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为了解GFRP筋地下连续墙的受弯性能,通过GFRP筋混凝土板和钢筋混凝土板的对比受弯试验,分析了两者的受力-变形过程和破坏形态,对比了两者的挠度、开裂荷载、极限荷载以及混凝土应变。结果表明:GFRP筋混凝土板的受力-变形曲线大致可划分为开裂前和开裂后两个阶段,其破坏表现为脆性;混凝土开裂前两种板的截面应变变化规律均基本符合平截面假定,但开裂后GFRP筋混凝土板的挠度增长速率远大于钢筋混凝土板,且该速率基本不变;两种板的开裂荷载较为接近,而GFRP筋混凝土板的极限荷载为钢筋混凝土板的1.2倍。在试验基础上,建立了GFRP筋混凝土板的有限元模型,通过参数分析表明,GFRP筋混凝土板的抗弯刚度在开裂后随配筋率的增大而增大。
In order to understand the flexural behavior of continuous diaphragm walls with GFRP tendons, the force-deformation process and failure mode of both GFRP tendons and reinforced concrete slabs were analyzed. The deflection, cracking load , Ultimate load and concrete strain. The results show that the stress-deformation curve of GFRP tendons can be roughly divided into two stages before cracking and after cracking, and the failure manifests as brittleness. The cross-sectional strain changes of the two kinds of slabs before cracking are basically consistent with the assumption of flat section, However, the flexural growth rate of GFRP tendons after cracking is far greater than that of reinforced concrete slab, and the rate is almost unchanged. The cracking load of the two slabs is close, while the ultimate load of GFRP slab is 1.2 times that of reinforced concrete slab. Based on the experiment, the finite element model of GFRP reinforced concrete slab is established. The parameter analysis shows that the flexural rigidity of GFRP slab increases with the increase of reinforcement ratio after cracking.