采用CFRP增强的GFRP管混凝土短柱轴压性能试验研究

通过碳纤维增强复合材料(CFRP)布对玻璃纤维增强复合材料(GFRP)管约束混凝土短柱进行不同方式的加强,制作了12个两两相同的G FRP管约束混凝土短柱试件,研究不同增强模式下GFRP管约束混凝土短柱在单调轴压及重复轴压下的力学性能.分析了试件的破坏模式、承载能力、变形能力、增强效果、应力应变曲线、塑性残余应变与卸载...

Experimental study on axial compression behavior of concrete-filled GFRP tube short columns strengthened with CFRP

In order to study the mechanical properties of concrete-filled glass fiber reinforced polymer (GFRP) tubular short columns under single axial compression and repeated axial compression under different reinforcement modes, twelve two-identical specimens of concrete-filled GFRP tubular short columns were produced. And the concrete-filled GFRP tubular short columns were reinforced by carbon fiber reinforced polymer (CFRP) cloth in different ways. Based on the test results, the failure mode, load carrying capacity of columns, deformation capacity, reinforcement effect, stress-strain curve, relationship between plastic residual strain and unloading strain and limit state of specimens were analyzed. It shows that the ultimate strength of the specimens in three reinforcement modes is improved greatly; there is a linear relationship between the plastic residual strain and the unloading strain of the specimen before and after reinforcement, and the slope of the straight line increases with the strengthening of the restraint. Modifying the FRP-confined concrete loading and unloading model proposed by Lam et al. Predicting the unloading path of CFRP-reinforced GFRP pipe concrete composite short columns by the modified model under repeated axial compression in different reinforcement modes. After comparing, it shows that the test results agree well with the modified model.