- 摘 要
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(1 中船第九設(shè)計研究院工程有限公司，上海 200063； 2 浙江大學(xué)結(jié)構(gòu)工程研究所，杭州 310027)
［摘要］與鋼筋均勻銹蝕相比，鋼筋坑蝕具有顯著的不確定性和截面損失等特點，對混凝土構(gòu)件的抗彎性能具有一定的影響。結(jié)合國內(nèi)外相關(guān)資料，通過實際工程中鋼筋坑蝕的試驗統(tǒng)計，驗證了坑蝕系數(shù)服從極值I型的分布?；阡摻畹目游g概率模型，借助Monte Carlo模擬，分析了銹蝕鋼筋混凝土梁的抗彎承載力，研究了鋼筋坑蝕對混凝土受彎構(gòu)件承載能力的影響。結(jié)果表明，鋼筋坑蝕的隨機性對梁的可靠性有很大影響，鋼筋坑蝕構(gòu)件抗彎承載力的下降速度比均勻銹蝕更快，對梁的耐久性具有潛在危害。
［關(guān)鍵詞］坑蝕；不確定性；抗彎承載力；耐久性
Effect of pitting corrosion on flexural performance of RC beamsNi Guorong1, Jin Weiliang2, Zhu Weihua1, Song Zhigang2(1 China Shipbuilding NDRI Eng. Co.,Ltd.,Shanghai 200063,China;
2 Ins. of Stru. Eng.,Zhejiang Uni.,Hangzhou 310027,China)
Abstract:Pitting corrosion is one of the main manners of corrosion in reinforcement concrete (RC). Compared with general corrosion, the process of pitting corrosion shows more uncertainty and the reinforcement has greater section loss, which as a significant effect on flexural performance of component. It was proved thatthe Gumbel distribution is appropriate for modelling the pitting factor, by reference of correlative data and experimentation of practical reinforced bars. Based on probability model of pitting corrosion, Monte Carlo simulation method was introduced to analyze the effect of pitting corrosion on the flexural performance of RC beams. The results indicate that the randomicity of pitting corrosion has a great influence on the reliability of RC beams and the speed of induction of bending capacity of pitting corroded component is much higher than general corrosion, which has a potential hazard on the durability of RC beams.
Keywords:pitting corrosion; uncertainty; flexural capacity; durability
作者簡介：倪國榮，碩士，工程師，Email:niguorong@126.com。
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