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http://dx.doi.org/10.12652/Ksce.2011.31.4A.303

Experimental Study on Ultimate Tensile Failure Properties of Laminated Rubber Bearings  

Oh, Ju (유니슨이앤씨(주) 기술연구소)
Jung, Hie-Young (서울시립대학교 토목공학과)
Publication Information
KSCE Journal of Civil and Environmental Engineering Research / v.31, no.4A, 2011 , pp. 303-309 More about this Journal
Abstract
Laminated rubber bearing is the most commonly used device for seismic base isolation of bridge structures. It is important to know performance and behavior characteristics of the laminated rubber bearings. The main evaluation factors of the rubber bearing are classified as compressive, shear and tensile behavior characteristics. The reference data of compressive and shear characteristics are rich, but the reference data of tensile characteristics is scarce. In this study, tensile test results of the rubber bearing with variation of shape factor and shear deformation are investigated for mechanical property. When tensile deformation in normal condition is increasing, tensile cycle behavior curve becomes non-linear and tensile breaking point is 300%. On the other hand, tensile breaking point is shear deformation condition is about 40%. Furthermore, when shape factor is lower, tensile breaking point is decrease. This results mean that tensile breaking point is decreased in triaxial tensile deformation because of cracks caused by internal void of the rubber bearings. This experimental data can be used as the reference data of tensile characteristics for designing seismic isolation of structures.
Keywords
laminated rubber bearing; seismic isolation; tensile breaking; shape factor; void;
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