Q420镀锌焊接圆管轴压整体稳定试验研究

Experimental study on overall buckling behavior of Q420 high strength welded galvanized tubes under axial compression

为了研究Q420高强度镀锌焊接圆钢管轴压柱的整体稳定性能,进行了轴压静力试验,研究了失稳破坏形态和极限承载力,通过计算得到其稳定系数φ,并与现行钢结构设计规范的柱子曲线进行对比.结果表明,试验实测得到的稳定系数φ明显高于我国现行钢结构设计规范所规定的焊接圆钢管所在的b类截面柱子曲线,甚至高于a类截面柱子曲线;同时,对镀锌与未镀锌圆钢管柱的轴压受力性能进行对比分析,结果表明,焊接圆钢管试件经过热镀锌处理之后轴压整体稳定承载力有所提高.

To investigate the overall buckling behavior of Q420 high strength welded gavalized steel tubes, an axial compression column test was conducted, the buckling modes and ultimate strength were analyzed, and the buckling strength of the specimens were calculated, which were compared with the column curves in the Chinese code. It shows that the stability factor ~p calculated from test results is much higher than that calculated according to the Chinese code. At the same time, the comparison of axial compressive test result between galvanized round tubes and the ungalvanized ones is introduced, and the results show that the hot galvanizing processing improves the bearing capacity.