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在钢板中部位置设置具有约束钢板外凸变形作用的水平拉杆,是改善异形截面钢管混凝土柱力学性能的有效方法。在已有文献对带约束拉杆方形、矩形、L形、T形、十形截面钢管混凝土短柱轴压试验研究成果的基础上,通过合理假定,将L形、T形和十形钢管混凝土截面分别划分成一个无拉杆的方形和若干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,分别建立力学表达格式统一的带约束拉杆方形和矩形截面、以及带约束拉杆L形、T形、十形截面各区域的钢管内核心混凝土等效单轴本构关系。采用所建立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。
It is an effective way to improve the mechanical properties of concrete-filled CFST columns with a central horizontal tie bar with restrained steel deformation in the middle of the steel plate. Based on the research results of the axial compression tests on square columns, rectangular columns, L-sections, T-sections and ten-section concrete filled steel tubular columns with restrained tie rods, the L-shaped, T- Respectively, into a square and a number of concrete-filled rectangular steel tube concrete with pull rod, draw lessons from constitutive model of confined concrete, establish a square and rectangular cross-section with restrained tie rod with uniform mechanical expression format, , Ten-section cross-section of the core of the steel core concrete equivalent uniaxial constitutive relationship. Through the established constitutive relation, the whole process of load-strain analysis was carried out on the specimens of the related tests. The calculated curves agree well with the experimental curves.