IDENTIFICATION OF THE FRICTIONAL COEFFICIENT OF THE METAL-TOUCHED TYPE OF BASE-ISOLATOR AND VERIFICATION OF ITS RESPONSE REDUCTION

Abstract

The sliding bearings are used for lightweight structures instead of the laminated rubber bearings. In many studies, the frictional coefficients of sliding bearings are assumed as less than 0.10. However, even if frictional coefficient is about 0.20, it may be effective for a big earthquake (Max. acceleration > 200Gal). In this study, the efficiencies of sliding bearings made of stainless steel are examined. The static and the dynamic frictional coefficients were identified about 0.20 and 0.10, respectively. It demonstrated experimentally and analytically that the inter-story displacements decreased to 25〜50%.