FULL-SCALE TESTS AND ANALYTICAL MODELING OF HIGH-DAMPING RUBBER BEARINGS UNDER TWO HORIZONTAL DIRECTIONAL LOADING

Horizontal biaxial loading tests were conducted on full-scale high-damping rubber bearings (HDR) to observe its performance. Two HDRs of diameter 700mm and 1300mm were used.Hysteresis loops by biaxial loadings became more swollen than those by uniaxial loadings.Hysteresis loops in the sub axis were so singular that the maximum restoring force was given around zero displacement. In strong nonlinear state, restoring force act in circumferential direction that cause torsional deformations of HDRs. This effect resulted in an earlier failure of HDR700. A technique to identify HDR's biaxial force deformation relationship was presented and demonstrated to have good performance.