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Title |
System Identification and Calibration of Multi-Story Frame Structures Based on FFT Analysis Using Acceleration Data
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Authors |
김민영(Min-Young Kim) ; 박성호(Sung-Ho Park) ; 최경규(Kyoung-Kyu Choi) |
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DOI |
https://doi.org/10.11112/jksmi.2024.28.6.116 |
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Keywords |
골조 구조물; 진동대 실험; 전달함수; 시스템 식별; 강성 도출; 교정 Frame structure; Shaking table test; Transfer function; System identification; Stiffness derivation; Calibration |
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Abstract |
This study suggested a method to derive the dynamic characteristics and the stiffness of multi-story frame structures using acceleration data.
To achieve this, A Four-frame structure was fabricated, and shaking table tests were conducted. To evaluate the effects of seismic excitations characteristics, two recorded seismic excitations and one artificial seismic excitation with various frequencies were applied. The natural frequencies, damping ratios and mode shapes were derived from acceleration measurements using transfer function. And using these dynamic characteristics, Stiffness was calculated and calibrated. In addition, the derived dynamic characteristics and stiffness were applied to a four-degree-of-freedom (4-DOF) analytical model. An elastic time-history analysis was conducted, and the results were compared with the shaking table test results to validate the reliability of the method.
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