摘要
为了研究阻尼对梁式结构损伤识别结果的影响、提高损伤诊断和安全评估的精度,将梁式结构简化为比例阻尼系统,推导出基于单元模态应变能一阶灵敏度的解析表达式,建立了考虑比例阻尼影响的梁式结构损伤方程组及其损伤识别方法.采用混凝土简支梁数值算例模拟了6种小损伤工况,损伤识别结果表明:基于单元模态应变能一阶灵敏度的损伤指标能够识别出小损伤位置和损伤程度,最大相对误差不超过10%.分别采用包含不同位置损伤的实验室简支钢梁模型组和一座有实测损伤的梁桥验证所提方法的可行性.研究结果表明:考虑比例阻尼影响时,基于单元模态应变能的损伤识别方法可以识别出梁式结构小损伤和多损伤.
To study the effect of damping on damage identification and improve the accuracy of damage diagnosis and safety evaluation of beam type structures,the beam structure was simplified as a proportional damping system. The analytic expression of the proportional damping system was derived based on the first-order sensitivity of elemental modal strain energy. The damage equations of the beam type structures considering proportional damping were established,and the corresponding damage identification method was proposed. A concrete beam numerical model was used to simulate six cases of minor damages. The damage identification results show that the damage index based on the first-order sensitivity of elemental modal strain energy can identify micro damage locations and damage degrees,and the maximum relative error is less than 10%. The simply-supported steel beams with different damage locations in the laboratory and a real girder bridge with actual damages were used to verify the feasibility of the proposed method. The results indicate that the damage identification method based on elemental modal strain energy can identify micro-damages and multiple damages of beam type structures considering proportional damping.
作者
牛杰
王龙花
宗周红
钟儒勉
Niu Jie1 ,Wang Longhua2, Zong Zhouhong1, Zhong Rumian1(1.School of Civil Engineering, Southeast University, Nanjing 211189, China; 2.Tianjin Highway Engineering Design and Research Institute, Tianjin 300170, Chin)
出处
《东南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2018年第3期496-505,共10页
Journal of Southeast University：Natural Science Edition
基金
国家自然科学基金资助项目(51178101
51378112)
江苏省普通高校研究生科研创新计划资助项目(CXZZ13_0109)
关键词
单元模态应变能
灵敏度分析
损伤识别
比例阻尼
损伤方程组
elemental modal strain energy
sensitivity analysis
damage identification
proportionaldamping system
damage equations
