The Development of Laminated Rubber Bearings Applicable to the Base Isolation of Light Weight Wooden Houses

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The goal of this research project was to improve the stability of laminated rubber bearings to the extent that they could support such lightweight structures as wooden houses that are base isolated from the ground motion in case of a large earthquake.In the early phase of this research project, emphasis was placed on the analytical study to clarify the shear, bending, and axial stiffness associated with hollow circular rubber bearings that were used for this purpose. The aim of the experimental studies was to validate the analytical prediction and evaluate the precision of the obtained formulas.The coherence between the analytical and experimental studies for the hollow circular rubber bearings was the basis on which the buckling tests in the next phase were conducted and their post-analytical studies were also carried out. As a result of those sequential tests and analyses, the author successfully constituted a geometrically nonlinear model that could well describe the post buckling behavior of test specimens.The author proved that the deferential equation of the buckling model was identical to the nonlinear vibration model for a pendulum with large amplitude. Therefore, the solution for the model is expressed in terms of Jacobi's elliptic integrals.This model revealed that there is a required condition that certifies the post-buckling stability of the shear-bending columns in general. This theoretical finding leads to the invention that has a superb post-buckling stability that will satisfy the goal of this research project.