Experimental and numerical study on lateral-torsional buckling of welded QN1803 high-strength stainless steel I-girders

IF 5.7 1区工程技术 Q1 ENGINEERING, CIVIL Thin-Walled Structures Pub Date : 2025-03-10 DOI:10.1016/j.tws.2025.113190

Youtian Wang , Boshan Chen , Peng Dai , Yuanqing Wang , Yuchen Song , Ke Jiang , Letian Hai

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Abstract

Recently, high-strength stainless steel, known as QN1803, has gained popularity in the steel industry due to its lower nickel content, approximately 2.0 %, which makes it more cost-effective than traditional EN 1.4401 stainless steel. The moment capacities of such thin-walled I-girders are influenced by lateral-torsional buckling when they are not laterally restrained adequately. However, existing studies have not yet investigated the lateral-torsional buckling behaviour of such I-girders. This issue is addressed in this study. An experimental program was conducted, reporting a total of six experimental results. Traditional four-point bending tests were performed to measure the displacement versus load relationship at the mid-span. An advanced numerical model considering the initial geometric imperfection and residual stresses was established and calibrated against the test results the authors and other researchers reported. Subsequently, a parametric study including 66 finite element models was undertaken. The test results indicated that the lateral-torsional buckling strength of QN1803 high-strength stainless steel I-girders increased by 35 % on average compared to commonly used EN 1.4401 stainless steel I-girders. The obtained test and parametric study results were further used to evaluate the design methods outlined in Australian Standard AS4100 (2016), European code EN 1993–1–1 (2023) and American Standard AISC 360–22 (2022). The comparison revealed that the current design specifications are inadequate for accurately predicting the lateral-torsional buckling strength of such I-girders.

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最近，被称为 QN1803 的高强度不锈钢因其较低的镍含量（约 2.0%）而在钢铁行业大受欢迎，这使得它比传统的 EN 1.4401 不锈钢更具成本效益。当这种薄壁工字钢的侧向约束不足时，其弯矩承载能力会受到侧向扭转屈曲的影响。然而，现有研究尚未对此类工字梁的侧向扭转屈曲行为进行调查。本研究将探讨这一问题。本研究开展了一项实验计划，共报告了六项实验结果。进行了传统的四点弯曲试验，以测量中跨处的位移与荷载的关系。考虑到初始几何缺陷和残余应力，建立了一个先进的数值模型，并根据作者和其他研究人员报告的试验结果进行了校准。随后，进行了包括 66 个有限元模型在内的参数研究。试验结果表明，与常用的 EN 1.4401 不锈钢工字梁相比，QN1803 高强度不锈钢工字梁的侧向扭转屈曲强度平均提高了 35%。获得的试验和参数研究结果被进一步用于评估澳大利亚标准 AS4100（2016 年）、欧洲标准 EN 1993-1-1（2023 年）和美国标准 AISC 360-22（2022 年）中概述的设计方法。比较结果表明，目前的设计规范不足以准确预测此类工字梁的侧向扭转屈曲强度。

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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.