CFRP配筋活性粉末混凝土梁延性和变形性能

在对不同参数CFRP配筋活性粉末混凝土梁受弯性能试验研究的基础上,对CFRP配筋活性粉末混凝土梁的延性和变形性能进行了研究,并采用数值分析对CFRP配筋活性粉末混凝土梁的延性性能进行了参数分析.试验和分析结果表明:与CFRP配筋普通混凝土梁相比,CFRP配筋活性粉末混凝土梁具有良好的延性和变形能力;提出的荷载-挠度曲线下降段斜率公式能较好地反映出结构实际受力情形,由此计算的基于能量定义的延性指标与试验值吻合较好;采取增大混凝土极限压应变、增加预应力筋无黏结长度、增大受压钢筋的配筋率或降低有效预应力均能有效增大发生混凝土压碎破坏CFRP配筋RPC梁的延性和变形能力.

Ductility and Deformability of RPC Beams Prestressed with CFRP Tendons

Based on the experimental values of the RPC beams prestressed with CFRP tendons of different parameters, the ductility and deformability of these beams were studied, and a corresponding parametric study of the ductility was conducted on the basis of the numerical analysis program. The research shows that the RPC beams are of better deformation capacity than normal concrete beams, and the proposed unloading rigidity formula can be used to calculate the actual unloading curve. It can be concluded from the parametric study that the deformability and ductility of the RPC beam prestressed with CFRP tendons can be enhanced by increasing the ultimate compressive strain of the concrete, the unbonded length of the tendon, the percentage of the compressive reinforcement and the partial prestress ratio, and by decreasing the effective prestress in tendons.