氯離子單向侵蝕下鋼筋銹脹力的分布規(guī)律研究
楊勇良1 王大軍2
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（1 西安金地置業(yè)投資有限公司，西安 710075；2 甘肅省建筑設計研究院，蘭州 730000）[摘要] 氯離子侵蝕作用下的鋼筋銹脹效應是目前的研究熱點。但現(xiàn)有研究大多假設鋼筋發(fā)生的是均勻銹蝕，而在實際中存在很多由于氯離子單向侵蝕而造成的不均勻銹蝕情況。為此，首先研究了氯離子單向侵蝕下，混凝土內鋼筋的銹蝕量及銹脹力分布的不均勻性，提出了銹脹力的不均勻分布模型。然后基于彈性力學提出了確定混凝土保護層開裂時刻鋼筋截面各處銹脹力數(shù)值的計算方法，進而給出了便于實際應用的簡便計算公式。[關鍵詞] 氯離子; 單向侵蝕; 銹脹力; 不均勻中圖分類號：TU528.1 文獻標識碼：A 文章編號：1002-848X(2013)S2-0581-03作者簡介：楊勇良，學士，工程師，Email：yangyongliang413@163.com。Study on the distributing rule of steel bar corrosion expansion force under chloride ion unidirectional corrosionYang Yongliang1, Wang Dajun2（1 Xi,an Gemdale Real Estate Investment Co., Ltd., Xi,an 710075,China; 2 Gansu Architecture Design and Research Institute, Lanzhou 730000, China)Abstract: The corrosion of steel bar induced by chloride ion has been studied as a hotspot at present. Most existing studies were based on the assumption that corrosion form of steel bar is uniform. However, the non-uniform corrosion phenomenon induced by unidirectional chloride ion erosion can be seen widely in situ. Therefore, the non-uniform distributing rule of steel bar’s corrosion quantity and expansion force under chloride ion unidirectional erosion has been studied firstly in this paper. A new non-uniform distributing model of expansion force was put forward. Subsequently, based on elastic mechanics, a new calculation method for the expansion force of steel bar section when the concrete protective layer is cracked was put forward. A simple formula for the actual application was then proposed.Keywords: chloride ion; unidirectional erosion; corrosion expansion force; non-uniform
