GFRP筋混凝土T型梁正截面抗弯承载力研究

Research on flexural capacity of GFRP-reinforced concrete T beams

为研究GFRP筋T型截面梁的承载力和设计方法,以现有GFRP筋矩形截面梁、钢筋混凝土T型截面梁的理论为参照,推导GFRP筋混凝土T型截面梁承载力的计算公式。与钢筋混凝土梁的计算方法不同,GFRP筋混凝土梁是以平衡配筋率作为判断破坏模式及进行后续计算的关键。应用该公式,通过若干组计算,对3种不同截面情况下,GFRP筋混凝土T型梁与钢筋混凝土T型梁的承载力,进行交叉对比。上述计算公式表明,由于GFRP筋弹性模量较低,因此平衡配筋率较小,用于钢筋混凝土梁的截面,通常并不符合GFRP筋处于平衡破坏配筋范围的要求,以致无法满足承载力。这一点与计算结果是一致的,从侧面验证了该公式的正确性。

To study the bearing capacity and design methods for GFRP-reinforced concrete T beams, formulas of bearing capacity were derived by referring to existing theories of GFRP-reinforced concrete rectangular beams and reinforced concrete T beams. It is different from the methods of reinforced concrete beams, the balanced reinforcement ratio is the key to judge the failure mode and carry out the subsequent calculations for GFRPreinforced concrete beams. Using these formulas with several groups of calculations, the bearing capacity of GFRP-reinforced concrete T beams was taken cross-comparison by considering three different section situations.The above calculation formulas also reflect that because the modulus of elasticity of GFRP bars is relatively low and thus the balanced reinforcement ratio is the same way. Besides, the cross-section for reinforced concrete beams always does not meet the range of balanced damage of GFRP-reinforced concrete beams, which also cannot meet the bearing capacity. The results is consistent with the calculated results also verified the correctness of these formulas on the other hand.