A Case of Structural Design in Which Viscous Dampers are Used to Enhance Earthquake Resisting Performance of a Building

Abstract eng:
In recent years, viscous-type, seismic energy absorption type devices have been well developed and have come into wide use in Japan, resulting in increase in use of such devices as oil dampers for high-rise buildings and for seismically isolated buildings. The viscous type devices have been employed by focusing on the fact that viscous type device is superior to hysteresis type device in that viscous type devices display damping effect even under small or medium earthquakes and in that the viscous type devices display stable performance for accumulated deformation. With regards to use of viscous type damper as energy absorption device, this paper will introduce an instance of high-rise building actually designed and constructed. In this high-rise building, the 1st basement was designed as soft first story in which dampers are collectively placed for intensive-type vibration damping. In the soft story, columns are made of 350-mm-diameter thick, high-strength steel pipes (590N/mm2 class steel) to ensure large elastic limit deformation of main frame, thus enhancing damping performance.

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