抄録
The creep characteristics of laminated rubber bearings in actual base-isolated building are estimated by monthly measurements of the temperature and deformation of rubber bearings using multi-micrometer since 1986. Furthermore, hourly high-precision automatic measurements of deformation and temperature have been started since 1993 using newly-developed laserdisplacement sensors and thermocouple. The spring constant variations of laminated rubber bearings for eleven years are estimated growing stiff more than initial conditions by static tests of aging small laminated natural rubber bearings for maintenace and actual rubber bearings in base-isolated building.
