角钢套箍高强混凝土轴压短柱承载力分析与设计建议

Bearing capacity analysis and design suggestion on angle-steel confined high-strength concrete short column under axial compression

以套箍系数、混凝土等级和钢材屈服强度为控制参数,设计15根剪跨比为1.5的角钢套箍高强混凝土轴压短柱;基于简化的钢材本构模型和考虑套箍效应的约束高强混凝土本构模型,采用ANSYS有限元软件进行数值仿真分析,通过与实验数据对比验证有限元建模的合理性;考察不同套箍系数、混凝土强度等级和角钢屈服强度等级对角钢套箍高强混凝土轴压短柱力学性能的影响;考虑缀板对混凝土的套箍效应,引入缀板影响因数,利用1stopt软件反演影响因数与套箍系数之间线性关系,建立角钢套箍高强混凝土轴压短柱极限承载力计算表达式,提出轴压短柱的设计方法与施工建议。结果表明,套箍系数比其他参数对轴压短柱的承载力和延性的影响更加显著,为该短柱在新建和改造工程中的应用奠定基础。

This paper took the hoop coefficient,strength grade of concrete and yield strength of steel as parameters,15 angle-steel confined high-strength concrete(ACHC)short columns with a shear span ratio of 1.5 were designed under axial compression.Based on simplified steel constitutive model and confined concrete constitutive model considering hoop effect,the finite element simulation analysis on them was carried out,by comparing with the experimental data the rationality of finite element modeling is verified.The author investigate the influence for different hoop coefficient,different concrete strength grade and different yield strength of steel to mechanic behavior of ACHC short columns.Considering the hoop effect of batten plate to concrete,the influence factor of the slab is introduced,and the linear relationship between the influence factor and the hoop coefficient is inverted by using 1 stopt software.Calculation formula of ultimate bearing capacity of ACHC short columns under axial compression is gotten and design method and design suggestion of this kind of short column is put forward.The results show that hoop coefficient for influence of bearing capacity and ductility of short column is more significantly than other parameters,which can lay a foundation for application of this kind of short columns in new construction and reconstruction projects.