Study on seismic performance, support system and frame construction of multistory frame with a long natural period and a corresponding high damping constant

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Characteristics of natural mode, characteristics of additional damping and seismic performance of the proposed multistory rigid frame are investigated theoretically and experimentally. The proposed multistory rigid frame consists of fixed sub multistory rigid frame, horizontally movable sub multistory rigid frame and the top connection sub frame. By numerical analyses and vibration test by using a scale model, it was found that the fundamental natural period of the proposed frame is two times longer than that of the ordinary frame with the same number of stories and the fundamental damping constant can be effectively increased by the horizontal installation of viscous dampers. Furthermore, it was estimated that the maximum acceleration and the base shearing force of the proposed frame can decrease to at least one half of the maximum acceleration and one third of the base shearing force of the ordinary frame, respectively.