ESTIMATION OF CREEP BEHAVIOR OF THICK RUBBER BEARINGS FROM 47 YEARS OBSERVATION IN AN ACTUAL BUILDING

Abstract

47 years long creep characteristics of thick natural rubber bearings could be estimated by using the existing measured creep displacement data of an actual vibration isolation building, which was established in 1966. From the estimated creep characteristics, it was confirmed that increment rate of creep displacement is gradually decreased with time. Therefore the time dependent formula for creep recommend in JIS K6410-2:2015 was applied to the estimated creep characteristics. As the formula matched the actual creep characteristics, so it was possible to predict the creep displacement 60 years after the start of measurement using this formula.