 类 号：U443.22[建筑科学—桥梁与隧道工程]