受硫酸盐腐蚀钢筋混凝土梁延性分析  

Ductility analysis of reinforced concrete beams corroded by sulfate

作　　者：范颖芳[1] 胡志强[2] 赵颖华[1] 

机构地区：[1]大连海事大学道路与桥梁工程研究所,大连116026 [2]大连理工大学土木水利学院,大连116024

出　　处：《哈尔滨工业大学学报》2009年第4期239-242,共4页Journal of Harbin Institute of Technology

基　　金：国家自然科学基金资助项目(50708010);辽宁省博士启动基金资助项目(1050259);海岸与近海工程国家重点实验室资助项目(LP0605)

摘　　要：为了研究受硫酸盐腐蚀钢筋混凝土梁的延性退化规律,分别利用截面分析法和分形理论对受硫酸盐腐蚀钢筋混凝土梁的延性特性进行了分析计算.在平截面假定的基础上,考虑钢筋和混凝土的腐蚀特点,讨论了钢筋锈蚀与混凝土腐蚀对钢筋混凝土梁延性的影响,分析了受腐蚀梁截面曲率延性系数随钢筋锈蚀率及混凝土劣化系数的演变规律;根据受硫酸盐腐蚀钢筋混凝土梁力学性能的实验研究结果,建立了受硫酸盐腐蚀钢筋混凝土梁截面延性系数的简化计算公式,得到了构件表面裂缝分形维数与构件延性之间的关系.To investigate the deteriorating process of reinforced concrete beams corroded by sulfate, the section analysis method and fractal theory were employed to analyze and calculate the ductility of the corroded beams respectively. According to the corrosion mechanism of the concrete and reinforcing steel in sulfate environment, the normal assumption of plane section behavior was proved to hold true. The available ductility of corroded doubly reinforced concrete beam sections with a range of reinforcement corrosion and concrete degradation was discussed. Based on the mechanical test of corroded beams, a simplified expression is put forward to predict the ductility factor for the beams corroded by sulfate. Relationship between the fractal dimension and the ductility factor of the corroded beams is achieved.

关 键 词：腐蚀 硫酸盐 延性 屈服曲率 极限曲率 分形维数 

分 类 号：TU375[建筑科学—结构工程]