Study on Buckling Strength Reduction Factor for Vertical Vessel Skirts With Access Opening by Elastic-Plastic Analysis

Takuma Takahashi, S. Kataoka, Yoshiaki Uno, Toshikazu Miyashita
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Abstract

Access opening is a key geometric feature of vertical vessel skirts. To ensure the structural stability of skirts, buckling strength reduction caused by openings shall be numerically evaluated. In the previous study, Buckling Strength Reduction Factor (BSRF) was introduced as a design factor representing the effects of openings. However BSRF is based on the elastic bifurcation buckling under axial compressive load. The relations between BSRF and practical design conditions, such as bending moment, material plasticity, and local deformation, are not yet evaluated. The purpose of this paper is to develop the buckling design method for vertical vessel skirts with access opening by investigating the relation between BSRF in consideration of practical design conditions and conventional design concepts for straight cylinder. The finite element analyses of buckling strength were conducted for cylindrical shells with and without openings under bending moments. In addition, nonlinear buckling behaviors of skirts with opening were studied by elastic-plastic analyses and limit-load analyses. These studies revealed the relation between BSRF and conventional buckling design concepts. Based on these results, a new buckling design approach which includes the application BSRF was proposed. This proposed approach provides a practical guide for buckling design of vertical vessel skirts with access opening.
基于弹塑性分析的带通道开口垂直容器裙边屈曲强度折减系数研究
通道开口是垂直容器裙摆的关键几何特征。为了保证裙边的结构稳定性,应对开口引起的屈曲强度降低进行数值计算。在之前的研究中,引入了屈曲强度折减因子(BSRF)作为表征开孔影响的设计因子。而BSRF是基于轴向压缩载荷下的弹性分岔屈曲。BSRF与实际设计条件(如弯矩、材料塑性和局部变形)之间的关系尚未得到评估。本文的目的是通过研究考虑实际设计条件和传统直筒设计理念的BSRF之间的关系,发展具有通道开口的垂直容器裙边的屈曲设计方法。对有开口和无开口圆柱壳在弯矩作用下的屈曲强度进行了有限元分析。此外,通过弹塑性分析和极限载荷分析,研究了带开口裙摆的非线性屈曲行为。这些研究揭示了BSRF与传统屈曲设计理念之间的关系。在此基础上,提出了一种新的屈曲设计方法,其中包括应用BSRF。该方法为带通道开口的垂直容器裙边的屈曲设计提供了实用的指导。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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