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。
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.
出处
《铁道学报》
EI
CAS
CSCD
北大核心
2006年第3期83-86,共4页
Journal of the China Railway Society
基金
兰州交通大学"青蓝"人才工程基金资助项目
甘肃省科委基金资助项目(ZS031-B25-007-G)
关键词
单元模态应变能
桥梁结构
损伤识别痧
element modal strain energy
bridge structure
damage identification
