Abstract

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Author(s):: CHEN Min; LIU Chang; ZOU Yin-sheng; School of Civil Engineering and Mechanics, Central South University of Forestry and Technology

Keywords:: damping structure; optimal design; vibration isolation; vibration modal analysis; timehistory analysis

Abstract:: According to the theory of vibration isolation, optimal design method for damping structure was proposed. The authors conducted a seismic design for an 11storey frame structure in the 8 degree seismic area by the viscous dampers. Based on adjusting the storey height of isolation layer by vibration modal analysis, the viscous dampers were installed in the two bottom storeys. The selected 7 groups of acceleration timehistory curves were divided into four work conditions, the timehistory of the energy dissipation structure under the frequent earthquake was analyzed with ETABS, and the total energy consumption of damper and the maximum interstory drift under each work condition were compared. The study results show that treating the main structure and damping device as an integrated whole to design can produce more desirable energy dissipation effects. The lateral stiffness of the main structure of isolation layer can be used as the design parameter of damping devices, so that the fundamental period of isolation layer can equal to the site characteristic cycle to obtain the best energy dissipation effects.