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Title |
Derivation of Dynamic Characteristic Values for Multi-degree-of-freedom Frame Structures based on Frequency Response Function(FRF)
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Authors |
김소연(So-Yeon Kim) ; 김민영(Min-Young Kim) ; 이승재(Seung-Jae Lee) ; 최경규(Kyoung-Kyu Choi) |
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DOI |
https://doi.org/10.11112/jksmi.2023.27.4.1 |
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Keywords |
다자유도계 구조물; 진동대 실험; 동특성치도출; 모드벡터; FRF 해석 Multi-degree-of-freedom structure; Shaking table test; Dynamic characteristic extraction; Mode vectors; Frequency response function (FRF) analysis |
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Abstract |
In the seismic design of structures, seismic forces are calculated based on structural models and analysis. In order to accurately address the dynamic characteristics of the actual structure in the structural model, calibration based on actual measurements is required. In this study, a 4-story frame test specimen was manufactured to simulate frame building, accelerometers were attached at each floor, and 1-axis shaking table test was performed. The natural period of the specimen was similar to that of the actual 4 story frame building, and the columns were designed to behave with double-curvature having the infinite stiffness of the horizontal members. To investigate the effects seismic waves characteristics, historical and artificial excitations with various frequencies and acceleration magnitudes were applied. The natural frequencies, damping ratios, and mode shapes were obtained using frequency response functions obtained from dynamic response signals, and the mode vector deviations according to the input seismic waves were verified using the Mode assurance criterion (MAC). In addition, the damping ratios obtained from the vibration tests were applied to the structural model, and the method with refined dynamic characteristics was validated by comparing the analysis results with the experimental data.
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