Spelling suggestions: "subject:"[een] STEEL BRIDGE"" "subject:"[enn] STEEL BRIDGE""
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鋼橋塗装の部分劣化対策に関するライフサイクルアナリシスSugiura, Yuki, Kaneko, Keisuke, Itoh, Yoshito, Hosoi, Akihiro, 杉浦, 友樹, 金子, 恵介, 伊藤, 義人, 細井, 章浩 01 August 2011 (has links)
No description available.
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加熱・冷却された構造用鋼溶接部の材料特性に関する基礎的研究ITOH, Yoshito, KITANE, Yasuo, HIROHATA, Mikihito, 伊藤, 義人, 北根, 安雄, 廣畑, 幹人 11 1900 (has links)
No description available.
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CORROSION MITIGATION STRATEGIES FOR FLANGE SPLICE CONNECTIONS IN STEEL BRIDGESEdgar Oscary Soriano Somarriba (11178333) 26 July 2021 (has links)
<p>As of 2013, the damage caused by corrosion on highway
bridges has been estimated to cost approximately 14 billion dollars annually,
and this cost has been increasing over the years. Corrosion is one of the
natural phenomena that has been slowly deteriorating infrastructure systems
across the United States. One of the most problematic types of corrosion is
crevice corrosion, which is defined as the formation of rust between
overlapping surfaces such as the case of a splice connection where flanges are
attached by splice plates. A significant number of steel bridges in Indiana
have developed crevice corrosion in splice connections. Therefore, this
research focuses on the crevice corrosion, or “pack rust”, occurring in these
structural elements. The application of coatings alone has not been enough to
stop pack rust at these connections. In an attempt to look for approaches that
can effectively mitigate this problem and maintain the designed service life of
bridges, different strategies have been studied and tested. The first objective
of this study is to determine the strength reduction as a function of the time
of exposure to salt misting. To do this, specimens that simulate the bottom
flange splice connection have been exposed to a corrosive environment for different
periods of time and later tested under tension to assess the reduction in
strength. The second objective is to evaluate the effectiveness of the
mitigation strategies under different conditions. First, the mitigating
products were initially applied before exposure to salt misting. Second, the
mitigating products were applied as a repair, and in this case, the specimens
corroded for a given period of time and were then repaired to evaluate any
further deterioration. The assessment of the strategies’ effectiveness is based
on the strength reduction and visual inspection of the specimens. The ultimate
outcome of this study is a series of general guidelines to slow down crevice
corrosion based on the results of the laboratory testing. </p>
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[pt] AVALIAÇÃO DO CICLO DE VIDA DE PONTES DE AÇO CONSIDERANDO O DANO POR FADIGA E CORROSÃO / [en] LIFE CYCLE ASSESSMENT OF STEEL BRIDGES CONSIDERING FATIGUE AND CORROSION DAMAGEVERISSA PINTO MARQUES QUEIROZ 14 December 2020 (has links)
[pt] Pontes rodoviárias são estruturas sujeitas à ação conjunta de fadiga e corrosão. Nesse sentido, este trabalho propõe um protótipo de sistema para auxiliar na tomada de decisão sobre a manutenção de pontes de viga de aço, no qual apenas pontes simplesmente apoiadas são consideradas. O sistema considera os efeitos da corrosão-fadiga e estima o tempo de vida útil dessas estruturas a partir de uma análise de confiabilidade estrutural. Tal análise é baseada nas curvas S-N para fadiga da norma americana AASHTO e na regra do acúmulo de dano de Miner. Para considerar a perda de material e a perda de resistência causadas pela corrosão, são realizados ajustes nos parâmetros de fadiga do modelo de confiabilidade utilizado. Além disso, algumas alternativas de manutenção que reduzem a taxa de degradação são consideradas no sistema com a correção dos parâmetros de corrosão do material. O sistema utiliza uma rede neural artificial para estimar as tensões nas vigas de aço com a passagem de um veículo de fadiga da AASHTO a partir de dados geométricos e de material da ponte. A base de dados utilizada para o desenvolvimento da rede neural foi criada a partir de resultados de simulações