Abstract
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.
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Acknowledgment
The authors are thankful to the reviewers for the constructive remarks that helped in the improvement of the paper. The authors would relish expressing their gratitude to the Earthquake Engineering Center of University of Engineering & Technology Peshawar, for facilitating the authors in lab experiments and providing resources for the completion of the research work presented herein.
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Khan, M.A., Akhtar, K., Ahmad, N. et al. Vibration analysis of damaged and undamaged steel structure systems: cantilever column and frame. Earthq. Eng. Eng. Vib. 19, 725–737 (2020). https://doi.org/10.1007/s11803-020-0591-9
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DOI: https://doi.org/10.1007/s11803-020-0591-9