浅析钢筋混凝土桥梁护栏裂纹成因及对耐久性的影响

该文分析了钢筋混凝土桥梁护栏裂纹成因及对耐久性的影响,为钢筋混凝土桥梁护栏设计提供参考。同时可为相关技术规范的修订提供基础数据。通过对桥梁钢筋混凝土护栏裂纹的现场调研和相关文献资料调研,可知桥梁钢筋混凝土护栏中竖向裂纹出现频率较高,且主要为干缩裂纹和温度裂纹。调研路段中多处护栏裂纹宽度超过《公路工程混凝土结构防腐技术规范》(JTG/T B07-01-2006)的要求,会对护栏耐久性产生影响。桥梁钢筋混凝土护栏设计和施工中应考虑裂纹问题。

Elementary Analysis on Cause of Crack and Its Influence on Durability of Reinforced Concrete Bridge Guardrail

The article analyzes the cause of crack and its influence on durability of reinforced concrete bridge guardrail able to refer for the design of the reinforced concrete bridge guardrail,and also able to provide the basis data for the revision of the relative technical standards.The field investigation and the relative literature study on the cracks of the reinforced concrete guardrail of the bridge show that the vertical cracks appear more frequently in the reinforced concrete guardrail of bridge,and are mainly the shrinkage cracks and temperature cracks.The crack width in many investigated road sections does not meet requirements of the Anticorrosion Technology Specification of Highway Engineering Concrete Structure(JTG/T B07-01-2006),which will cause the influence on the durability of bridge guardrails.Therefore,the crack problem should be considered in the design and construction of reinforced concrete bridge guardrails.