Effect of rubber bearing ageing on seismic response of base-isolated steel bridges

Gu, Haosheng; 伊藤, 義人; Itoh, Yoshito; 佐藤, 和也; Satoh, Kazuya

doi:10.1016/b978-008044637-0/50242-0

Cited by 3 publications

(1 citation statement)

References 4 publications

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“…Itoh, et al [3,7] have evaluated the evolution of tensile mechanical properties (such as elongation at break and tensile strength) of different types of rubber compounds used for bridge bearings exposed to different ageing tests, including thermal oxidation, ozone, low temperature ozone, ultraviolet radiation, salt water, and acid rain. In other studies, Itoh and collaborators have estimated the variation of material properties in tension of specimens cut from rubber blocks exposed to accelerated thermal oxidation, ozone, and ultraviolet exposure [8], and evaluated the deterioration of high damping rubber through accelerated thermal oxidation to develop life prediction models [2,9]. It was found by the contributions of Itoh and collaborators that changes in rubber properties due to thermal oxidation are significantly higher than other factors [3,7,8].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Thermal Ageing on the Mechanical Properties of Natural Rubber-based Compounds Used for Rubber Bearings

Guzmán

Vásquez

Moreno

2021

J. Eng. Technol. Sci.

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Molecular changes due to high temperatures, sunlight, and oxygen, deteriorate the physical properties of rubber compounds, yielding additional crosslinks and molecular chain breakdown. Since oxidative degradation is the most important factor that determines the durability of rubber components, this study evaluated the mechanical behavior of rubber compounds exposed to accelerated thermal ageing. Therefore, three carbon black-reinforced natural rubber-based compounds typically used for rubber bearings were exposed to thermal oxidation and their mechanical properties under typical loading states were assessed through standardized tests. Significant differences were found due to thermal ageing in the compressive modulus, compression set, and creep compliance in compression, exhibiting a stiffening effect caused by additional crosslinks. However, no significant differences were observed in hardness, which is a superficial measurement and a typical test in the rubber industry to characterize rubber compounds. Therefore, the assessment of ageing in rubber bearings should not be limited to a hardness test, which is required in design standards but also addresses compressive, cyclic, and transient tests. The results obtained in this study can be considered in the design process of rubber bearings by limiting the allowable compressive stress and creep deflection due to ageing effects.

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Section: Introductionmentioning

confidence: 99%

The Effect of Thermal Ageing on the Mechanical Properties of Natural Rubber-based Compounds Used for Rubber Bearings

Guzmán

Vásquez

Moreno

2021

J. Eng. Technol. Sci.

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Seismic Performance Management of Aged Road Facilities in Korea: Part 1 — Fragility Curves

Shin,

Kim,

Song

et al. 2024

KSCE J Civ Eng

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Shear Characteristic Changes in Blended Rubber of Elastomeric Bearings due to Aging

Sun¹,

Kim²

2021

J. Korean Soc. Hazard Mitig

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Rubber bearings are widely used for seismic retrofit of bridges because they reduce the seismic force by making the vibration period of the bridge longer and distributing the seismic force to all the piers. However, they have the disadvantage of being easily aged compared to steel bearings as well as having variations in the shear stiffness. The shear characteristic changes in the blended rubber for the rubber bearings were analyzed, specifically, the aging accelerated by heat. The higher the aging temperature and longer the exposure time, the greater is the maximum stress and strain at that time, and the greater is the shear stiffness. This implies that the seismic performance gradually deteriorates due to aging as the service period becomes longer. This can provide the basis for the mechanical model of the aging bearing.

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Effect of rubber bearing ageing on seismic response of base-isolated steel bridges

Cited by 3 publications

References 4 publications

The Effect of Thermal Ageing on the Mechanical Properties of Natural Rubber-based Compounds Used for Rubber Bearings

The Effect of Thermal Ageing on the Mechanical Properties of Natural Rubber-based Compounds Used for Rubber Bearings

Seismic Performance Management of Aged Road Facilities in Korea: Part 1 — Fragility Curves

Shear Characteristic Changes in Blended Rubber of Elastomeric Bearings due to Aging

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