Statistical Analysis and Evaluation on Cracks of Simply Supported-to-Continuous Split-type Box Girder Bridges

摘要

In this paper, the crack diseases of 106 simply supported-to-continuous split-type box girder bridges from G55 Taichang and G55 Changjin highways were statistically analyzed by the number of bridges, the frequency of each meter cracks appeared and the degree of cracks developed. According to the norm that Standard for Technical Condition Evaluation of Highway Bridges and which was recommended by the department of transportation, the crack diseases were evaluated by the two indexes, which were maximum crack width Φ_(max) mmmmand crack length divided corresponding section size c/λ. The conclusion provides a technical basis for the effective prevention and treatment of cracks in the design, construction, repair and maintenance in the future. The proposed crack disease statistics method and evaluation method are provided with practical application value for management and maintenance departments to effectively evaluate the crack development and make decisions to repair.