基于应变模态差的连续梁损伤识别方法研究与应用
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摘要
目前中国许多地区都在大规模修建桥梁和高架桥,桥梁成为交通工程中必不可少的一部分,它的健康运行关系到国家的经济、人民的生命财产以及社会的稳定。为了保证桥梁的健康运营,对桥梁进行监测已成为必不可少的关键环节。主要以应变模态为基础,采用应变模态差作为损伤识别的指标对桥梁进行损伤识别,通过有限元软件模拟三跨连续梁的损伤状况,利用应变模态差对其损伤位置进行识别。结果证明:应变模态差能够有效识别结构的损伤位置,并借助此方法对现有桥梁的损伤情况进行评估。
Bridges and viaducts are being built in many areas of China and have become indispensable part of the traffic engineering. Their security operation is closely related to the country's economy, people's life and property, and social stability. In order to ensure the security operation of bridges, bridge monitoring has become an indispensable key link. With the strain mode and the strain mode difference as the indicators of damage identification of bridges, the finite element software was used to simulate the damage states of a three-span continuous beam and to identify the damage locations. The results showed that the strain mode difference can effectively identify the damage locations of structures and to evaluate the damage of existing bridges.
Bridges and viaducts are being built in many areas of China and have become indispensable part of the traffic engineering. Their security operation is closely related to the country's economy, people's life and property, and social stability. In order to ensure the security operation of bridges, bridge monitoring has become an indispensable key link. With the strain mode and the strain mode difference as the indicators of damage identification of bridges, the finite element software was used to simulate the damage states of a three-span continuous beam and to identify the damage locations. The results showed that the strain mode difference can effectively identify the damage locations of structures and to evaluate the damage of existing bridges.
引文
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[4] 郭健,徐洪东,江定宇,等.基于小波分析的跨海大桥斜拉索风致损伤识别[J].浙江工业大学学报,2017,45(6):671-676.
[5] 任鹏,周智,欧进萍.基于一阶应变模态灵敏度的结构损伤定量研究[J].振动工程学报,2016,29(6):976-982.
[6] DING B D,TANG M,SHANG Y N.Damage location identification of truss structure based on strain modal method[J].Advanced materials research,2014,919/920/921:51-57.
[7] 张则荣,樊智敏,王永岩,等.基于应变模态的振动筛上横梁疲劳损伤分析[J].机械强度,2017(5):1187-1192.
[8] 郭建,裘力奇,张新军,等.基于小波包分析的桥梁支座损伤识别试验研究[J].浙江工业大学学报,2016,44(6):695-698.
[9] 韦健,徐典,万雨田,等.应变模态在桁架结构损伤识别中的研究[J].工程建设与设计,2015(3):46-48.
[10] 范涛,曾春平,马琨.基于应变模态的直接损伤定位法[J].贵州大学学报(自然科学版),2015,32(1):94-97.
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[12] 韩红飞,周邵萍,郝占峰,等.基于应变模态差的管道损伤识别仿真[J].振动、测试与诊断,2013,33(增刊1):210-213.
[13] 李德葆,陆秋海.实验模态分析及其应用[M].北京:科学出版社,2001.