Durability design of prestressed concrete structures

Based on the durability characteristics of prestressed concrete structures,the durability limit states of carbonation and chloride ion attack are defined, respectively.Durability predicting models on the basis of reliability mathematics and stochastic processes areconstructed, and the pure theoretical formulae of failure probability of prestressed concretestructures are analyzed. In addition, a simple durability design method for carbonation ofstructures is put forward. According to the analysis, the durability of prestressed concretestructures is superior to that of traditional structures. The research also indicates that theconcrete cover prescribed in the current code (GB 50010-2002) is not adequate. The rational coverthickness should notbe less than 35 or 45 mm according to carbonation or chloride ion attack,respectively.

隧道防水的若干创新技术与值得重新认识的几个问题

介绍了近年在上海地区建设的若干重大隧道工程采用的管片接缝防水新构造、管片混凝土耐久性指标的检测、管片接缝防水材料的耐久性设计等若干创新技术,并对几个值得重新认识的问题阐明了观点,比如地下连续墙的实际抗渗等级与规范规定的矛盾、隧道连络通道复合防水层与冻结法施工的冲突以及管片背面处理与管片单块检漏等。

探析钢筋混凝土结构的耐久性设计

民用与工业建筑、道路和桥梁工程、港口与水利工程等采用钢筋混凝土结构是功能和稳定性的必然需要,为使建筑物或构筑物功能得以更好发挥,并确保其安全和稳定,加强钢筋混凝土结构的耐久性设计十分必要。论文提出了考虑耐久性退化的钢筋混凝土结构可靠度设计、代表性钢筋混凝土构件耐久性设计以及基于抗震承载力和改进能力谱法的耐久性设计方法,并结合算例予以说明。