多腔钢管再生混凝土复合中长柱轴压性能研究

Study on Axial Compression Performance of Recycled Concrete Composite Midium and Long Columns with Multi-cavity Steel Tubes

为研究多腔钢管再生混凝土复合中长柱在受压状态下的力学性能,采用ABAQUS软件对多腔钢管中长柱在轴向压力下的荷载-位移曲线、破坏模态、受力过程进行了模拟,并研究了再生混凝土取代率和复合柱长细比对其轴压性能的影响。结果表明:多腔钢管中长柱破坏模式为弯曲破坏,外部再生混凝土和核心再生混凝土跨中截面破坏明显,核心混凝土受钢管约束承载力提高明显;随着再生混凝土取代率和长细比的增加,多腔钢管中长柱的承载能力、延性和刚度均减小,当长细比过大时,易发生失稳破坏。

In order to study the axial compression performance of recycled concrete composite medium and long columns with multi-cavity steel tube.The load-displacement curve,failure mode and stress process of the recycled concrete composite medium and long columns with multi-cavity steel tube under axial pressure were studied by ABAQUS software.The effects of replacement rate of recycled concrete and slenderness ratio of components on load-displacement curve,ductility and stiffness of the composite medium and long columns under axial pressure were also studied.The results show that the failure mode of recycled concrete medium and long columns with multi-cavity steel tube is bending failure,the failure of external recycled concrete and core recycled concrete in mid-span section is obvious,and the bearing capacity of core concrete is improved obviously.The bearing capacity,ductility and stiffness of recycled concrete composite medium and long columns with multi-cavity steel tube are decreased with the increase of replacement rate of recycled concrete and the slenderness ratio.The instability failure of recycled concrete composite medium and long columns with multi-cavity steel tube will occur when the slenderness ratio is too large.