A mechanics-based design approach to local buckling of thin-walled cross-sections

IF 3.8 3区工程技术 Q1 MECHANICS

International Journal of Solids and Structures Pub Date : 2025-05-24 DOI:10.1016/j.ijsolstr.2025.113487

Rupert Annison, Jurgen Becque

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引用次数: 0

Abstract

A new methodology for the design of thin-walled cross-sections against local buckling is presented. Unlike the currently codified approaches (the Effective Width Method and the Direct Strength Method), which are based on empirical curve-fitted equations, the new method is rational in nature: a differential equation governing the post-local buckling behaviour of thin-walled cross-sections is established, combined with a failure criterion based on first yield of the membrane stresses, and solved using a finite element scheme. Owing to its solid theoretical fundamentals, the approach is applicable across all possible cross-sectional shapes.

To provide an initial proof-of-concept of the new method, an experimental campaign was devised, comprising 22 axial compression tests on cold-formed steel stub columns with a wide range of cross-sectional geometries. All specimens failed by local buckling. The average ratio of the predicted to the experimentally measured capacity was 0.96, with a standard deviation of just 2.9%, and the new approach clearly outperformed the current design standards.

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基于力学的薄壁截面局部屈曲设计方法

提出了一种抗局部屈曲薄壁截面设计的新方法。与现有的基于经验曲线拟合方程的方法（有效宽度法和直接强度法）不同，新方法本质上是合理的：建立了控制薄壁截面局部后屈曲行为的微分方程，结合基于膜应力首次屈服的破坏准则，并使用有限元方案进行求解。由于其坚实的理论基础，该方法适用于所有可能的横截面形状。为了提供新方法的初步概念验证，设计了一项实验活动，包括对具有广泛横截面几何形状的冷弯钢短柱进行22次轴压测试。所有试件均因局部屈曲而失效。预测容量与实验测量容量的平均比值为0.96，标准差仅为2.9%，明显优于现行设计标准。

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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来源期刊

International Journal of Solids and Structures 物理-力学

CiteScore

6.70

自引率

8.30%

发文量

405

审稿时长

70 days

期刊介绍： The International Journal of Solids and Structures has as its objective the publication and dissemination of original research in Mechanics of Solids and Structures as a field of Applied Science and Engineering. It fosters thus the exchange of ideas among workers in different parts of the world and also among workers who emphasize different aspects of the foundations and applications of the field. Standing as it does at the cross-roads of Materials Science, Life Sciences, Mathematics, Physics and Engineering Design, the Mechanics of Solids and Structures is experiencing considerable growth as a result of recent technological advances. The Journal, by providing an international medium of communication, is encouraging this growth and is encompassing all aspects of the field from the more classical problems of structural analysis to mechanics of solids continually interacting with other media and including fracture, flow, wave propagation, heat transfer, thermal effects in solids, optimum design methods, model analysis, structural topology and numerical techniques. Interest extends to both inorganic and organic solids and structures.