FRP筋混凝土梁正截面极限抗弯承载力的性能研究

利用FRP筋混凝土粱截面的平衡条件和变形协调条件．给出梁的平衡配筋率；分析FRP筋混凝土梁三种破坏模式，即受压破坏、受拉破坏和平衡破坏的特性；研究FRP筋混凝土梁配筋率对其正截面极限抗弯承载力的影响，并给出其影响系数。研究表明：配筋率在一定范围内，抗弯承载力随着配筋率的增大而增大；根据配筋率的不同，探讨FRP筋混凝土梁正截面极限抗弯承栽力的计算方法，建立与之相应的计算公式，并将计算结果与国内外文献中的部分试验结果相比较，且两者吻合较好。

Calculation method and ultimate flexural capacity of concrete beam reinforced with FRP rods

Based on equilibrium and deflection compatibility condition of concrete beam section reinforced with FRP bars, the balanced reinforcement ratio was provided. The properties of three modes of failure which were compression, tension and balanced failure of such beam were analyzed. Reinforcement ratio affecting on ultimate flexural capacity of beams was studied and the effect coefficient was presented. The results showed that the flexural capacity would increase with the reinforcement ratio in the certain scope. According todifferent reinforcement ratio, the calculation method of ultimate flexural capacity was discussed and the formulas were established. A comparison between theoretically and experimentally flexural behaviors of concrete beams reinforced with FRP bars was investigated. The comparison was made better.