抄録
A vibration test of a 180 meter high reinforced concrete stack was conducted by means of human excitation forces at the top, and then by a vibrator at the base mat. The MIK measuring system was applied to obtain resonance curves, resonance periods and mode shapes. The information obtained was investigated from the view point of identifying a vibration system for performing simulation analysis. Based on several findings that the base mat deformations were not so negligible as assumed and that modal damping of the 1st and the 2nd mode were equally small (0.8%), when compared with that of the 3rd mode (more than 20%) where the sway of base mat is predominant, the vibration model used in design analysis was modified so as to simulate the tested behaviors. Frequency dependent patterns of the base mat deformation were calculated using newly proposed analysis method for dynamic soil-structure interaction and compared with the test results which proved to have reasonable agreement.
