RESPONSE CONTROL PERFORMANCE OF HYBRID MASS DAMPER WITH CONVERTIBLE ACTIVE AND PASSIVE MODES APPLIED TO A SLENDER TALL BUILDING

Abstract

A hybrid mass damper system with convertible active and passive modes using a hydraulic actuator has been installed to an actual slender tall building with an aspect ratio of eight constructed in Chiba prefecture. Force vibration tests and observation of behaviors against moderate wind excitations were carried out to investigate the response control performance of the mass damper system. From the analysis, it was confirmed that on the active mode due to the vibration tests, the damping factors in the 1st mode were about 8%〜11%, the satisfactory vibration control effect was obtained, and no spillover in the 2nd mode occurred. The response values of the peak and the R.M.S. accelerations under the active mode due to the seasonal wind excitation were reduced to 1/ 4.5〜1/2.0(average 1/3) in comparison with the responses in non-controlled system. Through the results obtained by these investigations, it was concluded that the mass damper system was quite effective for the response control of the slender tall building to wind loads.