GFRP管钢筋混凝土组合构件抗弯性能实验研究

通过抗弯实验,研究了GFRP管(劲性)钢筋混凝土组合构件的抗弯性能.实验结果表明,GFRP管对混凝土的紧箍效应仅存在于受压区,对受拉区混凝土约束作用不明显;组合构件的荷载-变形曲线明显出现弹性直线、弹塑性曲线和上升直线3个阶段;组合构件内部设置型钢能有效提高组合构件的抗弯承载力和刚度;采用纤维模型法编制程序的计算结果与实验结果吻合良好;组合构件的抗弯承载力随着钢面积分数的增加、混凝土强度等级的提高及GFRP管壁厚度增加而提高.

Experimental Research on Anti-bending Performance of Composite RC-Filled GFRP Tube Members

The anti-bending performance of the composite RC-filled GFRP tube member was researched experimentally. The results showed that the hooping effect of GFRP tube on concrete is found obviously only in the compressive zone, but it is unobvious in the tensile zone. There are three stages shown clearly on the load-deformation curves of the composite members, i.e., the linearly elastic, nonlinearly elastic-plastic and linearly ascending sections. The section steel provided within the GFRP tube can improve the rigidity and bearing capacity of the composite member efficiently. The computed results with the program based on fiber model are well in agreement with the experimental ones, and show that the bearing capacity of the composite member increases with area fraction of steel, concrete strength and wall thickness of GFRP tube.