论文部分内容阅读
该文介绍了11个带约束拉杆和5个不带约束拉杆的T形钢管混凝土轴压短柱试件的试验研究,讨论在不同约束拉杆间距与直径、钢板厚度与屈服强度、截面尺寸下试件的破坏与承载力特点。结果表明,约束拉杆的设置改变了钢管的屈曲模态,延迟钢管局部屈曲的发生,有助于T形钢管混凝土轴压短柱的承载力和延性的提高。在合理假定的基础上,将T形钢管混凝土截面划分成1个无拉杆的方形和3个有拉杆的矩形钢管混凝土区域,借鉴约束混凝土本构模型,建立了力学概念清晰的各区域核心混凝土等效单轴本构关系。采用建议的本构关系对相关试验的试件进行了荷载-应变全过程分析,计算曲线和试验曲线吻合良好。
This paper introduces the experimental study of 11 T-shaped concrete-filled steel tubular short columns with restrained tie rods and five tie rods without restraint, and discusses the relationship between different tie rod spacing and diameter, plate thickness and yield strength, cross-sectional dimensions Part damage and bearing capacity characteristics. The results show that the restraining rod changes the buckling mode of steel pipe and delays the local buckling of the steel pipe, which is helpful to improve the bearing capacity and ductility of T-shaped concrete-filled steel tubular short columns. On the basis of reasonable assumption, the section of T-shaped concrete-filled steel tubular is divided into one square with no tie bar and three rectangular concrete filled rectangular steel tubes with tie rods. Using the confined concrete constitutive model, the core concrete Effect of single-axis constitutive relationship. Based on the proposed constitutive relationship, the whole process of load-strain analysis was carried out on the specimens of the relevant tests. The calculated curves agree well with the experimental curves.