It is necessary to evaluate bending deformation of laminated rubber bearing and installation elements when the installation elements cannot be assumed to be rigid. We obtained following test results. (1) Bending stiffness have non-linearity and dependence on vertical load. (2) Additional shear deformation is induced by internal force caused by vertical load and inclination of rubber sheets. We formulated horizontal stiffness of laminated rubber bearing assuming that only compression area can bear bending moment. The formula canevaluate additional shear deformation and bending stiffness. We proposed a practicable analytical method which consider flexibility of installation elements and P-δ effect.
