钢骨高强混凝土短柱轴压力系数限值

Limited values on axial compression ratio of steel reinforced high-strength concrete short columns

通过 1 9根剪跨比为 1 .5的试件对钢骨高强混凝土短柱的力学性能进行了试验研究 ,分析了短柱的主要破坏形态和轴压力系数、配箍率、含钢率对钢骨高强混凝土短柱延性的影响 ,并得出了相应的影响因素和延性间的关系曲线 .发现钢骨高强混凝土短柱位移延性随轴压力系数的减小和配箍率的增加而增大 ;但配箍率增加到一定值后 ,延性的增速减缓 ;延性也随着含钢率的增加而增加 .鉴于现行国家规范中没有规定钢骨高强混凝土短柱的轴压力系数限值 ,根据试验结果 。

The experimental research on the mechanical performance is carried out through 19 steel reinforced high\|strength concrete short columns. The main factors such as axial compression ratio, stirrup ratio, steel ratio and shear span ratio, which affect the ductility of steel reinforced high\|strength concrete short columns, are analyzed. The failure characteristics of steel reinforced high\|strength concrete short columns are also analyzed . Some results are obtained through the test. It is shown that the ductility of steel reinforced high\|strength concrete short columns increases with the reducing of the axial compression ratio and the increasing of the stirrup ratio. But when the stirrup ratio is raised to a certain value, the ductility increases slowly with the increasing of the stirrup ratio. The ductility also increases with the increasing of the steel ratio. The limit values of the axial compression ratio of steel reinforced high\|strength concrete short columns are reached, which satisfy a certain requirement of ductility. The results are significant to revise Chinese code for design and construction of steel reinforced high\|strength concrete.