不锈钢钢筋混凝土技术综述与桥梁应用设计指引

Technological Overview of Stainless Steel Reinforced Concrete and Design Guidelines for Application in Bridge

普通钢筋混凝土构件在恶劣环境条件下普遍耐久性不足,采用不锈钢钢筋可从根本上解决锈蚀问题进而提高结构耐久性,保障结构服役安全和设计使用寿命,节约维养费用。相关规范特别是钢筋混凝土用不锈钢钢筋国家标准的颁布,为其在桥梁工程的推行使用创造了条件。鉴于不锈钢钢筋与普通钢筋存在一定差别,不能简单按直接等代置换进行设计。分析建立了桥梁混凝土结构不锈钢钢筋应用的设计内容,基于国内外研究成果,总结提出了桥梁混凝土结构不锈钢钢筋的应用场合、材料选择、保护层厚度、弯曲与连接、与普通钢筋同时使用、承载力、变形及裂缝、温度变形差、抗疲劳及抗震性能的设计指引,并分析探讨了有关问题。

Under the severe environmental conditions,the ordinary reinforced concrete members generally have the problem of insufficient durability.The use of stainless steel reinforcement can fundamentally prevent steel corrosion,significantly improve the durability of the structure,ensure the service safety and design life of the structure,and save the maintenance costs.The promulgation of relevant norms,especially the national standard of stainless steel reinforcement for reinforced concrete,has created conditions for its implementation and use in bridge engineering.In view of the difference between the stainless steel bar and the ordinary steel bar,the design cannot be simply based on direct equal substitution.The design content of application of stainless steel reinforcement in bridge concrete structure is analyzed and established.Based on the research results at home and abroad,the application situation,materials selection,protective layer thickness,bending and connection of the stainless steel reinforcement in bridge concrete structure,and the design guidelines of its use in conjunction with ordinary steel,bearing capacity,deformation and crack,temperature deformation difference,fatigue resistance and seismic performance are summarized and proposed.Some related problems are analyzed and discussed.