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In this paper, a stiffness-damping identification method for a building structure is proposed when the building is subjected to earthquake ground motion. The difficulty arising in the limit manipulation in the previous method is overcome by introducing an ARX model. The weakness of small SN ratio in the low frequency range is avoided by using the ARX model and introducing new constraints on the ARX parameters. The validity of the proposed method is examined through numerical examples using simulated data and actually recorded data., Transactions of AIJ. Journal of structural and construction engineering

This paper discusses the wind tunnel tests for a tall building model having either viscous or visco-elastic damper under the turbulent boundary layer flow. The wind tunnel tests are carried out either the across- or along-wind direction for the viscous and the visco-elastic damper systems, respectively. This wind test set-up includes a special measurement system to obtain the damper hysteetic loop, then the response property of damper and system are discussed by the referring to the obtained loop. In case of the severe wind speed, the response of visco-elastic system is smaller than the viscous system because the stiffness of visco-elastic damper contributes to the stiffness of system.