Prediction of Aging Characteristics in Natural Rubber Bearings Used in Bridges

Itoh, Yoshito; Gu, Haosheng

doi:10.1061/(asce)1084-0702(2009)14:2(122)

Cited by 54 publications

(32 citation statements)

References 5 publications

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“…However, it has also been observed that elastomeric bearing pads undergo oxidation due to prolonged exposure (Itoh et al, 2006). Therefore, stiffness of the bearing pad (K = GA p /t p ; A p : area of pad; t p : thickness of pad) is updated with time in accordance with the results in Itoh & Gu (2009):…”

Section: Deterioration Mechanisms and Their Modelingmentioning

confidence: 85%

Towards Risk-Based, Multi-Hazard-Resistant Design of Bridges

Kameshwar¹,

Padgett²

2014

Structures Congress 2014

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This paper proposes an object oriented consequence based framework for lifecycle risk assessment to aid design of bridges subjected to multiple hazards while considering the effects of structural deterioration. Such a framework constitutes an essential foundation for a transition to multi-hazard risk-based design. In the proposed framework, losses, i.e. consequences of damage such as cost or downtime, are introduced to provide a common performance metric for multiple hazards. Surrogate models are used to condition loss potential upon the intensity measure(s) of the hazards and structural design parameters. The loss estimates are coupled with hazard information to obtain expected annual losses from each hazard. The fragility of the bridge and consequently the expected annual loss change with time due to aging of the bridge; this time dependent feature is also accounted for in the proposed framework. As a case study, the proposed framework is applied for multi-hazard design of multi-span simply supported (MSSS) concrete girder bridges in coastal South Carolina, which is susceptible to earthquakes and hurricanes induced wave and surge loads in addition to corrosion. The framework's applicability in facilitating safe and economical lifecycle based design is shown by investigating the effect of variation in design parameters and structural deterioration on the lifecycle costs (LCC). The effect of deterioration on lifecycle performance of bridges under different hazards is studied along with relative contribution of each of the hazards towards total expected loss and its variation with time.

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Section: Deterioration Mechanisms and Their Modelingmentioning

confidence: 85%

Towards Risk-Based, Multi-Hazard-Resistant Design of Bridges

Kameshwar¹,

Padgett²

2014

Structures Congress 2014

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“…A and D being the cross‐sectional area and the diameter of a circular bearing, respectively, and t r the total thickness of the rubber. The ageing depends on chemical reactions and diffusion rate of oxygen and is characterized by a fast stage during which the mechanical properties change almost uniformly over the whole area and a slow stage governed by oxidation of the external part until a critical depth

d^{*} = α \cdot e^{β / T},

increasing for lower values of air temperature, where coefficients α (=1.2 × 10 −4 mm) and β (=3.82 × 10 3 K −1 ) can be evaluated with thermal oxidation tests .…”

Section: Modelling Of the Isolation Systemmentioning

confidence: 99%

Effects of the long-term behaviour of isolation devices on the seismic response of base-isolated buildings

Mazza

2019

Struct Control Health Monit

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Summary Seismic isolation is widely used around the world for the protection of buildings, but its long‐term behaviour was not considered in detail in past seismic design of isolated structures. Nevertheless, the American seismic code has recently introduced an explicit procedure aimed at evaluating upper‐bound and lower‐bound values of isolation system properties. Yet there are few studies on the evolution and extent of the deterioration of elastomeric (e.g., high‐damping rubber bearings) and sliding (e.g., flat sliding bearings) isolators during their lifetime and on their impact on the seismic behaviour of the superstructure. To investigate this problem, six‐storey–reinforced concrete buildings, base isolated with high‐damping rubber bearings acting alone or in combination with flat sliding bearings, are designed without considering the variability of mechanical properties of the isolation system due to ageing and air temperature. Then, based on experimental results from accelerated ageing tests at high temperature, mathematical models are implemented to account for oxidation of elastomers and friction changes. The variability of mechanical properties at different mean temperatures, due to seasonal thermal variations, is also considered. Finally, fragility curves are developed for the base‐isolation system and superstructure on the basis of nonlinear dynamic analysis of the degraded test structures.

