Long-period ground motions are expected to be generated by potential Nankai Trough earthquake. The high-rise buildings with long natural periods will be greatly affected. The viscous damper is a flow resistance type damper. However, while vibration energy is converted into thermal energy, the temperature of the viscous fluid increases and the damper performance decreases. The performance decrement can be evaluated by energy density. Besides, seismic response evaluation methods considering the performance decrement were also proposed. However, there is no qualitative assessment about the increased response considering the performance decrement of the viscous damper. Therefore, in this paper, the influence of the target story drift ratio, damper size, height of the building and the plasticity of the structure on the seismic response were assessed by using the absorbed energy of individual damper.
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