Karakteristik Dinamik Bola Baja Sebagai Material Isolasi Seismik
Abstract. Seismic isolation systems being available recently are sophisticated technology and commonly used to reduce multi-storey building response from seismic ground motions. The simple steel ball isolation was conducted to predict the reliability of housing structures in response of seismic ground motion due to earthquake. To develop a model, the building loads are assumed as a single mass system and a vibration table as a supporting base. The steel ball isolation was installed between the mass and the table. Two houses shapes are made, that is, a split cylinder and an half ball. Sinusoidal forces were applied on vibrating table with the amplitudes of 5, 10 and 20 and the frequencies of 151 and 240 cpm. Frictions in the isolation system were measured, while movements of mass responses based on one direction displacement were recorded on scaling papers. This research reveals that the higher the vibrating table acceleration (am), the higher the percentage of damping spreads through the mass. In the range of the application of input parameters, the accelerations are reduced from 92% to 99 % for split cylinder ball’s house, and from 35% to 92 % for half-ball ball’s house. The split cylinder-ball house is much more effective to reduce acceleration than the half-ball house. Those ratios of mass acceleration responses are from one eighth to one seventh.
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