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与承受均匀外部压力作用下的柱状壳体相比,承受不均匀风压的柱状壳体表现出不同的屈曲性能。不同的长宽比下,会出现相当复杂多样的屈曲模式;线性和非线性屈曲分析的结果也会有很大的不同。相比之下,除了较短的柱体或边界条件发生变化外,在均匀外压力作用下,柱体常出现环向失稳,且受几何变化的影响很小。对风压力下厚度均匀的锚固短柱壳和长度适中的柱壳进行了广泛的研究,旨在获得筒仓和锚固贮水池设计的有用信息,以防止其在风载作用下发生屈曲。线性和非线性有限元分析结果表明,短圆筒中出现环向受压失稳模式。对长度适中的柱,截面出现呈椭圆状的前屈曲对屈曲强度有重要的影响。参考均匀外压下的传统临界值,得到风荷载下线性和非线性临界滞止压力的经验公式。简要探讨了屈服和缺陷敏感性的影响。
Cylindrical shells subjected to non-uniform wind pressure exhibit different buckling properties than cylindrical shells subjected to uniform external pressure. Different aspect ratio, there will be quite complex and diverse modes of flexion; linear and nonlinear buckling results will be very different. In contrast, except for the shorter cylinder or boundary conditions, the cylinder often appears circular instability under the influence of uniform external pressure, and the influence of geometric changes is small. Extensive research has been conducted on uniform thicknesses of short and long-length cylindrical shells under wind pressure in order to obtain useful information on the design of silos and anchorage reservoirs to prevent their buckling under wind loads. The results of linear and nonlinear finite element analysis show that ring buckling instability mode appears in the short cylinder. For moderately lengthd columns, the pre-buckling with an oval cross section has an important effect on buckling strength. With reference to the traditional critical value under uniform external pressure, empirical formulas of linear and nonlinear critical stagnation pressure under wind load are obtained. The effects of yield and defect sensitivity are briefly discussed.