氯盐侵蚀下开裂混凝土耐久性可靠度研究  

Study on Durability of Reinforced Concrete MembersDue to Chloride Ingressionion Erosion

作　　者：兰瑞鑫 李扬 叶梦琦 LAN Ruixin;LI Yang;YE Mengqi(School of Civil Engin.,Architecture and Environment,Hubei Univ.of Tech.,Wuhan 430068,China)

机构地区：[1]湖北工业大学土木建筑与环境学院,湖北武汉430068

出　　处：《湖北工业大学学报》2021年第4期85-90,共6页Journal of Hubei University of Technology

摘　　要：通过对诱导产生开裂的混凝土进行氯离子渗透试验,提出对带裂缝混凝土在饱和及非饱和状态下的氯离子渗透修正模型。在此基础上,基于引入示性函数的蒙特卡洛法,提出针对混凝土耐久性的模糊可靠度计算方法,并对某工程案例中的带裂缝混凝土结构进行了耐久性可靠度计算,对结构服役时间、裂缝宽度等参数对可靠度的敏感性影响进行了分析。研究表明:在氯离子侵蚀环境状态下,裂缝宽度与结构服役时间的增加都会显著降低结构的可靠度指标。同时对于混凝土给出了它的敏感性分析结果以及耐久性的寿命预测结果,可为相应的实际工程应用中给出参考。Based on the chloride ion penetration test of concrete with induced cracking,a modified chloride ion penetration model for concrete with cracks under saturated and unsaturated conditions is proposed.On this basis,and on the ground of the Monte Carlo method of introducing the indicative function,a fuzzy reliability calculation method for concrete durability is proposed,and the durability reliability of a concrete structure with cracks in an engineering case is calculated,and the sensitivity influence of structural service time,crack width and other parameters on the reliability is analyzed.The results show that the increase of crack width and service time will significantly reduce the reliability index of the structure under the chloride ion erosion environment.At the same time,the sensitivity analysis results and durability life prediction results of concrete are given,which can provide reference index for the corresponding practical engineering application.

关 键 词：裂缝 氯离子扩散 模糊可靠度 耐久性 

分 类 号：TU5[建筑科学—建筑技术科学]