por elementos finitos. O ciclo de vida de uma ponte de aço projetada conforme a norma americana é simulado usando o sistema proposto. Através dessa simulação, conclui-se que o tempo de vida útil da mesma está relacionado com a combinação dos parâmetros de tráfego e da agressividade do ambiente. Conclui-se também que o aumento no volume de tráfego médio diário de caminhões (ADTT) pode causar uma redução de 48 por cento a 76 por cento na vida útil e dependendo do aumento na sua taxa de crescimento anual a redução pode ser de até 80 por cento. As alternativas de lavagem da superestrutura proporcionam ganho de vida útil para todos os ambientes, sobretudo no ambiente marinho (podendo chegar até 30 por cento). No entanto, em alguns dos cenários de tráfego testados nas simulações esse ganho não é suficiente para garantir o tempo de vida útil mínimo recomendado pela AASHTO. / [en] Highway bridges are structures subjected to the both action of fatigue and corrosion. In this sense, this research proposes the prototype of a system to assist in the maintenance decision making process of steel beam bridges, in which only simply supported steel girder bridges are considered. The system contemplates the effects of corrosion-fatigue and estimates the lifetime of these structures based on a structural reliability analysis. Such analysis is based on AASHTO S-N fatigue curves and Miner s damage accumulation rule. In order to account for material and resistance loss caused by corrosion, adjustments are made to the fatigue parameters of the reliability model used. In addition, some maintenance strategies that reduce the rate of corrosion are considered in the system by correcting the corrosion parameters of the material. The system uses an artificial neural network model to estimate the stresses in steel beams under the passage of an AASHTO fatigue vehicle using geometric and material data from the bridge. The database used for the development of the neural network was created from finite element simulations results. The life cycle of a steel bridge, designed according to the AASHTO American standard, is simulated using the proposed system. Through this simulation, it is concluded that the structure s lifetime is related to the combination of traffic parameters and the environment corrosivity. It is also observed that the increase in the average daily truck traffic (ADTT) can cause a reduction from 48 percent to 76 percent in the bridge s lifetime and depending on its annual growth increase rate the reduction can go up to 80 percent. Maintenance alternatives for the superstructure such as washing provide a lifetime gain for all environments, especially in the marine environment (up to 30 percent). However, in some of the tested traffic scenarios this gain is not sufficient to guarantee the minimum service life recommended by AASHTO.
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HIGH PERFORMANCE STEEL BRIDGE GIRDERS: PERFORMANCE & DESIGNKAYSER, CAROLINE ROSE 20 July 2006 (has links)
No description available.
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鋼橋防食に用いられる金属皮膜の腐食劣化評価に関する実験的研究伊藤, 義人, ITOH, Yoshito, 金, 仁泰, KIM, In-Tae, 肥田, 達久, HIDA, Tatsuhisa, 坪内, 佐織, TSUBOUCHI, Saori, 忽那, 幸浩, KUTSUNA, Yukihiro 03 1900 (has links)
No description available.
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コンクリートを柱基部に部分充填した長方形断面鋼製橋脚の耐震照査法前野, 裕文, Maeno, Hirofumi, 森下, 宣明, Morishita, Nobuaki, 葛, 漢彬, Ge, Hanbin, 青木, 徹彦, Aoki, Tetsuhiko, 高野, 光史, Takano, Koji, 吉光, 友雄, Yoshimitsu, Tomoo 03 1900 (has links)
No description available.
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円形素地露出部を持つ防食鋼板の腐食劣化評価に関する実験的研究金, 仁泰, KIM, In-Tae, 伊藤, 義人, ITOH, Yoshito 03 1900 (has links)
No description available.
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鋼製補剛箱形断面橋脚の繰り返し弾塑性挙動に関する解析的研究葛, 漢彬, Ge, Hanbin, 宇佐美, 勉, Usami, Tsutomu, 高, 聖彬, Gao, Shengbin 03 1900 (has links)
No description available.
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免震鋼製橋脚のハイブリッド地震応答実験手法の妥当性に関する検討中島, 大輔, Nakajima, Daisuke, 宇佐美, 勉, Usami, Tsutomu, 葛西, 昭, Kasai, Akira, 金田一, 智章, Kindaichi, Tomoaki 03 1900 (has links)
No description available.
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