ATTEMPT TO ESTIMATE THE CREEP CHARACTERISTICS OF THICK LAMINATED RUBBER BEARINGS INSTALLED IN A VIBRATION ISOLATION BUILDING BASED ON LONG-TERM OBSERVATION RESULTS

Creep characteristic of the thick laminated rubber bearing made of natural rubber installed in the actual vibration isolation building for 55.2 years could be estimated by using existing measurement data and newly measurement data. Creep measurement data sets were examined by simple regression equation of recommended by JIS K6410-2. Regression analysis showed that the average creep displacement characteristics could be described by a power law. Average creep displacement of the thick laminated rubber bearings installed the building for 60 years was estimated 3.4 mm by the regression equation. The method of JIS K6410-2 is useful for forecasting creep displacement.