Experimental Study on the Dynamic Characteristics of Peripheral Restraining-Type Rubber Bearings

This paper describes the dynamic test results of a peripheral restraining-type rubber bearing which has adjustable damping ability. The rubber bearing is composed of a core block made of superhigh-damping synthetic rubber and a restraining ring made of high-damping rubber surrounding the core block. The rubber bearings used for the fundamental tests are 0. 3-scale models of actual bearings. The test results are compared with the test results of actual bearings. The fundamental tests reveal the various properties of the horizontal stiffness and damping ratio obtained from the hysteretic restoring force loops. The horizontal stiffness and damping ratio are not affected by amplitude and frequency over ±0. 5 shear strain amplitude. Moreover, the rubber bearing can retain its horizontal stiffness and damping ratio after the 1 000-cycle repetition test under unit shear strain amplitude. The results of the 0. 3-scale model nearly conform to the results of the actual bearing. The experimental results show that the ability of the actual bearing can be estimated by testing the 0. 3-scale model.