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“…Karet bantalan untuk perletakan jembatan dan jalan layang akan selalu terpapar oleh udara dan sinar matahari sehingga sangat rentan terhadap proses oksidasi termal yang dapat mengubah sifat-sifatnya (Itoh & Gu, 2009;Ohkura et al, 2011). Kerusakan karet karena oksidasi termal menyebabkan karet menjadi keras namun rapuh, sehingga karet bantalan tidak mampu menahan deformasi dan menyerap energi yang pada akhirnya akan merusak sistem keamanan jembatan atau jalan layang tersebut (Ohkura et al, 2011;Gu & Itoh, 2012).…”

Section: Karet Bantalan Untuk Perletakan Jembatan Dan Jalan Layangunclassified

Kajian Tekno Ekonomi Pendirian Industri Karet Bantalan Jembatan Jenis Karet Alam Dan Karet Kloroprena

Puspitasari

Cifriadi

Falaah

2017

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Peningkatan konsumsi domestik karet alam melalui pemanfaatan produk karet untuk mendukung pembangunan infrastruktur menjadi solusi untuk kembali memperkuat harga karet alam yang sejak akhir tahun 2011 terus mengalami pelemahan. Produk karet bantalan jembatan yang berfungsi sebagai isolator pelindung struktur jembatan dari getaran dan beban lalu lintas berpotensi untuk dikembangkan karena permintaan tinggi di pasaran. Dalam artikel ini diulas kajian tekno-ekonomi pendirian industri karet bantalan jembatan karet alam dan kloroprena dari aspek teknik hingga ekonomi. Data primer diperoleh dengan metode survei melalui teknik wawancara kepada responden yang dipilih secara sengaja, data sekunder dilakukan dengan menerapkan teknik multiplikasi dokumen dan pencatatan data dari instansi terkait lainnya. Metode pengolahan data menggunakan analisis deskriptif kualitatif dan kuantitatif. Hasil kajian diketahui potensi pasar produk karet bantalan jembatan masih terbuka sebesar 57.000 di tahun 2016 dan ditetapkan kapasitas produksi sebesar 17.000 per tahun (30%) dengan komposisi 75% karet bantalan dari karet alam dan 25% dari karet kloroprena. Ukuran karet bantalan yang diproduksi mengacu pada ukuran standar yang ditetapkan oleh kementerian PUPR Jenis 1 : 350x300x36 mm (30%), Jenis 2 : 400x350x39 mm (35%), Jenis 3 : 450x400x45 mm (35%). Hasil kelayakan finansial menunjukkan bahwa industri karet bantalan jembatan dan jalan layang layak didirikan karena memberikan nilai NPV sebesar IDR 14,22 Milyar (bernilai positif atau lebih besar dari nol), IRR sebesar 20,10% (lebih besar dari faktor diskonto 14%), B/C rasio sebesar 1,22 (lebih besar dari 1) dan PBP selama 4,78 tahun. Industri ini sangat sensitif terhadap penurunan harga jual produk dan kenaikan nilai tukar USD terhadap IDR.Kata kunci : konsumsi domestik karet alam, industri hilir karet, bantalan jembatan.

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Prediction of Aging Characteristics in Natural Rubber Bearings Used in Bridges

Cited by 54 publications

References 5 publications

Towards Risk-Based, Multi-Hazard-Resistant Design of Bridges

Towards Risk-Based, Multi-Hazard-Resistant Design of Bridges

Effects of the long-term behaviour of isolation devices on the seismic response of base-isolated buildings

Kajian Tekno Ekonomi Pendirian Industri Karet Bantalan Jembatan Jenis Karet Alam Dan Karet Kloroprena

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