Behaviour of tubular members and cylindrical shells under non-uniform moment gradients

非均匀力矩梯度下管状构件和圆柱壳的行为

• 批准号: EP/N024060/1
• 负责人: Adam Jan Sadowski
• 金额: $ 12.59万
• 依托单位: Imperial College London
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2016
• 资助国家: 英国
• 起止时间: 2016 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FN024060%2F1
• 关键词: Behaviour; tubular; members; cylindrical; shells

Tubular or cylindrical hollow steel members are used extensively as load-bearing members, piles, pipelines, wind turbine support towers, chimneys as well as tanks and silos. However, their treatment under bending in current design practice is surprisingly simplistic and varies between excessive conservatism and potentially serious unconservatism as a consequence of the widespread lack of understanding of the nonlinear phenomena that govern their behaviour. The effects are dominated by local buckling, strongly influenced by cross-section ovalisation, with the complexity of plasticity, post-buckling, imperfections and non-uniform load conditions. In particular, ovalisation under bending plays a critical role in reducing the buckling resistance by up to 50% in even relatively short members, but no account of it is taken in normal design. With the aid of modern computational tools and processing power, it has only recently become possible to overcome the combined complexities and make significant advances in this field. This proposal seeks to investigate numerically the nonlinear buckling behaviour of tubulars with a very wide range of lengths and thicknesses under the most commonly occurring and realistic non-uniform moment distributions. No known study has explored these effects to date, and no safe recommendations for design can be made. It is envisaged that this project will deliver a significant contribution to fundamental structural mechanics and lead to greatly improved European design guidelines, permitting substantial efficiency savings in modern steel construction in the UK and beyond.

管状或圆柱体空心钢构件被广泛用作承载成员，桩，管道，风力涡轮机支撑塔，烟囱以及坦克和筒仓。但是，由于当前设计实践中的弯曲弯曲是令人惊讶的简单化，并且由于对控制其行为的非线性现象的广泛了解，过度保守主义和潜在严重的无保守性。该作用以局部屈曲为主，受到横截面卵巢化的强烈影响，其复杂性，弯曲后，不完美和不均匀的负载条件的复杂性。特别是，弯曲下的卵净化在将屈曲抗性减少50％的成员中起着至关重要的作用，但在正常设计中没有对屈曲的抗性。借助现代计算工具和处理能力，直到最近才有可能克服合并的复杂性并在该领域取得重大进步。该提案旨在以数值方式研究管状的非线性屈曲行为，其长度和厚度在最常见和最现实的不均匀矩分布下。迄今为止，尚无已知研究探讨这些效果，并且无法对设计提出安全建议。可以预见，该项目将为基本的结构力学做出重大贡献，并大大改进了欧洲设计指南，从而可以节省大量的英国现代钢结构效率。

项目成果

Cylindrical shells under uniform bending in the framework of Reference Resistance Design

参考阻力设计框架中均匀弯曲下的圆柱壳

• DOI: 10.1016/j.jcsr.2019.105920
• 发表时间: 2020
• 期刊: Journal of Constructional Steel Research
• 影响因子: 4.1
• 作者: Wang J

On the gradient of the yield plateau in structural carbon steels

• DOI: 10.1016/j.jcsr.2016.11.024
• 发表时间: 2017-03-01
• 期刊: JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH
• 影响因子: 4.1
• 作者: Sadowski, Adam J.;Rotter, J. Michael;Ummenhofer, Thomas
• 通讯作者: Ummenhofer, Thomas

Influence of ovalisation on the plastic collapse of thick cylindrical tubes under uniform bending

均匀弯曲条件下椭圆化对厚圆柱管塑性破坏的影响

• DOI: 10.1016/j.ijpvp.2018.05.004
• 发表时间: 2018
• 期刊: International Journal of Pressure Vessels and Piping
• 影响因子: 3
• 作者: Wang J

Buckling of elastic cylindrical shells under symmetric but non-uniform bending moment distributions

对称但非均匀弯矩分布下弹性圆柱壳的屈曲

• 发表时间: 2017
• 作者: Wang J

Elastic Imperfect Cylindrical Shells of Varying Length under Combined Axial Compression and Bending

• DOI: 10.1061/(asce)st.1943-541x.0002560
• 发表时间: 2020-04
• 期刊: Journal of Structural Engineering-asce
• 作者: Jie Wang;A. Sadowski