POD 기법을 이용한 철골뼈대구조의 모드인자 파악

초록

The proper orthogonal decomposition (POD) analysis of vibration of a steel frame structure is performed to extract modal parameters. The theoretical background of the POD method is introduced briefly, and this technique is further applied to free vibration displacements of one bay-two story steel frame structure to extract the modal parameters. From the theoretical background research, it can be verified that the POD mode shapes and principal coordinates are identical with those of the true normal modal analysis (NMA). From the POD analysis of the steel frame structure, it is found that important modal parameters such as true mode shapes, modal kinetic energy, natural frequencies, and damping ratios can be obtained for the building efficiently and in detail. Therefore, it is concluded that the POD method could be one of the useful techniques in analysis of vibration of structures.

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