蜂窝梁弹性弯扭屈曲承载力的简化计算方法研究

Study on simplified calculation method of elastic flexural-torsional buckling bearing capacity of castellated beams

蜂窝梁构造复杂,对其承载力进行精确计算困难。为了研究蜂窝梁弹性弯扭屈曲承载力,在对蜂窝梁截面各特征值进行简化计算的基础上,用实腹H型钢梁的弹性弯扭屈曲临界荷载计算理论研究了蜂窝梁在不同荷载作用形式下的弹性弯扭屈曲承载力。使用ABAQUS软件对蜂窝梁的弹性弯扭屈曲承载力进行特征值屈曲分析,并与理论计算结果进行对比,验证了计算式的有效性。最后,通过分析不同因素对蜂窝梁弹性弯扭屈曲承载力的影响得出:高跨比影响最大;扩张比影响次之;距高比影响最小,可以忽略。

It is difficult to calculate the bearing capacity of castellated beams because of the complex structure.To investigate the elastic flexural-torsional buckling bearing capacity of castellated beams under different kinds of load,the calculation theory of elastic flexural-torsional buckling of H-shaped steel beams is applied,based on simplifying of the section＇s characteristic values.At the same time,the eigenvalue buckling analyses are done using ABAQUS software.The theoretically calculation results are in good agreements with those from software,which prove the method given in this paper to be reasonable and useful.Moreover,the effects of different factors on the elastic flexural-torsional buckling bearing capacity of castellated beams are analyzed.The results show that depth-span ratio has the biggest influence,while distance-height ratio has the least effect.