Q420双角钢组合截面偏压构件弹塑性弯曲屈曲

通过试验研究了特高压输电塔塔身主材规格为L160×12、L160×14、L160×16的3种Q420高强双角钢十字组合截面偏压构件的破坏模式,试验结果表明此种构件均以整体弹塑性弯曲屈曲破坏为主。基于改进逆算单元长度法编制相应程序,计算得到了这3种角钢规格在不同长细比并考虑残余应力情况下截面的弯矩轴力相关曲线,提出适用于此类截面形式的弯矩作用平面内稳定的建议计算公式及柱子曲线。引用的非线性幂函数模型能较好的反映此类偏压构件在等端弯矩受力作用下杆件端部弯矩与杆端转角的弯矩转角关系。

Elastoplastic Bending Buckling of Q420 Eccentric Compression Members with Double-angle Combined Cross-section

The experiments were carried out to investigate the behavior and failure modes of Q420 double-angle combined cross-section members whose specification were L160×12,L160×14,L160×16.The results show that all the members fail with an elastoplastic bending buckling.Based on the improvement of the inverse calculation segment length method and some relevant procedures,the related curves of axial force and moment with different specifications,different slenderness ratios and residual stresses were calculated.The calculation method of in-plane stability and column curves were proposed.The nonlinear power function model is appropriate for such members＇ moment-rotation relations under equal bending moments.