【作者】 雷斌； 肖建庄；

【Author】 XIAO Jian-zhuang LEI Bin(Department of Building Engineering,Tongji University,Shanghai 200092,China)

【机构】 同济大学建筑工程系；

【摘要】 本文通过分析现有模型并结合国内外试验成果,建立了再生混凝土碳化深度计算模型,并在此基础上提出了极限状态法和分项系数法两种再生混凝土结构耐久性设计方法,并对再生混凝土梁使用寿命进行了可靠度分析。结果表明,增大再生混凝土强度等级和再生混凝土保护层厚度可以提高再生混凝土构件耐久性;受力状态、钢筋位置对再生混凝土构件耐久性有重要影响。综合考虑再生混凝土中钢筋开始锈蚀对结构使用功能的影响程度和再生混凝土的不同受力状态,提出了上海地区再生混凝土构件中钢筋的再生混凝土最小保护层厚度。更多还原

【Abstract】 Based on the investigation of available achievements on carbonation of recycled concrete and concrete carbonation test data at home and abroad,the model of recycled concrete carbonation depth was established and the limit state method and the lifetime safety factor method for recycled concrete structures were put forward in this paper.The reliability analysis of service life for recycled concrete beams was undertaken.Analysis results show that the increase of compressive strength grades of recycled concrete and thickness of recycled concrete cover can improve the service life remarkably;while stress state of recycled concrete and the placement of reinforcing bars will have insignificant effects on the durability life of recycled concrete structures. Comprehensively considering both to what extent the functionality of recycled concrete structures was deteriorated when carbonation-initiated corrosion of reinforcement in recycled concrete started and the different stress state(tensile or compressive)of recycled concrete elements was endured, the minimal thickness of recycled concrete cover of reinforcement in recycled concrete elements was proposed in Shanghai area.更多还原