基于应变模态的结构损伤定位方法

英文篇名：Damage localization of changes based on the strain modes for simply supported beam
中文刊名：世界地震工程
英文刊名：World Earthquake Engineering
作者：李军 ; 于德栋 ; 白会人
英文作者：LI Jun1YU De-dong2BAI Hui-ren3(1.State Key Laboratory of Structural Analysis for Industrial Equipment ; Dalian University of Technology ; Dalian 116024 ; China ; 2.Dalian Development Area Kingswealth Group Construction Real Estate Co.Ltd ; China ; 3.College of Civil andArchitectural Engineering ; Dalian University ; Dalian 116622 ; China)
中文关键词：简支梁 ; 位移模态 ; 应变模态 ; 损伤识别
英文关键词：simply supported beam ; displacement mode ; strain mode ; damage detection
出版日期：2007-03-30
机构：大连理工大学工业装备结构分析国家重点实验室,大连经济技术开发区金源房地产开发有限公司,大连大学建筑工程学院辽宁大连116024,辽宁大连116600,辽宁大连116622
年：2007
期：01
出版单位：世界地震工程

摘要

针对简支梁的单一位置及其多位置损伤,利用结构有限元分析软件计算得到简支梁的位移模态,再通过应变和位移之间具有一阶导数的关系,对简支梁进行了应变模态分析。结果表明,应变模态对损伤比较敏感而位移模态对损伤不够敏感;当损伤发生在应变模态的节点处时,损伤不易被识别,但是可以结合多阶应变模态进行损伤识别。最后对应变模态法的工程实用性进行了评价。
Strain mode analysis is a damage identification method which is sensitive to damage location and damage degree.It is meaningful for damage detection and health monitoring of the structures.In this paper,displacement mode of a simply supported beam is calculated by using finite element software,and then strain modes of the beam for single-position damage and multi-position damage are carried through one-order differential relationship between strain and displacement respectively.The results show that strain mode is more sensitive to damage than displacement mode.From the results of the multi-position damage,damage location would be difficult to identify when it is situated in the nodes of the strain mode,but it can be overcomed by combining multi-order strain modes to identify damage location because the damage is impossibly located on the node of every-order strain mode.The engineering practicability of the strain modal analysis is evaluated in the end.

引文

[1]Pandey A K,Biswaas M.Damage detection in structures using changes in flexibility[J].Journal of Sound and Vibration,1994,169(1):3-17.
    [2]Pandey AK,Biswaas M.Experimental verification of flexibility difference method for locating damage in structures[J].Journal of Sound and Vi-bration,195,184(2):311-328.
    [3]Pandey A K,Biswas M,Samman MM.Damage detection from changes in curvature mode shapes[J].Journal of Sound and Vibration,1991,145(2):321-332.
    [4]Shi Z Y,Law S S,Zhang L M.Structural damage detection from modal strain energy change[J].Journal of Engineering Mechanics,ASCE,2000,126(12):1216-1223.
    [5]Shi Z Y,LawS S,Zhang L M.Structural damage localization from modal strain energy change[J].Journal of Sound and Vibration,1998,218(5):825-844.
    [6]Ren W X and De Roeck G.Structural damage identification using modal data.I:simulation verification[J].Journal of Structural Engineering,2002,128(1):87-95.
    [7]Ren W X and De Roeck G.Structural damage identification using modal data.II:Test Verification",Journal of Structural Engineering,2002,128(1):96-104.
    [8]Hu X and Shenton H W.Structural damage identification using static dead load strain measurements[A].15thASCE Engineering MechanicsConference[C].Columbia University,New York,June 2-5,2002.
    [9]侯兴民,杨学山,廖振鹏,马树林.实时测量桥梁挠度[J].地震工程与工程振动,2002,22(1):67-72.
    [10]李德葆,张元润,罗京.动态应变/应力场分析的模态法[J].振动与冲击,1992,44(4):15-22.
    [11]李功宇,郑华文.损伤结构的曲率模态分析[J].振动、测试与诊断,2002,22(2):136-141.
    [12]赵媛,陆秋海.简支梁桥多位置损伤的检测方法[J].清华大学学报(自然科学版),2002,42(4):434-438.