钢箱-混凝土梁局部屈曲分析与试验研究

新型钢箱-混凝土梁通过在钢箱受压区部分充填混凝土,既有效地提高了受压区钢板的稳定性,又较好地发挥了混凝土的抗压能力,大大地改善了构件的抗弯性能。通过4根钢箱-混凝土梁和2根钢箱梁试件的试验研究,考察了钢箱-混凝土梁受力全过程的特点,着重研究钢箱-混凝土梁钢板的局部屈曲特征,其屈曲行为类似于刚性基底上非受载边弹性约束的单向受压板的屈曲行为,用能量法建立了刚性基底上沿非受载边弹性约束、面内受压矩形板的屈曲强度计算公式,研究结果表明,钢箱-混凝土受压区局部稳定性明显提高,所提出的方法用于顶板局部屈曲强度计算,计算结果与试验结果较吻合。

Test and analysis on local buckling behavior of concrete-filled steel box composite beam

By filling concrete in steel box partially,the new type concrete-filled steel box composite beams enhanced the stability of component steel plates,increased the compressing ability of concrete better,and improved the bending behavior of the member greatly.Four concrete-filled steel box beams and two steel box beams were investigated experimentally to study the whole loading process and the local buckling of the beams.An analytical study of local buckling of rectangular plate in contact with a rigid medium,rotationally restrained elastically along unloaded edges and subjected to in-plane axial action,was presented.The results show that the local buckling of the beam's top plate is familiar to that of rectangular plate in contact with a rigid medium.The local stability of concrete-filled steel box improves evidently.This theory and method can be used to calculate the local buckling strength of the flange.The calculated results are in good agreement with the experimental results.