Ultimate properties of seismic isolation rubber bearings under horizontal biaxial loading are investigated with scaled-model testing.
It was observed that the high-damping rubber bearings was twisted by torque generated by damping factor under biaxial deformation, and showed shear-break in smaller shear strain range than in uniaxial loading.
Additionally, finite element analysis (FEM) was conducted to simulate the twisting deformation and local stress and strain. The results showed good agreement with test results, and indicated the possibility of FEM as an effective tool for prediction of failure strain of isolators in biaxial loading.
