水工混凝土结构损伤诊断模态指标敏感性研究  

Sensitivity study on damage diagnosis modal index of hydraulic concrete structure

作　　者：程琳[1,2] 秦全乐 仝飞 CHENG Lin;QIN Quanle;TONG Fei(State Key Laboratory of Eco-hydranlics in Northwest Arid Region of China,Xi'an University of Technology, Xi'an 710048,China;State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University,Nanjing 210098,China)

机构地区：[1]西安理工大学省部共建西北旱区生态水利国家重点实验室,陕西西安710048 [2]河海大学水文水资源与水利水电工程科学国家重点实验室,江苏南京210098

出　　处：《地震工程与工程振动》2018年第6期126-136,共11页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金项目(51409205;51579085);博士后自然科学基金项目(2015M572656XB);陕西省博士后自然科学基金项目;水文水资源与水利工程科学国家重点实验室开放研究基金项目(2014491011)~~

摘　　要：根据实测振动数据进行结构的模态参数识别,应用相关模态指标评价结构的损伤状态,已在结构健康监测领域广泛应用。研究将基于振动的结构损伤诊断方法应用于水利工程领域具有重要理论意义和实际工程应用价值。本文针对水工混凝土结构及其振动响应特征,研究了结构损伤诊断的常用模态指标的计算方法,对几种典型模态指标对水工混凝土结构损伤的敏感性进行了研究。采用三种不同的激励信号,根据有限元动力时程分析,计算带缝重力坝的振动响应,并计算各种模态指标。通过对比发现坐标模态置信因子(coordinate modal assurance criterion,COMAC)和Lipschitz指数对结构损伤的敏感性更高。通过某重力坝一个坝段的物理模型,进一步验证了COMAC和Lipschitz指数的损伤敏感性。本文相关研究成果可为应用模态指标进行水工混凝土结构损伤诊断的研究与应用提供参考。According to the measured vibration data, the modal parameters of the structure are identified, and the damage state of the structure is evaluated by using the relevant modal parameters. It has been widely applied in the field of structural health monitoring. It has important theoretical significance and practical engineering application value to apply the vibration based structural damage diagnosis method to the field of water conservancy engineering. Aiming at the characteristics of hydraulic concrete structure and its vibration response, the calculation method of common modal parameters for structural damage diagnosis is studied. The sensitivity of several typical modal indexes to damage of hydraulic concrete structure is studied. Based on the finite element dynamic time history analysis, three different excitation signals are used to calculate the vibration response of a heavy dam with slit, and all kinds of modal indexes are calculated. It was found that coordinate modal assurance criterion(COMAC) and Lipschitz index were more sensitive to structural damage. The damage sensitivity of COMAC and Lipschitz index is further verified by the physical model of a dam section of a gravity dam. The relevant research results in this paper can provide reference for the application of modal index in the research and application of the damage diagnosis of hydraulic concrete structures.

关 键 词：水工混凝土结构 损伤诊断 坐标模态置信因子 Lipschitz指数 敏感性 

分 类 号：TV32[水利工程—水工结构工程]