원형 실린더 구조물의 풍방향 공력감쇠비 산정
Estimation of Along-wind Aerodynamic Damping Ratio of Circular Cylinder Structure
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초록
풍방향 공력감쇠는 항상 정감쇠 형태로 나타나기 때문에 구조물 진동을 더욱 안정화하는 경향이 있다. 준정상 가정에 의하여공력감쇠를 예측할 수 있는 이론적 모델은 풍방향 공력감쇠의 발현특성을 모사하고, 발현에 영향을 미치는 영향인자를 설명하고 있다. 본 연구에서는 공탄성 실험을 통해 얻어진 계측응답으로부터 추정된 풍방향 감쇠를 이론적 풍방향감쇠와 비교하여 준정상 가정으로부터 구해진 이론적 모델의 정합성을 평가하였다. 풍방향 감쇠는 최신 개발된 시스템 식별기술인 가상동적가진기에 의한 방법을 이용하여 구한다. 본 연구결과로부터 풍방향 공력감쇠는 준정상가정에 의한 이론적 모델과의 차이를 보이며, 이것은 주로 높이별, 평균풍속에 따른 난류강도의 크기에 의하여 영향을 받는 것으로 나타났다.
Abstract
In the light of its positive damping property, along-wind aerodynamic damping is recognized to have a positive role soas to stabilize the wind induced vibration of tall building structure. The theoretical model developed to predicts aerodynamic dampingunder the assumption of quasi-steady state demonstrates the occurrence mechanism of aerodynamic damping and describes theinfluence factors affecting the formation of the damping. In this study, the along-wind aerodynamic damping identified from themeasured acceleration responses acquisited through the aeroelastic model test with variant wind speed was compared with thetheoretical damping in order to evaluate the reliability of the model. Aerodynamic damping was evaluated based on a virtual dynamicshaker method which is system identification technique developed recently. From the results of this study, it is found that the windaerodynamic damping has a difference from the theoretical model, which is mainly attributed to the magnitude of the turbulence indifferent height and mean wind speeds.
참고문헌 (13)
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