Control Effect of Semi-Active Switching Oil Damper Installed in Actual High-Rise Building During Large Earthquakes

Abstract eng:
This paper estimates the dynamic characteristic, especially damping, of an actual high-rise building with two kinds of oil dampers from records of the building’s responses during large earthquakes. The building is located in Niigata prefecture, Japan, which has recently been subjected to four large earthquakes: the Mid Niigata prefecture Earthquake in 2004, the Noto Hanto Earthquake in 2007, the Niigataken Chuetu-oki Earthquake in 2007 and the Iwate-Miyagi Nairiku Earthquake in 2008. During these earthquakes, valuable records were obtained of the response of the building and behavior of the semi-active oil damper. From the observed responses, equivalent damping ratios are estimated larger than 6% in the transverse direction in which the semi-active oil dampers are applied and larger than 4% in the longitudinal direction in which the passive oil dampers are applied. Thus, high damping property of the building equipped with oil dampers is verified during earthquakes. The effect of the dampers was also discussed with reference to a seismic design model. By comparing the damping ratio added by the dampers estimated from the earthquake records with that estimated from the seismic design model with passive oil dampers, it was verified that the passive oil dampers showed almost the same results as expected, and the semi-active oil dampers showed high performance in adding damping, which was about 1.7 times as large as that expected by a passive oil damper.

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