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某桥已运营27年,边跨主梁为钢-混结合梁,中跨主梁为钢筋混凝土梁,严重超载导致钢筋混凝土桥跨出现了弯曲裂缝,采用碳纤维增强聚合物(CFRP)布对桥梁进行了加固。为确定由极限荷载引起的作用力,建立了桥梁上部结构的有限元模型并进行计算,计算结果表明,由超载货车所产生的弯矩比由AASHTO标准货车所产生的弯矩大34%~57%。为研究钢筋混凝土梁在用CFRP布加固前、后的弯曲性能,提出一种方法分析了弯矩与曲率的关系,分析结果表明,梁在加固后的极限承载能力明显增加,承受运营荷载的能力也有所增加。
A bridge has been in operation for 27 years, while the main span of the main span is a steel-concrete composite beam, and the middle span is a reinforced concrete beam. Severe overloading leads to curved cracks in the span of the reinforced concrete bridge. CFRP cloth is used to bridge the bridge Reinforced. In order to determine the force caused by the ultimate load, a finite element model of the bridge superstructure was established and calculated. The calculation results show that the bending moment generated by the overloading truck is 34% ~ 57% larger than the bending moment generated by the AASHTO standard truck %. In order to study the flexural behavior of reinforced concrete beams before and after reinforcement with CFRP sheet, a method is presented to analyze the relationship between bending moment and curvature. The analysis results show that the ultimate bearing capacity of the beam increases obviously and the capacity of handling the load It has also increased.