摘要
针对土木工程中结构实测得到的模态信息少,结构损伤识别方法对噪声敏感且依赖高精确度有限元模型等问题,提出利用移动质量-频率曲线识别结构损伤的方法。首先,在结构上附加移动质量块,获得结构频率关于附加质量位置的关系曲线;然后,建立结构近似有限元模型,通过计算实际模型与近似有限元模型之间的质量-频率曲线的相关性,建立目标函数进行优化;最后,利用变截面简支梁结构进行数值模拟。结果表明:在模型存在较大误差情况下,该方法仍能够准确识别损伤位置,验证其具有较高的适用性。
In civil engineering, the measured modal information in practice is less, and damage identification methods usually are sensitive to noise and require high accurate finite element models. Considering those problems, this paper proposes a structural damage identification method based on the correlation curves of moving masses and structural frequencies. Firstly, the mobile mass block is added on structure to obtain the relationship curves between its positions and the structural frequencies. Secondly, the approximate finite element model of the structure is established, and then the objective function is established to optimize the structural damages by calculating the correlation of the frequencies curve of the actual model and the approximate finite element model. Finally, The validity of the method is verified by numerical simulation of a simply supported beam with variable cross-sections. The results show that damage locations can be identified accurately even with large model errors, and the method has high applicability.
作者
张青霞
?UKASZ Jankowski
ZHANG Qingxia;LUKASZ Jankowski(School of Civil Engineering,Dalian Minzu University,Dalian 116600,China;Smart-Tech Centre,Institute of Fundamental Technological Research,Polish Academy of Sciences,Warsaw 02-106,Poland)
出处
《中国测试》
CAS
北大核心
2019年第3期1-6,共6页
China Measurement & Test
基金
国家自然科学基金项目(51108066)
大连民族大学自主基金(wd01124)
辽宁省教育厅项目(L2015134)
辽宁省自然基金指导计划(20180551205)
关键词
结构健康监测
损伤识别
目标函数
频率
structural health monitoring
damage identification
objective function
frequency
