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http://dx.doi.org/10.5000/EESK.2013.17.3.117

Prediction of Long Term Performance and Creep of Laminated Natural Rubber Bearings(NRB)  

Hwang, Kee Tae (Econing Co., Ltd.)
Seo, Dae Won (Research Institute of Earthquake and Disaster Prevention, Econing Co., Ltd.)
Cho, Sung Gook (R&D Center, JACE KOREA Company)
Publication Information
Journal of the Earthquake Engineering Society of Korea / v.17, no.3, 2013 , pp. 117-125 More about this Journal
Abstract
Seismic isolation has been considered and utilized in various industries as a way to prevent huge damage on to structures by large earthquakes in various industries. The laminated Laminated rubber bearings is are most frequently used in seismic isolation systems. The structural Structural safety could not be assured unless the performance of the rubber bearing is not guaranteed for the life time of the structure under the consideration that the bearing is a critical structural member to sustain vertical loads in the seismically isolated structure. However, there are few studies on the deterioration problems of rubber bearings during their service life. The long term performance of the rubber bearings was not considered in past designs of seismically isolated structures. This study evaluates the long term performance and creep characteristics of laminated natural rubber bearings that are used in seismically isolated buildings. For the this study, a set of accelerated thermal aging tests and creep tests are were performed on real specimens. The experimental results show that the natural rubber bearings would have a stable change rate of change for durability under severe environmental conditions for a long time.
Keywords
Laminated natural rubber bearing; seismic isolation system; accelerated aging; long term performance; creep;
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