LARGE SCALE DYNAMIC FAILURE TESTS OF LOW DAMPING RUBBER BASE ISOLATORS

摘要

Two large scale dynamic tests were performed for different sized rubber base isolators that were both made of same low damping rubber with actual response velocity of seismic excitations. In each test a 220 ton mass was placed on four isolators located at the corners of the mass. The entire mass system was then placed on the large scale seismic simulator, which has dimensions of 15m by 14.5m, with a maximum velocity of 100cm/s, and a maximum displacement of 0.22m. The seismic simulator was used to drive the mass until the isolators reached failure. In the first the isolators of small second shape factor simply dropped down, but did not break. In the second test of large second shape factor however, all four isolators were completely sheared off.