轴压“十”字异形双层钢管空心混凝土柱受力性能

Mechanical Performance of the“+”Shaped Double-layer Steel Tube Hollow Concrete Column under Axial Compression

基于有限元软件建立了“十”字异形双层钢管空心混凝土柱在轴向压力下的有限元模型。根据有限元模拟分析,对“十”字异形双层钢管空心混凝土柱在轴向压力作用下进行研究,讨论了柱子在轴压作用下的极限承载力、荷载-位移曲线、破坏形态和延性性能等。结果表明:内钢管(D=50 mm)的设置能提高整体承载能力的25%左右,且延性提高,挖去内层混凝土后,对极限承载能力影响不明显;柱子高度越高对极限承载力的不利影响越大,延性降低;极限承载能力随夹层混凝土抗压强度的增大而增大但延性降低。将模拟与试验相比较,结果大致相同。

Based on the finite element software,the finite element model of the“+”shaped double-layer steel tube hollow concrete column under axial pressure was established.According to the finite element simulation analysis,the“+”shaped double-layer steel tube hollow concrete column under axial compression was studied,and the load-displacement curve,ultimate bearing capacity,failure form and ductility performance of the column under axial compression were discussed.The results show that the installation of the inner steel pipe(D=50 mm)can increase the overall load-bearing capacity by about 25%,and the ductility is improved.After the inner layer of concrete is excavated,the ultimate load-bearing capacity is not obvious;the higher the height of the column,the greater the adverse effect on the ultimate bearing capacity and the lower the ductility;the ultimate bearing capacity increases with the increase in the compressive strength of the sandwich concrete but the ductility decreases.Comparing the simulation with the experiment,the results are roughly the same.