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在服役钢筋混凝土桥梁耐久性寿命的终结原因是多方面的。首先是因结构性能退化导致结构达到承载力极限而致使桥梁结构破坏;其次是钢筋锈蚀引起保护层开裂而不能满足有关规范对裂缝宽度要求而引起的终结;再次是不能够满足正常使用极限状态而终结。本文结合近年来在一般大气环境下钢筋混凝土结构有关科研成果,提出大气环境下钢筋混凝土桥梁耐久性寿命评估的方法。该方法考虑了承载力决定的寿命和耐久性决定的寿命2个方面,而对正常使用决定的寿命,由于目前研究成果的匮乏,本文不予考虑。
There are many reasons for the end of service life of reinforced concrete bridges in service. The first is the structural performance degradation led to the structure to achieve the ultimate bearing capacity resulting in the destruction of the bridge structure; followed by steel corrosion caused by cracking of the protective layer can not meet the requirements of the relevant provisions of the crack width of the end; once again not be able to meet the normal use of the limit state End. In this paper, based on the research results of reinforced concrete structures in the general atmosphere in recent years, the method of durability life assessment of reinforced concrete bridges under atmospheric environment is proposed. The method takes into account two aspects of the life span determined by the bearing capacity and the durability determined by the durability. However, the life span determined by normal use is not considered in this paper due to the lack of current research results.