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对自由端侧向位移和扭转简支约束、自由端仅扭转约束和自由端仅简支扭转弹性约束条件下,双轴对称工字形截面悬臂梁的稳定性进行研究,并提出临界弯矩的计算公式。这一计算公式能够考虑悬臂梁长细比的变化,以及横向荷载作用点沿截面高度方向变化对其临界弯矩的影响。通过与有限元结果的比较可以发现,所提出的计算公式可以获得精度良好的临界弯矩值。
The stability of biaxial symmetrical I-shaped cantilever beams under lateral constraint and torsional simple constraint, only torsional constraint of free end and only simple support torsional elastic constraint of free end are studied, and the calculation of critical moment formula. This formula can take into account the slenderness ratio of the cantilever beam and the influence of the transverse load acting point along the height of the cross section on the critical moment. By comparing with the results of finite element, it can be found that the proposed calculation formula can obtain the critical moment value with good accuracy.