钢护筒与钢筋混凝土协同受力机理数值分析与模型验证

以果园二期桩基为原型,对6个钢护筒与钢筋混凝土短柱结构和2个钢管混凝土短柱进行轴压试验。基于ABAQUS有限元软件,以钢护筒厚度、配筋率、配箍率为参数进行分析。结果表明,钢护筒与钢筋混凝土短柱结构中,钢护筒与箍筋对核心混凝土均有约束作用,且双重约束效应明显,有效抑制混凝土裂缝开展,使结构具有更高的承载力、塑性和韧性。箍筋对混凝土的约束作用对钢护筒与钢筋混凝土短柱的承载力、塑性及延性性能影响显著,随着箍筋间距的减小,构件的承载力及延性性能有明显提高。

Numerical analysis and model validation of cooperative stress mechanism of reinforced concrete-filled steel tube structure

Taking the rock foundation of the second stage of Guoyuan Port as the prototype,we carry out axial compression test of six steel casing-reinforced concrete short column structures and two concrete-filled steel tube columns.Based on ABAQUS finite element software,we take the thickness of steel casing,reinforcement ratio and stirrup ratio as parameters to analyze.The results show that the steel casing and the stirrup have restraint effect on the core concrete in the steel casing-reinforced concrete short column structure,and the double restraining effect is obvious.The restraining effect of the steel casing and the stirrup on the core concrete can effectively suppression of cracks in concrete causes the steel casing to have higher bearing capacity,plasticity and toughness than conventional steel tube concrete structures.The restraining effect of stirrups on concrete has significant influence on the bearing capacity,ductility and ductility of steel casing and reinforced concrete short columns.With the decrease of the spacing between stirrups,the bearing capacity and ductility of the components are increasing obviously.