尤溪水东大桥动力特性分析  

Analysis of the dynamic characteristics of Shuidong Bridge in Youxi County

作　　者：陈世九[1] 

机构地区：[1]福建船政交通职业学院,福建福州35000

出　　处：《南昌工程学院学报》2013年第4期27-31,共5页Journal of Nanchang Institute of Technology

摘　　要：福建省尤溪县水东大桥水东村侧主桥为四跨预应力混凝土V形墩连续刚构桥,为检测桥梁结构的动力性能,进行了脉动试验和跑车试验,得到了桥梁结构的前几阶自振频率、阻尼比、振型特点,以及在不同跑车工况下的冲击系数和竖向加速度响应幅值.同时采用有限元软件Midas Civil建立了有限元模型,将有限元动力分析结果与动载试验结果进行了比较,对桥梁的工作状况和受力性能作出评判:该桥实际刚度较大,竖向一阶频率与同类结构相近,结构易发生顺桥向侧移;行车较舒适,结构偏安全.The main part of Shuidong Bridge in Youxi County is a four-span prestressed continuous rigidframe bridge with V-type piers.In order to test the dynamic performance of the bridge structure,the paper carries out a vibration test and a uniform motion test of vehicle,in which the natural frequency of vibration,the damping ratio,vibration characteristics,as well as the impact factor and the vertical acceleration response amplitude under different vehicle conditions are obtained.Besides,by using Midas Civil,a finite element software,a finite element model is established,in which the data from the finite element dynamic analysis is compared with that of dynamic loading test,getting a judgment on the working condition and the mechanical behavior of the bridge.The result shows that with a rather high stiffness and a first order vertical frequency close to similar structures,the structure tends to have lateral movement in the longitudinal direction,a preferred structure for comfortable driving and safety.

关 键 词：V形墩 连续刚构 动力分析 动载试验 

分 类 号：U44[建筑科学—桥梁与隧道工程]