空间钢构架-钢管混凝土组合柱偏心受压性能的有限元分析

Finite Element Analysis of Eccentric Compression Property of Spatial Steel Frame-circular Steel Tube Concrete Composite Column

在空间钢构架混凝土柱中,内埋圆形钢管形成空间钢构架-钢管混凝土组合柱.为了探索该新型组合柱的偏心受压性能,在试验研究基础上,采用ABAQUS有限元分析软件,建立空间钢构架-钢管混凝土组合柱偏心受压性能的非线性有限元模型,在模型验证基础上,考虑钢管混凝土套箍指标、空间钢构架混凝土约束影响系数、偏心距等参数,对组合柱偏心受压性能进行模拟分析.结果表明,随着空间钢构架弦杆配筋率、空间钢构架混凝土约束影响系数、内埋钢管配骨率、内埋钢管混凝土套箍指标等增大,组合柱偏心受压承载力提高,且小偏心受压时其提高幅度要比大偏心受压时显著.

The spatial steel frame-circular steel tube concrete composite column was formed by buried circular steel tube in spatial steel frame concrete column. In order to explore the eccentric compression properties of this new composite column, a nonlinear finite element model of eccentric compression property of the spatial steel frame-circular steel tube concrete composite column was established by using ABAQUS finite element analysis software. On the basis of model verification, the eccentric compression properties of the composite column was simulated and analyzed by considering parameters such as the index of steel tubular concrete hoop, the restraint effect coefficient of spatial steel frame concrete, and eccentricity. The analysis shows that the combined column eccentric compression bearing capacity is improved with the increase of the spatial steel frame chord reinforcement ratio, the spatial steel frame concrete restraint influence coefficient, the embedded steel pipe distribution rate, the embedded steel pipe concrete ferrule index, etc. The increase of small eccentric pressure is more significant than that of large eccentric pressure.