Abstract: The?damage?identification?of?bridge?structure?is?taken?as?the?research?object;modal?strain?energy?method?and?Monte-Carlo?method?are?adopted?to?discuss?the?influence?of?the?inevitable?testing?noise?on?the?damage?location?of?bridge?structure.?The?influences?of?modal?orders,?single?damage,?multiple?damage?and?damage?locations?are?taken?into?consideration?during?the?analysis,and?the?structural?damages?are?located?according?to?the?change?ratio?of?modal?strain?energy＇with?noise.?Then,?a?case?study?of?one?continuous?bridge?is?presented?to?verify?the?effectiveness?of?the?proposed?method.?The?change?law?of?damage?identification?ratio?along?with?the?testing?noise?level?at?different?damage?degrees?and?damage?locations?is?obtained?after?10000?times?calculation?by?Monte-Carlo?method.?The?result?shows?that?the?damage?identification?ratio?is?a?more?suitable?token?of?the?damage?detection?method?and?it?is?suitable?for?the?actual?engineering?requirements.

Key words: damage identification , modal strain energy , Monte-Carlo method , identification ratio

摘要： 以桥梁结构损伤识别为研究对象,采用模态应变能损伤识别与蒙特卡罗法相结合的方法,讨论了测试噪声对 桥梁结构损伤定位的影响。在分析过程中对模态的阶数、单损伤、多损伤及损伤部位等进行了研究,依据噪声影响 下的模态应变能变化率定位结构损伤。以某连续梁桥为例验证了方法的有效性,利用蒙特卡罗法进行了1万次的 计算,得到在不同损伤程度、不同损伤位置随测试噪声水平变化的识别率。研究结果表明,损伤识别率更能表征损 伤识别方法,且符合工程实际需要。

关键词: 损伤识别, 模态应变能, 蒙特卡罗法, 识别率