Local buckling behaviour of titanium-clad bimetallic steel circular hollow section stub columns

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures Pub Date : 2025-10-01 DOI:10.1016/j.tws.2025.114039

Chenyang Huang , Huiyong Ban , Yuanqing Wang , Yongjiu Shi

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Abstract

This paper investigates the local buckling behaviour of titanium-clad (TC) bimetallic steel circular hollow section (CHS) stub columns under compression through experimental and numerical studies. Five CHS stub columns were tested with measurement of four types of tensile coupons and local geometric imperfections. In parallel with the experimental investigation, FE models were established and validated with the consideration of welding joint construction, element types, and material strategies. After validation, a selected FE model was employed for parametric studies, where a total of 320 numerical simulations were derived with different diameter-to-thickness ratios, material combinations, and clad ratios. The existing design standards were evaluated with the parametric results, and recommendations for design methods for the TC bimetallic steel CHS were proposed. Additionally, the study demonstrates that clad ratios significantly affect the bearing capacity of the TC bimetallic steel CHS stub columns due to the different plastic hardening capability and elastic modulus of cladding and substrate layers. A modified design method based on prEN 1993-1-1:2018 was proposed to accurately account for the influence of clad ratio. The present study provides a foundation for developing more accurate cross-section design rules for TC bimetallic steel member in future research.

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包钛双金属钢圆空心截面短柱的局部屈曲行为

本文通过试验和数值研究，研究了包钛双金属钢圆空心截面短柱在压缩作用下的局部屈曲行为。对5根CHS短柱进行了四种拉伸张量和局部几何缺陷测量。在进行试验研究的同时，建立了考虑焊接接头结构、单元类型和材料策略的有限元模型并进行了验证。验证后，选择一个有限元模型进行参数化研究，在不同的径厚比、材料组合和包覆比下，共进行了320次数值模拟。利用参数化结果对现有设计标准进行了评价，并对TC双金属钢CHS的设计方法提出了建议。此外，研究表明，由于包层和衬底层的塑性硬化能力和弹性模量不同，包层比对TC双金属钢CHS短柱的承载能力有显著影响。提出了一种基于prEN 1993-1-1:2018的改进设计方法，以准确地考虑包层比的影响。本研究为今后研究TC双金属钢构件制定更精确的截面设计规则奠定了基础。

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

Thin-Walled Structures 工程技术-工程：土木

CiteScore

9.60

自引率

20.30%

发文量

801

审稿时长

66 days

期刊介绍： Thin-walled structures comprises an important and growing proportion of engineering construction with areas of application becoming increasingly diverse, ranging from aircraft, bridges, ships and oil rigs to storage vessels, industrial buildings and warehouses. Many factors, including cost and weight economy, new materials and processes and the growth of powerful methods of analysis have contributed to this growth, and led to the need for a journal which concentrates specifically on structures in which problems arise due to the thinness of the walls. This field includes cold– formed sections, plate and shell structures, reinforced plastics structures and aluminium structures, and is of importance in many branches of engineering. The primary criterion for consideration of papers in Thin–Walled Structures is that they must be concerned with thin–walled structures or the basic problems inherent in thin–walled structures. Provided this criterion is satisfied no restriction is placed on the type of construction, material or field of application. Papers on theory, experiment, design, etc., are published and it is expected that many papers will contain aspects of all three.