圆钢管混凝土长柱轴心受压影响因素分析

Analysis of Factors Affecting the Axial Compression ofConcrete-filled Circular Steel Tube Long Columns

为进一步扩充圆钢管混凝土长柱轴心受压相关理论,建立圆钢管混凝土长柱有限元模型并结合已知试验验证模型的准确性.制作11根圆钢管混凝土长柱,以钢管壁厚、核心混凝土强度和钢管屈服强度为变量探究对其轴压力学性能的影响.模型试验结果表明,钢管壁厚的增大无论是对破坏形式还是对承载力与延性提高较为显著,圆钢管混凝土长柱的稳定性也得到提高.核心混凝土及钢管屈服强度的增大并未改善,试件的破坏模式,提高了试件的承载力,但其塑性变形能力降低.

In order to further expand the related theories of the axial compression of the concrete-filled circular steel tube long column,a finite element model of it was first established and the accuracy of the model was verified by combining known experiments.Eleven long concrete-filled steel tube columns were established,and the influence of the steel tube wall thickness,core concrete strength and steel tube yield strength as variables was explored to investigate the impact on their axial compression performance.The model test results show that the increase in the wall thickness of the steel tube has a significant effect on the failure mode or the bearing capacity and ductility,and the stability of the long concrete-filled steel tube column is also improved.The increase in the yield strength of the core concrete and steel tube is not improved.The failure mode of the specimen increases the bearing capacity of the specimen,but its plastic deformation ability is reduced.