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基于单元模态应变能法的桥梁结构损伤识别研究
引用本文:王根会,胡良红.基于单元模态应变能法的桥梁结构损伤识别研究[J].铁道学报,2006,28(3):83-86.
作者姓名:王根会  胡良红
作者单位:兰州交通大学,土木工程学院,甘肃,兰州,730070
基金项目:兰州交通大学校科研和教改项目;甘肃省科技厅科研项目
摘    要:桥梁结构损伤识别是对桥梁结构进行安全性评定的一个重要环节。本文首先根据桥梁结构损伤前后动力特性分析,导出由于单元损伤引起的结构模态振型的改变系数;然后,运用结构局部损伤因子法建立单元损伤敏感的指示因子,推导出单元损伤前后的单元模态应变能的变化,并对损伤单元与未损伤单元之间的关系进行了研究。最后,以单元模态应变能的变化率作为损伤定位的判别参数,对桥梁结构损伤定位的识别方法进行了研究,并以一座装配式预应力钢筋混凝土系杆拱桥作为工程实例,通过其在不同损伤情况下计算结果和实测结果的分析和讨论,说明该方法能够比较准确地对结构损伤进行定位识别,同时也证明本文研究方法的正确性和有效性。

关 键 词:单元模态应变能  桥梁结构  损伤识别痧
文章编号:1001-8360(2006)03-0083-04
收稿时间:2006-01-05
修稿时间:2006-02-27

Study on Damage Identification of Bridge Structure Based on the Method of Element Modal Strain Energy
WANG Gen-hui,HU Liang-hong.Study on Damage Identification of Bridge Structure Based on the Method of Element Modal Strain Energy[J].Journal of the China railway Society,2006,28(3):83-86.
Authors:WANG Gen-hui  HU Liang-hong
Institution:School of Civil Engineering. Lanzhou Jiaotong University, Lanzhou Gansu 730070, China
Abstract:Damage identification of bridge structures is an important link in bridge structure safety detection.Based on the analysis of the dynamic characteristics of the structure before and after damaging,the change coefficients of the structural vibration mode are deduced from element damages.According to the factorization method of local damages of the structure,indicating factors sensitive to element damages are established to deduce the change of the elemental modal strain energy before and after element damaging.The relation between damaged elements and undamaged elements is studied.Taking the change rates of the element modal strain energy as parameters for judgement of damage locations,the method of bridge structure damage location identification is studied.A PC tied arch bridge is studied as an example.Calculation results and measured results under different damaging situations are analyzed.It is seen that the proposed method is able to identify damage locations accurately and effectively.
Keywords:element modal strain energy  bridge structure  damage identification
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