가속도 데이터를 활용한 FFT 분석 기반의 다층 골조 구조물 시스템 식별 및 교정
System Identification and Calibration of Multi-Story Frame Structures Based on FFT Analysis Using Acceleration Data
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초록
본 연구에서는 다층 골조 구조물에 대해 가속도 데이터를 이용하여 구조물의 동특성을 도출하고 강성을 평가하는 방법을 제안하였다. 이를 위해 4층 골조 구조물을 모사하는 실험체를 제작한 후, 1축 진동대 실험을 수행하였다. 입력 지진파의 종류 및 특성의 영향을 분석하기위해 계측 지진파 2종과 인공 지진파 1종 등 총 3종류의 지진파를 사용하였고 각 지진파는 3회 반복 가력하였다. 전달함수(Transfer function), 반전력 대역폭법(Half-power bandwidth)를 이용해 구조물의 고유 진동수, 감쇠비를 식별하였고, 이를 바탕으로 구조물의 강성을 산출하고 교정하였다. 이후 도출된 동특성치, 강성을 4 자유도 해석 모델에 적용하여 시간이력해석을 수행하였다. 해석 결과는 진동대 실험 결과 등과 비교하여 신뢰성을 검증하였다.
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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