内衬钢管方中空钢筋混凝土短柱轴压性能分析

PERFORMANCE OF SQUARE HOLLOW REINFORCED CONCRETE STUB COLUMNS WITH INNER STEEL TUBE UNDER AXIAL COMPRESSION

为提高空心钢筋混凝土柱的承载能力和延性,文中提出一种内衬钢管的方中空钢筋混凝土短柱。采用有限元软件建立该类柱的非线性有限元模型,模拟结果与试验吻合良好,验证了有限元建模方法的合理准确性,基于此进一步考察钢管壁厚和直径、截面边长、钢管屈服强度和混凝土抗压强度对组合柱轴压刚度、承载力以及延性的影响,并对典型试件进行受力全过程分析。结果表明内衬钢管方中空钢筋混凝土短柱轴压承载力及刚度随混凝土抗压强度的提高而增大,延性随钢管壁厚及直径的增加而增大。

The square hollow reinforced concrete stub columns with inner steel tube are proposed to improve the bearing capacity and the ductility of hollow reinforced concrete column.Finite element models are established using FEM and benchmarked against available test results.The influence of steel tube thickness and diameter,sectional length,steel strength,and concrete strength on initial stiffness,axial compressive capacity,and ductility index are studied.The results show that axial compressive capacity and stiffness increase by increasing concrete strength,and the ductility increases by increasing stel tube thickness and diameter.