Parametric Excitation of Circular Cylindrical Shell-Lumped Mass System Subjected to Horizontal Seismic Wave (1st Report, Experimental Investigation)

摘要

An upright stainless steel circular cylinder with a mass attached at midlength is excited seismically in the horizontal direction using a vibration table. A well-known seismic wave called El Centro 1940 NS is applied to excite the test specimen. Fourier components over 10 Hz of the seismic wave are cut off and the duration is shortened to 30%, 40%, or 50%. The eccentricity of the center of gravity of the attached mass is varied and the amplitude of the modified El Centro 1940 NS is increased incrementally. Parametric excitation is observed for each combination of eccentricity of the attached mass and time scale of the seismic wave.