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桥梁结构损伤的振动模态检测
引用本文:邓焱,严普强.桥梁结构损伤的振动模态检测[J].振动.测试与诊断,1999,19(3):157-163.
作者姓名:邓焱  严普强
作者单位:清华大学精密计量测试技术与仪器国家重点实验室北京!100084
摘    要:首先介绍了桥梁结构损伤检测的振动模态方法的原理及其4 个要素。总结了用模态参数(固有频率、阻尼比及位移振型)进行损伤检测评估的困难,进而阐述应变模态测量的原理及其用于桥梁结构损伤检测时,相对于位移模态的优势。由于应变模态方法应用于实桥检测受到传统应变测量手段的制约,本文最后提出了一种通过相邻点振动位移的测量,推估桥梁在动载作用下的应力状态,进行实桥损伤检测的途径,并推荐一种新型低频高灵敏度传感器作为位移测量用传感器。

关 键 词:  损伤  振动测量  应变测量  模态分析

Structural Damage Detection of Bridges Using Vibration Modal Measurements
Deng,Yan,Yan,Puqiang.Structural Damage Detection of Bridges Using Vibration Modal Measurements[J].Journal of Vibration,Measurement & Diagnosis,1999,19(3):157-163.
Authors:Deng  Yan  Yan  Puqiang
Abstract:In this paper the principle of vibration mode testing for structural damage detection of bridges and its four key elements are introduced first. Considering the difficulties of damage detection based on modal parameters such as natural frequency, damping ratio, and displacement mode shape, a strain mode method is put forward. Its principle and dominance compared to the displacement mode method when applied to the structural damage detection of bridges are represented. Finally, because the application of the strain mode method to real bridges is restricted by the traditional strain measurement means, a new approach for structural damage detection of real bridges based on the estimation of the stress status of the bridges using vibration displacement measurement is discussed, and a new low frequency high sensitivity sensor is commended as the displacement sensor in the structural damage detection of bridges.
Keywords:bridge  damage  vibration  measurement  strain  measurement  modal  analysis
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