外包纤维加固混凝土短柱轴压力学性能

MECHANICAL BEHAVIOR OF SHORT REINFORCED CONCRETE COLUMNS WRAPPED WITH FRP UNDER AXIAL COMPRESSION

通过对不同约束比情况下的 2 7个圆形、正方形倒圆角及正方形改椭圆形截面的混凝土柱经纤维材料包裹后的轴压短柱试验 ,证实了圆形与椭圆形截面柱能较好地利用纤维材料的抗拉能力 ,可获得良好的加固效果、证实了纤维包裹混凝土轴压全过程曲线也分为三个阶段 ,这是约束混凝土的特点。最后文章还讨论了纤维包裹加固柱的破坏性质和抗力设计指标等取值问题。

Experiments were done on the 27 concrete short columns wrapped with fiber reinforced plastic(FRP) with different confinement ratios and different cross sections (square,circle,fillet radium of square and ellipse modified from square)under axial compression.The result indicates that columns with circle and ellipse sections can make better use of the tensile capacity of FRP materials and improve the strengthening effect strikingly.We also learned that the curve of failure process can be divided into three working stages,which is the inherent property of confined concrete.In the end ,the failure property of short axial compression columns strengthened by FRP was discussed,and so was the choosing method of index values for strengthening design.