基于跨模型模态应变能指标的简支梁结构损伤识别  

Damage identification of simply supported beam based on thecross-modal strain energy index

作　　者：刘起琪 伍晓顺 LIU Qiqi;WU Xiaoshun(School of Civil Engineering and Surveying&Mapping Engineering(Nanchang),Jiangxi University of Science and Technology,Nanchang 330013,China)

机构地区：[1]江西理工大学土木与测绘工程学院(南昌),江西南昌330013

出　　处：《贵州科学》2025年第2期71-76,共6页Guizhou Science

基　　金：江西省自然科学基金资助项目(20202BAB204028)。

摘　　要：为了提高梁结构损伤识别的准确性。在传统模态应变能指标MSECR和MSEBI的基础上,提出利用未损振型和损伤振型相结合的方式构造出一种新的模态应变能——跨模型模态应变能指标(CMSEI)。以某简支梁结构为例,设置单损伤和多损伤工况,通过噪声和模态数量两种因素来考察传统模态应变能指标MSECR和MSEBI与跨模型模态应变能指标CMSEI损伤定位效果。分析结果表明:与传统模态应变能指标MSECR和MSEBI相比,跨模型模态应变能指标CMSEI在不同的工况下均能准确定位出损伤构件的位置且具有较强的抗噪鲁棒性。In order to improve the accuracy of damage identification in beam structures,this paper proposes a new modal strain energy index called cross-modal strain energy index(CMSEI)by combining undamaged and damaged modal shapes on the basis of the traditional modal strain energy indicators,MSECR and MSEBI.Taking a simply supported beam as an example,single and multiple damage scenarios are set up to investigate the damage location performance of MSECR,MSEBI,and CMSEI under the influence of noise and modal quantity.The analysis results indicate that compared with MSECR and MSEBI,the cross-modal strain energy index(CMSEI)can accurately locate the damaged components under different working conditions,and exhibits strong robustness against noise.

关 键 词：损伤定位 模态应变能 简支梁 结构健康监测 模态识别 

分 类 号：TU41[建筑科学—岩土工程]