抄録
The results of a vibration experiment on a 1/2 scale model of the typical stacked column, an elemental structure for the aseismic study of the block-type fuel core of a high temperature gascooled reactor, are described. The column shows nonlinear resonance with soft spring characteristics. However, the block impact response has hard spring characteristics of the gap structure system, and the maximum value increases with increasing boundary gap. An increase of the boundary gap for the top block pushes the loop of the vibrating column upwards while an increase in the weight of that block gives reverse effect. The maximum response values for the seismic input are about 4075% of those for sinusoidal input. The column damping factor is about 30% of critical damping and increases with increasing the column deflection amplitude. The results of the simulation analysis shows good agreement with the experimental ones.
