Cold-formed lipped channel sections have been widely used in light gauge steel construction. Among the several possible buckling modes, the distortional buckling mode involving rotational deformation of the flange–lip combination about the flange–web junction is often the strength-governing mode. While many studies have been carried out on this buckling mode, the method of Lau and Hancock (J. Struct. Eng. ASCE 113 (1987) 1063), which models the phenomenon as the flexural–torsional buckling of the flange–lip combination with elastic restraints from the web appears to be the most effective in producing a relatively simple closedform solution for design use. This article extends the Lau and Hancock method, which was developed for axially loaded columns to beam-columns subjected to combined axial compression and biaxial bending. Particular attention is paid to the case of axial compression in combination with uniaxial bending in the plane of symmetry. Numerical results from the present closed-form solution are compared with those from the finite strip method, showing a close agreement between the two. The numerical results also lead to a number of useful observations on the distortional buckling behavior of these beam-columns, which should be useful in the future development of a simplified solution for direct design use.

Large elevated steel silos for the storage of bulk solids generally consist of a cylindrical vessel above a conical discharge hopper supported on a cylindrical skirt. The cone-cylinder-skirt transition junction is subject to a large circumferential compressive force which is derived from the horizontal component of the meridional tension in the conical hopper, so either a ring is provided or the shell walls are locally thickened to strengthen the junction. Extensive theoretical studies have examined the buckling and collapse strengths of these junctions, leading to theoretically based design proposals. However, no previous experimental study on steel silo transition junctions has been reported due to the considerable difficulties associated with testing these thin-shell junctions at model scale. This paper presents the results of a series of tests on cone-cylinder-skirt-ring junctions in steel silos under simulated bulk solid loading. In addition to the presentation of test results including geometric imperfections and failure behavior, the determination of buckling modes and loads based on displacement measurements is examined in detail.

建造在软土地基上的大型储罐会产生各种沉降变形，其中罐周不均匀沉降对结构的影响最为不利本文首先对软土地基上大型储罐沉降的主要类型和特点做简要总结，然后分析罐周不均匀沉降对不同类型钢储罐结构(浮顶罐和固定顶罐)的影响，并回顾了不均匀沉降下钢储罐结构应力分析的有关研究文中还指出，目前由岩土工程师凭借经验提出的储罐地基变形允许值从结构工程的角度看不尽合理，合理的取值应充分考虑储罐结构对地基变形的响应

Cone-cylinder intersections are used commonly in pressure vessels and piping, and internal pressurization is often an important loading condition. For the intersection of the large end of a cone and a cylinder, internal pressurization causes large circumferential compressive stresses in the intersection. These stresses can lead to failure of the intersection by either axisymmetric collapse or non-symmetric buckling. This paper first presents a brief summary of recent experiments on cone-cylinder intersections under internal pressure.Arational finite element model based on the experimental and the corresponding numerical results is next described. Finite element results from a major parametric study on the postbuckling behaviour and strength of cone-cylinder intersections employing this finite element model are then presented. Finally, a design proposal in the Eurocode format for internally pressurized cone-cylinder intersections is established for practical use.

利用数值方法系统研究带矩形开口的薄壁圆柱壳的稳定性能。对矩形开口的周向角摩、高度、轴向位置、开口数量等几何参数进行比较分析，并考察两类几何初始缺陷对结构稳定性的影响•分析表明，影响矩形开口圆柱壳轴压下稳定性的主要因素是周向开口角度，屈曲荷载随开口角度的增大而线性下降，而开口高度及开El的轴向位置对屈曲荷载的影响很小。此外，矩形开口圆柱壳对以特征值屈曲模态分布的初始缺陷并不敏感，但对周向轴对称凹陷十分敏感。