【摘要】 结构模态参数识别是结构健康监测领域研究的重点.基于随机子空间法理论,在环境激励下对某钢管混凝土拱桥拱肋进行模态参数识别,得到该桥拱肋的固有频率、阻尼比和振型等模态参数;用Midas-Civil有限元软件建立该桥梁的计算模型;对实测结果和计算结果进行对比,验证识别结果的可靠性.试验结果可作为该桥梁的损伤识别、使用状态评估和健康监测的基础.更多还原

【Abstract】 Modal parameter identification is the focus of research in the field of structural health monitoring.Based on stochastic subspace method,modal parameter identification of arch rib under ambient excitation was carried out for a arch bridge with concrete-filled steel tubes.Its natural frequency of arch rib,damping ratios and vibration modal parameter were obtained,and the Midas Civil finite element software was used to establish the mathematical model of the bridge.Measured and calculated results were compared,so that the reliability of the identification result has been verified.The experimental result can be used as a basis for damage detection,condition assessment,and health monitoring of the bridge.更多还原