Fault Identification for Shear-Type Structures Using Low-Frequency Vibration Modes

作     者：Cuihong Li Qiuwei Yang Xi Peng 

作者机构：School of Civil EngineeringShaoxing UniversityShaoxing312000China School of Civil and Transportation EngineeringNingbo University of TechnologyNingbo315211China Engineering Research Center of Industrial Construction in Civil Engineering of ZhejiangNingbo University of TechnologyNingbo315211China 

出 版 物：《Computer Modeling in Engineering & Sciences》 (工程与科学中的计算机建模（英文）)

年 卷 期：2024年第138卷第3期

页      面：2769-2791页

核心收录：

学科分类：08[工学] 081402[工学-结构工程] 081304[工学-建筑技术科学] 0813[工学-建筑学] 0814[工学-土木工程] 

基　　金：the Zhejiang Public Welfare Technology Application Research Project(LGF22E080021) Ningbo Natural Science Foundation Project(202003N4169) Natural Science Foundation of China(11202138,52008215) the Natural Science Foundation of Zhejiang Province,China(LQ20E080013) the Major Special Science and Technology Project(2019B10076)of“Ningbo Science and Technology Innovation 2025” 

主　　题：Fault diagnosis shear steel structure vibration mode dynamic flexibility frequency sensitivity 

摘      要：Shear-type structures are common structural forms in industrial and civil buildings,such as concrete and steel frame *** diagnosis of shear-type structures is an important topic to ensure the normal use of *** main drawback of existing damage assessment methods is that they require accurate structural finite element models for damage ***,for many shear-type structures,it is difficult to obtain accurate *** order to avoid finite elementmodeling,amodel-freemethod for diagnosing shear structure defects is developed in this *** method only needs to measure a few low-order vibration modes of the *** proposed defect diagnosis method is divided into two *** the first stage,the location of defects in the structure is determined based on the difference between the virtual displacements derived from the dynamic flexibility matrices before and after *** the second stage,damage severity is evaluated based on an improved frequency sensitivity *** innovations of this method lie in two *** first innovation is the development of a virtual displacement difference method for determining the location of damage in the shear *** second is to improve the existing frequency sensitivity equation to calculate the damage degree without constructing the finite *** has been verified on a numerical example of a 22-story shear frame structure and an experimental example of a three-story steel shear *** on numerical analysis and experimental data validation,it is shown that this method only needs to use the low-order modes of structural vibration to diagnose the defect location and damage degree,and does not require finite element *** proposed method should be a very simple and practical defect diagnosis technique in engineering practice.