基于环境激励的双曲拱桥动力试验与分析

Dynamic Test and Analysis of Double Curved Arch Bridge Based on Environmental Incentives

基于环境激励下对某钢筋混凝土双曲拱桥进行动力试验,运用随机子空间法和峰值法进行模态分析,获得该桥的模态参数,并与有限元软件Midas Civil理论计算结果对比,两者基本吻合.实测频率低于有限元计算频率,说明桥梁刚度较低.试验表明环境激励响应能够识别出该桥的模态参数,结果可以作为该桥的有限元模型修正、损伤检测、使用评估和健康监测的基础.

Dynamic tests of double curved arch bridge are based on environmental incentives. The stochastic subspace identification method and the peak value method are used for modal analysis,and bridge modal parameters are obtained. The results have been compared with those of the finite element software Midas Civil, and they are essentially consistent. The measured frequency is lower than that of the finite element calculation. That is to say,the bridge stiffness is lower. The tests show that the bridge modal parameters can be identified in the environmental stimulus response. The identified dynamic properties can be served as the basis in the finite element model updating, damage detection, condition assessment and health monitoring of the bridge.