- 摘 要
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孫 彬1，牛荻濤2
（1 中國建筑科學研究院，北京100013； 2 西安建筑科技大學，西安710055）[摘要] 為了建立較為完善的銹蝕鋼筋與混凝土的粘結(jié)強度模型，改變以往僅考慮鋼筋銹蝕程度的單因素回歸分析方法對粘結(jié)強度模型進行理論分析。對鋼筋與混凝土在接觸面上的粘結(jié)作用機理及粘結(jié)力組成進行分析，借助彈性力學方法，建立了銹蝕前鋼筋與混凝土的粘結(jié)強度理論模型。從銹蝕改變鋼筋表面特征參數(shù)和混凝土保護層約束力入手，采用鋼筋均勻銹蝕假定，并基于未銹鋼筋與混凝土的粘結(jié)強度模型，建立了鋼筋銹蝕后的粘結(jié)強度計算模型，該模型能夠考慮各種因素對粘結(jié)強度的影響。通過試驗數(shù)據(jù)對模型進行了驗證，結(jié)果吻合較好。
[關(guān)鍵詞] 銹蝕；鋼筋；混凝土；粘結(jié)強度；模型Model of bond strength between corroded reinforcement and concrete
Sun Bin1, Niu Ditao2
(l China Academy of Building Research, Beijing 100013, China; 2 Xi'an University of Architecture and Technology, Xi'an 710055, China)
Abstract: In order to perfect model bond strength between corroded reinforcement and concrete, the regessive method which only considers cormsion degree of steel bars is abandoned, and theoretical analysis method is used to build model of bond strength. Bond mechanism and constitution of bond stress on the interface between reirforcement and concrete are investigated, and by means of elastics method,theoretical model of bond strength between reid'orcement and concrete without cormsion is built. Parameters of corroded reinforcement and confinement pmvided by concrete cover after cormsion are explored, and adopting hypothesis of even corrosion,bond strength model of cormded reinforcement with concrete is built based on the model without conosion, which can take all factors into account. The model is used to analyze bond strength of some pullout members, and calculated results agree with test results well.
Keywords: corrosion; reinforcement; concrete; bond strength; model
