An experimental study on the steel tube confined reinforced concrete (STCRC) column with binding bars under axial compression is conducted. The bearing capacity and failure modes are obtained. It can be known that the axial deformation of concrete occurred under compression. The core concrete is wrapped and constrained by the steel tube wall, and the steel tube wall is constrained by binding bars locally, so the local buckling shape of the wall between the binding bars is like wave shape. The 3D finite element model is also developed to analyze the behavior of this type of column under axial compression. Good agreement is shown between the test and predicted results in terms of the load-deformation curves and ultimate strength. The parametric studies indicate that the spacing of binding bars, diameter of longitudinal bars, concrete strength, thickness of the steel tube wall, and section dimension of the column generate different influence on the mechanical properties and bearing capacity. The diameter of longitudinal bars, concrete strength, and section dimension of the column have a great effect on the ultimate bearing capacity. The numerical results also show that the spacing of binding bars has little effect on the ultimate bearing capacity. The larger thickness of the steel tube wall leads to adverse effect on the specimen performance. Finally, the theoretical calculation is carried out, and the result is good.

中文翻译：

---

带约束杆的钢管约束钢筋混凝土柱的轴压特性

对带有约束杆的钢管承压钢筋混凝土柱进行了轴向压缩试验。获得了承载能力和破坏模式。可以知道，混凝土的轴向变形是在压缩下发生的。核心混凝土被钢管壁包裹和约束，钢管壁被约束杆局部约束，因此约束杆之间壁的局部屈曲形状呈波浪形。还开发了3D有限元模型来分析这种类型的圆柱在轴向压缩下的行为。在载荷变形曲线和极限强度方面，试验结果和预测结果之间显示出良好的一致性。参数研究表明，约束杆的间距，纵向杆的直径，混凝土强度，钢管壁厚，柱截面尺寸对机械性能和承载力产生不同的影响。纵向钢筋的直径，混凝土强度和柱的截面尺寸对极限承载力有很大影响。数值结果还表明，约束杆的间距对极限承载力影响很小。钢管壁的较大厚度会对样品性能产生不利影响。最后进行了理论计算，结果良好。柱的截面尺寸对极限承载力有很大影响。数值结果还表明，约束杆的间距对极限承载力影响很小。钢管壁的较大厚度会对样品性能产生不利影响。最后进行了理论计算，结果良好。柱的截面尺寸对极限承载力有很大影响。数值结果还表明，约束杆的间距对极限承载力影响很小。钢管壁的较大厚度会对样品性能产生不利影响。最后进行了理论计算，结果良好。