Abstract
In this paper, evaluation method is studied for condition that the large damping forces of viscous damper act on structure locally. The response spectrum analysis method by complex modal analysis is proposed as a simplified method to evaluate seismic responses of structures with viscous dampers. A steam generator is selected as an example of structure. Seismic response accelerations by proposed method are evaluated. The evaluation results are in good agreement with those of direct integration method in the practical range of damping coefficient of viscous dampers 1〜100MNs/m. From this fact, it is confirmed that the proposed method is effective to evaluate the seismic responses of structures with large capacity viscous dampers.
