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开口薄壁构件的翘曲可视为各板件面内弯曲的组合,因此无需确定截面弯心和翘曲惯矩等参数,也能获得构件抗力性能描述;单肢化的假想荷载分析及其结论的灵活综合,可清晰表述弯扭屈曲时复杂的荷载附加效应,并能在结论中自然反映以Wagner效应为代表的诸多复杂因素。基于上述措施,该文所提出的弯扭屈曲分析方法具有简单的推导过程和结论形式,无需引入复杂的板壳非线性分析理论,但解决了Bleich的方法中横向荷载Wagner效应缺失问题以及轴向偏心荷载与横向荷载所致弯矩的附加效应形式不统一的问题,并对多样化的截面构型、荷载类型及约束方式提供广泛适应性。对于各种典型的弹性弯扭屈曲问题,特别是其中目前尚存在广泛争议的单轴对称截面梁的侧向屈曲问题,该方法均取得了良好的对比分析结论。分析表明:把薄壁构件凝聚到轴上进行分析和结论表述这一传统措施造成二阶分析中的诸多困难,并可能导致不易察觉的疏漏,该文的单肢解析化思路有助于避免这些问题。
The warpage of the thin-walled members can be regarded as the combination of the in-plane bending of the plates. Therefore, it is not necessary to determine the parameters such as the cross-section center of curvature and the moment of inertia, as well as the description of the member’s resistance. The flexible synthesis makes it possible to clearly express the complicated load-added effect of flexural-torsional buckling and can naturally reflect many complex factors represented by the Wagner effect in the conclusion. Based on the above measures, the proposed method of buckling and buckling analysis has a simple derivation process and conclusion form, without introducing complex plate and shell nonlinear analysis theory, but solved the problem of Blewag method of Wagner effect of transverse load loss and axial Eccentric load and lateral load caused by the additional effect of the form of bending is not uniform, and a variety of cross-sectional configuration, load types and constraints to provide a wide range of adaptive. For all kinds of typical elastic buckling and buckling problems, especially for the lateral buckling problems of uniaxial symmetrical cross-section beams, which are still widely controversial, this method has achieved good comparative analysis conclusions. The analysis shows that the traditional method of condensing the thin-walled members onto the shaft for analysis and the conclusion shows that this traditional measure causes many difficulties in second-order analysis and may lead to imperceptible omissions. The unicolitic interpretation of this article helps to avoid these problem.