独塔斜拉桥的环境振动试验与分析

桥梁环境振动试验具有简单方便和花费少等优点.本文以吉林市临江门大桥为工程背景,通过动力试验,研究了该桥在天然脉动荷载作用下的固有特性.采用结构分析软件ANSYS建立全桥的空间模型,计算该桥的固有特性.有限元计算结果与动力试验结果比较吻合.结果表明,环境振动响应足以识别出该桥所感兴趣的模态,可作为该桥的有限元模型修正、损伤检测、使用状态评估和健康监测的基础.

Ambient Vibration Test and Analysis of a Single Pylon Cable-Stayed Bridge

Bridge ambient vibration test has some advantages such as simpleness, convenience and cheapness. Linjiangmen Bridge located in Jilin City of Jilin Province is taken as engineering example in this paper. The intrinsic characteristics of the bridge under natural vibration were investigated based on dynamic tests. Then the bridge intrinsic characteristics under natural vibration were calculated using the structure analysis software ANSYS. The results from finite element calculation coincide with the results from dynamic test, which demonstrates that the ambient vibration responses are sufficient for identification of most significant modes for this kind of cable-stayed bridges and can serve as the basis in finite element model updating, damage detection, bridge condition assessment and health monitoring.