A STUDY ON EFFECT OF CUSHIONS INSTALLED IN A SEISMICALLY ISOLATED HIGH-RISE STRUCTURE UNDER LONG-PERIOD GROUND MOTIONS

Abstract

As a provision for excessive inputs, effect of cushions installed in a seismically isolated high-rise structure was studied. Results were as follows; 1) Though optimum parameters for various types of cushions were different on their restoring characteristics, effects of them were similar. 2) Common appropriate parameters against 3 kinds of inputs considered can be found. 3) Required force of cushions was not more than 5 % of the building weight. 4) Energy absorption of cushions was slightly effective. 5) The effect of cushions could be seen as increasing of 7-8 or 10-odd% of damping factor of seismic isolation layer.