Study on Environmental Deterioration of Rubber Material for Bridge Bearings

Itoh, Yoshito; Yazawa, Akio; Satoh, Kazuya; Gu, Haosheng; Kutsuna, Yukihiro; Yamamoto, Yoshihisa

doi:10.2208/jscej.2005.794_253

Cited by 5 publications

(2 citation statements)

References 10 publications

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“…Itoh et al 9) have done a series of accelerated exposure tests on Natural Rubber (NR) and Chloroprene Rubber (CR). The deterioration characteristics of those two kinds of rubbers were clarified under the environments of thermal oxidation, ozone, low temperature ozone, ultraviolet radiation, salt water and acid rain.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on Ageing Behaviors of Rubbers Used for Bridge Bearings

Itoh

Satoh

et al. 2006

Structural Eng./Earthquake Eng.

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In order to evaluate the deterioration characteristics during the lifecycle of bridge rubber bearing, a series of long-term accelerated exposure tests are performed on four kinds of rubber materials widely utilized for bridge bearings. Different degradation factors are applied in these tests, such as thermal oxidation, ozone, low temperature ozone, ultraviolet radiation, salt water and acid rain. The test duration lasts from 96 hours to more than 6,000 hours. Mechanical properties of aged rubber specimens are measured and compared. The effects of pre-strain are investigated too. The ageing behaviors of each kind of rubber are made clear. The test results are fundamental to the prediction of rubber bearings' durability.

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Section: Introductionmentioning

confidence: 99%

Experimental Investigation on Ageing Behaviors of Rubbers Used for Bridge Bearings

Itoh

Satoh

et al. 2006

Structural Eng./Earthquake Eng.

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“…Yoshida et al 5), 6) developed a mathematical model of HDR materials and proposed a three-dimensional finite element modeling methodology to simulate the behaviors of a HDR bearing numerically. Besides, a series of accelerated exposure tests were performed by Itoh et al 7), 8) on various rubber materials including HDR to investigate the degradation effects of different environmental fac-tors. It was found that the thermal oxidation is the most predominant degradation factor affecting the HDR material.…”

Section: Introductionmentioning

confidence: 99%

Long-Term Deterioration of High Damping Rubber Bridge Bearing

Itoh

Satoh

et al. 2006

JSCE JOURNAL OF STRUCTURAL AND EARTHQUAKE ENGINEERING

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In recent years, high damping rubber (HDR) bridge bearings have become widely used because of the excellent ability to provide high damping as well as flexibility. However, there are few systematic studies on the deterioration problems of HDRs during their service life, and usually the long-term performance was not considered in the design stage. In this research, through accelerated thermal oxidation tests on HDR blocks, the property variations inside the HDR bridge bearing are examined. A deterioration prediction model is developed to estimate the property profiles. Then using a constitutive model and carrying out FEM analysis, the behavior of a HDR bridge bearing during its lifespan is clarified. A design procedure is proposed that takes the long-term performance in the site environment into consideration.

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