POD 기법과 풍진동 데이터를 이용한 고층구조물의 모드식별

초록

In this paper, the Proper Orthogonal Decomposition (POD) method, which is a statistical analysis technique to find the dynamic characteristics of a random field, is adapted to identify the modal parameters of a tall chimney structure. A wind force time history, which is applied to the structure, is obtained by a wind tunnel test of a scale down model. The POD method is applied on the wind force induced responses of the structure, and the true normal modes of the structure are obtained. The modal parameters including, natural frequency, mode shape, damping ratio and kinetic energy of the structure can be estimated accurately by using the POD method. With these results, it may be concluded that the POD method can be applied to obtain accurate modal parameters from the wind-induced structural responses.

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