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Effects of thermal aging on mechanical properties of laminated lead and natural rubber bearing

  • Kim, Dookie (Civil and Environmental Engineering, Kunsan National University) ;
  • Oh, Ju (Korean Intellectual Property Office) ;
  • Do, Jeongyun (BK21 Plus Glocal Geo-Environmental Engineering Research Team, Kunsan National University) ;
  • Park, Jinyoung (Institute of R&D, UNISONeTech Co., Ltd.)
  • Received : 2013.04.08
  • Accepted : 2013.10.26
  • Published : 2014.02.25

Abstract

Laminated rubber bearing is very popular base isolation of earthquake engineering pertaining to the passive structural vibration control technologies. Rubber used in fabricating NRB and LRB can be easily attacked by various environmental factors such as oxygen, heat, light, dynamic strain, and organic liquids. Among these factors, this study carried out thermal aging test to investigate the effect of thermal aging on the mechanical properties of laminated rubber bearings in accelerated exposure condition of $70^{\circ}C$ temperature for 168 hours. The compressive-shear test was carried out to identify the variation of compressive and shear properties of the rubber bearings before and after thermal aging. In contrast to tensile strength and elongation tests, the hardness of rubber materials showed the increasing tendency dependent on exposure temperature and period. Based on the test results, the property changes of rubber bearing mainly aged by heat are quantitatively presented.

Keywords

laminated bearing;lead rubber bearing;natural rubber bearing;thermal aging

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