A Study of Aging Effect on a Rubber Bearing After About Thirty Years in Use

Kamoshita, Naoto; Hamaguchi, Hiroki; TANI, Yuma; Suzuki, Shigenobu

doi:10.3130/aijt.24.41

Cited by 2 publications

(4 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is also worth noting that aging seems to affect only the outer few centimeters of the rubber part and this has been discussed in some papers in the recent past. [ 29,30 ] Such conclusions were found on NR‐based seismic pads, where the aging was found to only affect the outer few cm of the pad, while the interior bulk was basically unaged. EPDM‐based rubber pads are actually much more aging resistant compared to NR‐based pads, which is an advantage of the present approach.…”

Section: Hyperelastic Modeling Of Rubber Padsmentioning

confidence: 70%

Numerical study on rubber compounds made of reactivated ethylene propylene diene monomer for fiber reinforced elastomeric isolators

Habieb

Cerchiaro²,

Quaglini

et al. 2020

Polymer Engineering & Sci

View full text Add to dashboard Cite

A huge amount of rubber waste coming from tire industry or other sources (eg, weather strips producers) has attracted interest from researchers to investigate the possibility of recycling used rubber for various products, particularly in construction sector. This article presents a series of experimental and numerical investigations to evaluate the feasibility of regenerated synthetic rubber ethylene propylene diene monomer (EPDM) for production of a building seismic isolation system. Four rubber blends using two different sources of regenerated EPDM are considered in this study. The mechanical properties of the recycled rubber under study are evaluated through uniaxial tensile and relaxation tests, considering the accelerated aging effect. Based on several hyperelasticity and viscosity models of rubber available in the literature, several numerical test simulations on rubber compounds and on a prototype of fiber reinforced elastomeric isolators (FREIs) are performed. The test results reveal that the proposed regenerated EPDM compounds can be particularly suitable for the production of unbonded FREIs, especially because they are able to exhibit low/moderate tensile stresses at high‐shear strain. The results also show that not all regenerated rubber blends fulfill the durability requirements of rubber for seismic isolation after accelerated aging tests. The durability of the specimens seems to be mainly affected by the choice of the regenerated rubber source.

show abstract

Section: Hyperelastic Modeling Of Rubber Padsmentioning

confidence: 70%

Numerical study on rubber compounds made of reactivated ethylene propylene diene monomer for fiber reinforced elastomeric isolators

Habieb

Cerchiaro²,

Quaglini

et al. 2020

Polymer Engineering & Sci

View full text Add to dashboard Cite

show abstract

“…Long-term seismic observations, including the 2011 Tohoku Earthquake, have been conducted in this building. Additionally, the aging of seismic isolators was investigated previously (Higashino et al, 1997;Hamaguchi and Yamamoto, 2005;Kyuuke et al, 2005;Hamaguchi et al, 2009;Hamaguchi and Sasaki, 2009;Yamamoto, 2011;Kamoshita et al, 2018;Tanaka et al, 2018). For details on this building or seismic Frontiers in Built Environment frontiersin.org isolators, please refer to the aforementioned literature.…”

Section: Application To An Actual Bi Buildingmentioning

confidence: 99%

“…The arrangement of the piles is the same position as the laminated rubbers. Approximately 10, 22, and 30 years after the completion of construction, one laminated rubber piece was removed, and an aging investigation was conducted (Higashino et al, 1997;Hamaguchi et al, 2009;Kamoshita et al, 2018). According to Kamoshita et al (2018), the vertical stiffness of laminated rubber increased with aging, with a fluctuation range of approximately 19%-2%.…”

Section: Overview Of the Building And Seismic Observation Recordsmentioning

confidence: 99%

“…Approximately 10, 22, and 30 years after the completion of construction, one laminated rubber piece was removed, and an aging investigation was conducted (Higashino et al, 1997;Hamaguchi et al, 2009;Kamoshita et al, 2018). According to Kamoshita et al (2018), the vertical stiffness of laminated rubber increased with aging, with a fluctuation range of approximately 19%-2%. Regarding the horizontal stiffness of the same member, the effect depended on the evaluation section of shear strain γ.…”

Section: Overview Of the Building And Seismic Observation Recordsmentioning

confidence: 99%

See 1 more Smart Citation

Evaluation of stiffness and damping of a base-isolated building considering higher-order modes

Tojo,

Suzuki,

Nakai

2024

Front. Built Environ.

View full text Add to dashboard Cite

Introduction: Structural health monitoring (SHM) is an effective method of understanding the seismic safety of seismic design models and the continued use of buildings after earthquakes. Various system identification methods applicable to SHM have been proposed; however, most target only superstructures. Their applicability for evaluating the soundness of foundations and soil structures should also be examined. In addition, evaluating high-order modes in addition to low-order modes is necessary to capture changes in the vibration characteristics of superstructures, foundations, and soil structures. However, the impact of considering higher-order modes on the identification results has not been sufficiently evaluated. This study aims to address these issues by clarifying the importance of considering higher-order modes and proposing a method that can contribute to improving the accuracy of future building health evaluation methods.Methods: This study proposes a method of evaluating the stiffness and damping of a superstructure and dynamic soil spring considering low-order to high-order modes using the efficient transfer function fitting system for a base-isolated (BI) building. First, numerical experiments were performed to examine the accuracy of the proposed method in evaluating the stiffness and damping of each part when using acceleration data from limited observation points. Furthermore, this method was applied to an existing BI building subjected to the 2011 off the Pacific Coast of Tohoku Earthquake (2011 Tohoku Earthquake) to identify each parameter while considering higher-order modes. In addition, secular changes and the amplitude dependence of each structure were analyzed.Results: The results showed that the stiffness and damping of the seismic isolation layer, superstructure, and dynamic soil spring were stable with little variation owing to aging; however, the influence of amplitude dependence was relatively large.Conclusion: The significance of considering higher-order modes in evaluations of the soundness of foundations and soil structures was demonstrated. Moreover, the response characteristics of earthquakes recorded from 2007, before the 2011 Tohoku Earthquake, up to 2023 were accurately reproduced through numerical simulation by considering the amplitude dependence of the identified physical parameters based on the proposed identification framework.

show abstract

A Study of Aging Effect on a Rubber Bearing After About Thirty Years in Use

Cited by 2 publications

References 5 publications

Numerical study on rubber compounds made of reactivated ethylene propylene diene monomer for fiber reinforced elastomeric isolators

Numerical study on rubber compounds made of reactivated ethylene propylene diene monomer for fiber reinforced elastomeric isolators

Evaluation of stiffness and damping of a base-isolated building considering higher-order modes

Contact Info

Product

Resources

About