保护层厚度及钢筋位置对锈蚀钢筋与混凝土粘结性能影响的试验研究结构工程专业论文.docxVIP

保护层厚度及钢筋位置对锈蚀钢筋与混凝土粘结性能的试验研究载后期自由端相对滑移值甚至超过加载端相对滑移值，并且裂缝越密集粘结应力沿锚长 保护层厚度及钢筋位置对锈蚀钢筋与混凝土粘结性能的试验研究 载后期自由端相对滑移值甚至超过加载端相对滑移值，并且裂缝越密集粘结应力沿锚长 的分布波动越多。接下来，对开裂较为不明显试件M1、M2分析得到锚固位置函数，分 析可知该锚固位置函数可做为裂缝间位置函数。结合考虑多因素作用的平均粘结应力滑 移本构关系得到考虑锚固位置影响的粘结滑移本构关系。 关键词：粘结滑移；锈蚀率；梁式试验；粘结应力分布；保护层厚度 万方数据 Experimental Experimental Study on The Influence of Concrete Cover Thickness and Steel Bar Position on Bond Behaviors between Corrosion Steel Bars and Concrete Abstract As the problem caused by durability of reinforced concrete structures revealed，the factors affecting the durability and the degeneration of structures caused by durability has been a popular focus．Among these factors，the corrosion of reinforcement has become the primary reason of concrete durability destruction．In recent years，according to a survey about the earthquake disaster,the destruction of reinforced concrete structure under strong earthquake iS caused by the bond failure．It iS well known that the weak parts of reinforced concrete structure are the connection site of each members，bond failure is the main reason of the decrease of strength and stiffness in ioint zone．Corrosion of reinforcement could result in the deterioration of the section area and perforrnance of the steel bars．moreover it could deduce the deterioration of bond performance．It indicate that the study of the influence of corrosion rate on bond behavior is necessary,it iS practically significant to evaluate the real loading capacity and analyze the durability of the existing structures，it also has guiding significance to the durability design of new buildings． In this Paper,NaCl solution Was used as electrolyte in the electrochemical accelerate corrosion process．24 specimens of different concrete cover thickness and reinforcement position were corroded with 6 corrosion rates．The expansion of the corrosive crack at different corrosion rate Was observed．The smaller the cover thickness iS，the earlier the surface of the specimen crack occurred at same corrosi