FRP约束素混凝土短柱轴压性能的试验研究

The experimental studies on behavior of concrete short columns wrapped with FRP under axial compression

通过对不同约束比λ′下的19个纤维环向约束加固的方形倒角的素混凝土轴心受压短柱的试验研究,表明纤维环向约束是提高柱轴向承载力、改善延性的有效的方法,同时验证了纤维的不同类型、包裹方式、混杂纤维的不同混杂匹配对加固效果有较大的影响。本文还提出FRP约束混凝土短柱的应力—应变全曲线呈“π”状,将其破坏过程分为弹性上升、弹塑性上升、持荷(强化或软化段)、下降四个阶段,曲线的形状及曲线下面积的饱满程度反映了其变形能力的提高。

By the experimental studies on 19 short concrete columns wrapped with different types of fibers in filleted square eross-seedons with different circumferential confining ratios under axial compression, they indicate that the strength and ductility can be efficiently improved. It is found that different wrapped fibers and different hybrid shape and matehing of HFRP of strengthened columns have greatly reinforced load-carrying eapacity. It is also testified that the shapes of stress-strain curves of FRP wrapped columns are ＂π＂ shape, and the failure process can be divided into four branch, namely, the elastic ascending branch, the elastoplastic ascending branch, the strength plateau and the descending branch. The strength and ductility are better from the shape of curve and the degree of satiation below the curve＇s area.