Q420焊接圆钢管轴心受压稳定性能试验和设计方法研究

EXPERIMENTAL STUDY ON THE BUCKLING BEHAVIOR OF Q420 HIGH STRENGTH STEEL WELDED TUBES UNDER AXIAL COMPRESSION AND DESIGN METHODS

该文进行了15个Q420高强度钢材埋弧焊接圆钢管柱轴心受压试验研究,基于试验结果总结了其失稳变形特征,分析比较了15个试件的稳定系数与我国规范柱子曲线计算值的关系,并验证了有限元模型的可靠性。基于有限元参数分析计算结果,对比60个试件的稳定系数与我国规范柱子曲线计算值的关系,对Q420高强度钢材埋弧焊接圆钢管的整体稳定设计方法提出两种建议:一是对于我国规范柱子曲线选择的建议,即对于Q420埋弧焊接圆钢管可以按a类截面计算其稳定承载力;二是更新我国柱子曲线整体稳定系数φ的计算参数α1、α2、α3,建议了一条新的设计曲线。

The axial compression column test was conducted to investigate the overall buckling behavior of Q420 high strength submerged-arc welded steel tubes under axial compression, including 15 specimens. Based on the test results, the characteristics of buckling deformations were summarized and the relationship about buckling coefficients between the 15 test results and the Chinese code curves were compared, and the reliability of the finite element models was validated. Based on the calculation results of the parametric analysis using the finite element models, the buckling coefficients from the 60 calculated results of the finite element analysis and the Chinese code curves were compared. Finally, this paper proposed two kinds of suggestions about the overall buckling design method of the Q420 high strength submerged-arc welded steel tubes: one is for the choice of column curves in the Chinese code, that is, members under axial compression could be calculated as class-a section for its buckling capacity; the second suggestion was that a new column curve was suggested, in which the calculation parameters α1, α2, α3 to calculate the buckling coefficient φ of Chinese design code were updated.