- 摘 要
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(浙江大學，杭州 310027)
［摘要］比較了均勻銹蝕和坑蝕對銹蝕鋼筋混凝土梁抗彎承載力的影響，定義了描述鋼筋均勻銹蝕和坑蝕的兩種參數(shù)。用試驗數(shù)據(jù)比較了兩種參數(shù)和銹蝕鋼筋混凝土梁剩余抗彎承載力的關系，指出僅僅用均勻銹蝕描述銹蝕鋼筋混凝土梁的抗彎承載力是不夠的，還應考慮坑蝕的影響。研究了不同坑蝕系數(shù)下均勻銹蝕率和坑蝕銹蝕率的關系，指出確定鋼筋坑蝕量的關鍵在于確定坑蝕系數(shù)的值，對坑蝕系數(shù)的選取應當慎重。給出了同時考慮協(xié)同工作系數(shù)和坑蝕系數(shù)的銹蝕鋼筋混凝土梁抗彎承載力的計算公式，公式的計算結果與14根梁的試驗果可以很好吻合，表明所提出的公式可用于既有混凝土梁剩余抗彎承載力的評估。
［關鍵詞］坑蝕;均勻銹蝕;抗彎承載力;耐久性
Influence of pitting corrosion on the bending capacity of reinforced concrete beams
Jin Weiliang，Xia Jin(Zhejiang University,Hangzhou 310027,China)
Abstract:Influences of both uniform corrosion and pitting corrosion on the bending capacity of the RC beams are compared. Parameters which describe both uniform corrosion and pitting corrosion are defined. Relationships between the two kinds of corrosion parameters and residual capacity of the corroded RC beams are compared by experimental data. It has been pointed out that only using uniform corrosion to describe the flexural strength of the corrosion reinforced concrete beams is not enough, pitting corrosion should also be considered. For different pitting factors, relationships between the uniform corrosion rate and pitting corrosion rate are researched. It has been found out that the key factor for determining the corrosion rate is the value of the pitting factor, which should be used carefully. Formula for the calculation of the bending capacity of the RC beams is given, and both coefficient of concordance and pitting factor are considered. For the good accordant between the calculation results and 14 beams′ experimental results, the proposed formula can be used for evaluating the bending capacity of the existing RC beams.
Keywords:pitting corrosion；uniform corrosion；bending capacity；durability
國家自然科學基金資助項目(50538070)，國家863計劃項目(2006AA04Z422)，國家西部交通建設科技項目(200631800019)，浙江省科技重點計劃項目(2006C13090)。
作者簡介：金偉良，教授，博士生導師，Email：Jinwl@zju.edu.cn。
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