MECHANICAL PROPERTIES OF TIRE CHIPS AND MITIGATION OF LIQUEFACTION AND SEISMIC ISOLATION BY APPLYING TO FOUNDATION SOILS OF DETACHED HOUSES

A new seismic isolation system,namely the prestress rubber isolator(PRI,Chinese patent application number:200910174415x),is introduced.The basic principle of this new isolator is: making all or part of vertical deformation of isolator be finished in advance by exerting a longitudinal pre-compressional stress on the rubber isolator with flexible cables, the prestress tension cables become loose because of unloading after the exerting of superstructure loads,and the loose cables can limit the horizontal displacement and resist the tension of isolator. The calculation formula of horizontal stiffness of isolator is derivated,and the mechanical properties are researched. The research results show that:besides the horizontal isolating property of common rubber isolators,the prestress rubber isolator has also properties of reducing vertical deformation, limiting horizontal displacement and resisting tension.Moreover,the prestress isolator has also a certain vertical isolating affect because of the improve of rubber thickness.

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DEVELOPMENT OF CEMENT TREATED CLAY MIXED WITH SCRAP TIRE CHIPS AS NOVEL GEOMATERIAL AND STUDY OF ITS MECHANICAL PROPERTIES

Doboku Gakkai Ronbunshuu C ◽

10.2208/jscejc.63.881 ◽

2007 ◽

Vol 63 (3) ◽

pp. 881-900

Author(s):

Yoshio MITARAI ◽

Kazuya YASUHARA ◽

Yoshiaki KIKUCHI ◽

Ashoke Kumar KARMOKAR

Keyword(s):

Mechanical Properties ◽

Scrap Tire ◽

Tire Chips

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Development on Rubber Bearings for Sodium-Cooled Fast Reactor: Part 4 — Aging Properties of a Half Scale Thick Rubber Bearings Based on Breaking Test

Volume 8: Seismic Engineering ◽

10.1115/pvp2016-63105 ◽

2016 ◽

Author(s):

Tomoyoshi Watakabe ◽

Tomohiko Yamamoto ◽

Tsuyoshi Fukasawa ◽

Shigeki Okamura ◽

Takahiro Somaki ◽

...

Keyword(s):

Mechanical Properties ◽

Fast Reactor ◽

Seismic Isolation ◽

Hysteresis Loops ◽

Natural Period ◽

Isolation System ◽

Rubber Bearing ◽

Aging Properties ◽

Rubber Bearings ◽

Effects Of Aging

A seismic isolation system composed of a thick rubber bearing and an oil damper has been developed for Sodium-Cooled Fast Reactor. One of the advantages of the isolation system is the use of thick rubber bearings to ensure the longer vertical natural period of a plant, thereby mitigating seismic loads to mechanical components. Based on many previous studies, rubber bearing technology has progressed, but test data regarding the effect of aging is not sufficient. Moreover, there is no data on the limits of linear strain and breaking behavior for thick rubber bearings after aging. This paper focused on the aging properties of thick rubber bearings, such as basic mechanical properties and ultimate strength. An aging test of thick rubber bearings was conducted using 1/2-scale (800mm diameter) and 1/8-scale (200mm diameter) rubber bearings. Aging of the rubber bearings was reproduced using thermal degradation, in which the target of aging periods were 30 and 60 years. The hysteresis loops of the thick rubber bearings after aging were obtained through horizontal and vertical static loading tests, and the effects of aging were evaluated by comparison with the initial mechanical properties. In addition, for the purpose of further research, the effect of scale by aging was clarified to compare the mechanical properties between the 1/2-scale and 1/8-scale rubber bearings.

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