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FRP(Fiber Reinforced Polymer)筋弹性模量较低且没有明显屈服点,导致FRP筋混凝土梁受荷时产生较大的挠度变形和裂缝宽度,造成多数情况下,适用性要求在设计中起控制作用。在国外有关FRP筋混凝土梁挠度计算方法分析基础上,对2组5个混凝土梁式试件进行了弯曲试验研究。根据试验荷载-挠度关系曲线,以截面开裂弯矩和极限状态的截面弯矩确定的双直线弯矩-曲率关系模型为基础,导出了FRP筋混凝土梁挠度计算公式,计算结果与试验结果吻合较好。
The low modulus of elasticity of FRP (Fiber Reinforced Polymer) has no obvious yield point, which leads to large deflection and crack width of FRP reinforced concrete beams. In most cases, the applicability requirements play a controlling role in the design. Based on the analysis of the deflection calculation method of FRP reinforced concrete beams in foreign countries, the bending test of two groups of five concrete beam specimens was carried out. According to the test load-deflection curve, the formula of deflection of concrete beam with FRP bars is deduced based on the model of double-line moment-curvature determined by the moment of rupture at the section and the bending moment of the ultimate section. The calculation results are in good agreement with the experimental results it is good.