预应力CFRP筋高性能混凝土T型梁试验研究与非线性分析

Experimental Studies and FEM Analysis of T-shape HPC Beams Prestressed with CFRP Tendons

通过4根梁试件的单调加载静力试验,对体外预应力CFRP筋高性能混凝土T型梁和有粘结预应力CFRP筋高性能混凝土T型梁的受力过程、破坏形态、抗弯承载力、延性和变形等进行较为系统的研究。研究表明:体外预应力与有粘结预应力梁试件均具有较高的抗弯承载力、较大的位移延性和变形能力;体外预应力梁中体内预应力筋的应变增量比相应的体外预应力筋大得多;随着配筋率的增加,有粘结预应力梁试件的抗弯承载力有明显的提高,但其位移延性和变形能力有所降低。此外,应用商用软件ANSYS对4根梁试件进行非线性有限元分析,程序计算值与试验结果吻合良好。

This paper presents experimental studies on four high performance concrete （HPC） T-shape beams prestressed respectively with external and bonded tendons under monotonous loads. The stressing process, failure patterns, flexural capacity, displacement ductility and deformation are systematically studied. Studies show that the T-shape HPC beams prestressed with external and bonded CFRP tendons both have large flexural capacity, high displacement ductility and large deformation capacity. In the externally prestressed beam specimens, the prestressing increments of bonded CFRP tendons are much larger than those of external ones. With the increase of the reinforcement ratio, the flexural capacity of HPC beams prestressed with bonded CFRP tendons increases obviously, but the displacement ductility and deformation capacity of the beams decrease to some extent. Nonlinear FEM analysis of four beam specimens by using commercial software ANSYS is carried out, the calculations are in good agreement with the test results.