学术
摘 要:
为研究损伤定位方法，完成了一个单跨两层空间钢支撑框架模型试验。通过拆除斜撑，模拟了单损伤、对称多损伤、非对称多损伤以及多层损伤四种损伤模式。采用模拟环境和力锤进行激励，对采集到的加速度响应信号，利用自然激励技术和特征系统实现算法进行损伤前后结构的模态参数识别，并通过特征灵敏度分析得到质量归一化振型。分别使用损伤指标法和损伤定位向量法进行损伤定位。结果表明，上述基于结构振动特性的损伤定位方法能够有效地判定结构损伤单元的位置。[著者文摘]
文章出处:
《工程力学》-2007年24卷1期 -62-66页
栏目信息:
分 类 号:
文献标识码:
A
文章编号:
1000-4750（2007）01-0062-05
AN EXPERIMENT ON DAMAGE LOCALIZATION OF A TWO-STORY STEEL BRACED FRAME MODEL STRUCTURE
JI Xiao-dong, QIAN Jia-ru, XU Long-he （Key Laboratory for Structure Engineering and Vibration of Education Minisity, Department of Civil Engineering, Tsinghua University, Beijing 100084, China）
Abstract:
In order to investigate damage localization, an experiment on an one-bay two-story spatial steel braced flame structural modsl was carried out. Four known damage patterns, including single, symmetric, asymmetric and multi-story damages, are simulated by removing corresponding braces. Modal parameters of undamaged and damaged structures are obtained utilizing the natural excitation technique （NEXT） in conjunction with the eigensystem realization algorithm （ERA） from acceleration responses induced by hammer impacts and simulated ambient excitation. A method based on eigen-sensitivity analysis is employed to obtain the mass-normalized mode shapes. Furthermore, the damage index method and the damage locating vectors （DLVs） method are utilized respectively to identify the damage locations. It is demonstrated that the presented vibration-based methods are effective to damage localization.[著者文摘]
Key words:
structure vibration; damage diagnosis; damage localization; steel braced-frame structure; experiment
基金资助:
北京市自然科学基金资助重点项（8041002）：国家自然科学基金重大国际（地区）合作研究项（50420120133）
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