Experimental Investigation on Ageing Behaviors of Rubbers Used for Bridge Bearings

Itoh, Yoshito; Gu, Haosheng; Satoh, Kazuya; Kutsuna, Yukihiro

doi:10.2208/jsceja.62.176

Cited by 12 publications

(6 citation statements)

References 12 publications

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“…12 and 13 indicate that both the shear modulus G and the Neo-Hookean constitutive parameter C NH1 of the rubber material increased exponentially as the duration of the alternation of aging and seawater erosion increased, and their fitted values agreed well with their calculated values. This indicates the rationality of formulas ( 4) and (5).…”

Section: Determination Of Neo-hookean Constitutive Parametersmentioning

confidence: 59%

“…The time-varying expressions of each of the constitutive parameters are given in formula in Fig. 11 and formula (5), which can facilitate the finite-element study of similar bearing performance and the corresponding structural analyses and provide theoretical support for lifecycle performance evaluation, design and seismic performance research of rubber bearings and offshore bridges. (5) The proposed formula for constitutive parameters are suitable for determining the Mooney-Rivlin and Neo-Hookean constitutive parameters of rubber materials used in bridge isolation bearings, which are with 120 years of service under the alternating of aging and seawater erosion.…”

Section: Discussionmentioning

confidence: 99%

“…And their results indicated that thermal oxygen aging caused the rubber material to harden, which was the dominant factor leading aging. Itoh et al [4][5][6][7] conducted a series of experimental studies on NR blocks and high-damping rubber materials. Based on the test results and experimental phenomena, they developed a model to predict the aging characteristics of natural rubber bearings (LNR) and found that thermal oxygen aging was the main factor influencing the aging high-damping rubber material.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of Alternation of Aging and Seawater Erosion on Properties of Rubber Material Used in Lead Rubber Bearing

Li¹,

Zhao²,

Ma³

et al. 2022

Journal of Renewable Materials

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An artificially accelerated alternation of aging and seawater erosion test of rubber materials used in lead rubber bearing (LRB) was performed, mainly to study the time-varying laws of rubber materials mechanical properties. Time-varying laws of the Mooney-Rivlin and Neo-Hookean constitutive parameters of rubber materials under the alternation of aging and seawater erosion were also analyzed. Results indicate that the rubber material mechanical properties were significantly affected by alternation of aging and seawater erosion. Hardness and elongation stress increased exponentially with test time. And 120 days after the test, the hardness increased by 14%, the maximum percentage increase in stress of 124.76% occurred at 100% constant elongation and the minimum percentage increase in stress of 68.32% occurred at 300% constant elongation; Tensile strength and elongation at break decreased by 44.96% and 53.09%. Besides, constitutive parameters of Mooney-Rivlin and Neo-Hookean all changed greatly with test duration. Finally, time-varying laws of constitutive parameters were verified by comparing the simulated and experimental results of the lead rubber bearing's stiffness. Research results are of great significance to the seismic performance research and life-cycle performance analysis of offshore traffic engineering such as cross-sea bridges and bridges in the marine environment.

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Section: Determination Of Neo-hookean Constitutive Parametersmentioning

confidence: 59%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of Alternation of Aging and Seawater Erosion on Properties of Rubber Material Used in Lead Rubber Bearing

Li¹,

Zhao²,

Ma³

et al. 2022

Journal of Renewable Materials

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show abstract

“…For the steel dowels of the elastomeric bridge bearings, corrosion deterioration can lead to a reduction in both the cross-section and the shear strength. Moreover, the elastomeric NR pads suffer an increase in both the shear modulus and shear stiffness due to corrosion and thermal oxidation [ 28 , 29 , 30 ].…”

Section: Degradation Of Elastomeric Bridge Bearings Due To Corrosion ...mentioning

confidence: 99%

“…Meanwhile, the corrosion of critical components, including the corrosion of RC columns and the aging of elastomeric bridge bearings, as well as the combined effects of prestress loss and cracking, also have a negative effect on seismic performance. Therefore, bridge columns are assumed to be subjected to salt mist formed from chloride-laden water [ 27 ], and the elastomeric bridge bearings were considered to be affected by chloride ions and thermal oxidation [ 28 , 29 , 30 ] in this study. For this purpose, the joint effects of multi-deterioration mechanisms on system seismic fragility for RC bridges were researched by considering the degradation correlations between multiple components.…”

Section: Introductionmentioning

confidence: 99%

Time-Dependent Seismic Fragility of Typical Concrete Girder Bridges under Chloride-Induced Corrosion

et al. 2022

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Recent studies highlighted the importance of the combined effects of prestress loss and corrosion deterioration for concrete girder bridge structures when the effect of damage on the performance level is estimated. The multi-deterioration mechanisms connected with chloride erosion include the cross-sectional area loss of longitudinal bars and stirrups, the reduction in the ductility, the decrease in the strength of steels and the strength loss of concrete in RC columns. For the corroded RC columns and corroded elastomeric bridge bearings, analytical models of the material degradation phenomena were employed for performing the probabilistic seismic performance analysis, which could obtain the system seismic fragility of aging bridges by considering the failure functionality of multiple correlated components (e.g., columns, bearings). The combined effects of prestress loss and cracking were also considered when developing time-dependent system seismic fragility functions. Here, a typical multi-span reinforced concrete girder bridge was used as a case study for studying the time-variant seismic performance. The results revealed the importance of the joint effects of the multi-deterioration mechanisms when modeling the time-dependent seismic fragility of aging bridge systems, as well as the significance of considering the combined effects of prestress loss and cracking.

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Deep learning-based condition assessment for bridge elastomeric bearings

Cui¹,

Wu²,

Dang

et al. 2022

J Civil Struct Health Monit

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Experimental Investigation on Ageing Behaviors of Rubbers Used for Bridge Bearings

Cited by 12 publications

References 12 publications

Effect of Alternation of Aging and Seawater Erosion on Properties of Rubber Material Used in Lead Rubber Bearing

Effect of Alternation of Aging and Seawater Erosion on Properties of Rubber Material Used in Lead Rubber Bearing

Time-Dependent Seismic Fragility of Typical Concrete Girder Bridges under Chloride-Induced Corrosion

Deep learning-based condition assessment for bridge elastomeric bearings

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