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Vibration analysis of damaged and undamaged steel structure systems: cantilever column and frame
Earthquake Engineering and Engineering Vibration ( IF 2.8 ) Pub Date : 2020-07-15 , DOI: 10.1007/s11803-020-0591-9
Muhammad Abuzar Khan , Kareem Akhtar , Naveed Ahmad , Feroz Shah , Naeem Khattak

This paper presents the experimental and numerical studies conducted on a steel column and a steel frame structure using free vibration analysis. The effects of damages on structures were investigated, which were simulated by introducing multiple cracks at different locations in the experimental and numerical models. The acceleration responses of the test models, were recorded through an accelerometer, and were used to calibrate the numerical models developed in finite element based software. Modal frequencies of damaged and undamaged structures were compared and analyzed, to derive relationships for damaged and undamaged structures’ frequencies in terms of crack depth. It was found that, due to the presence of cracks, the mechanical properties of a structure changes, whereby, the modal frequencies decrease. An approximately linear trend was observed for the frequency decrease with the increase in crack depth, which was also confirmed by the numerical models. The derived relationships were extended to further develop a mechanics-based damage scale for steel structures, to help facilitate structural health monitoring and screening of vulnerable structures.

中文翻译:

损坏和未损坏的钢结构系统的振动分析:悬臂柱和框架

本文介绍了利用自由振动分析对钢柱和钢框架结构进行的实验和数值研究。研究了损伤对结构的影响,并通过在实验和数值模型中的不同位置引入多个裂纹来模拟。测试模型的加速度响应通过加速度计记录下来,并用于校准基于有限元软件开发的数值模型。对损坏和未损坏结构的模态频率进行了比较和分析,以得出裂纹深度与损坏和未损坏结构的频率之间的关系。发现由于裂缝的存在,结构的机械性能改变,从而模态频率降低。随裂纹深度的增加,频率降低时观察到近似线性的趋势,这也被数值模型所证实。扩展了派生关系,以进一步开发基于机械的钢结构损伤量表,以帮助促进结构健康监测和易损结构的筛选。
更新日期:2020-07-15
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