Youtian Wang , Boshan Chen , Peng Dai , Yuanqing Wang , Yuchen Song , Ke Jiang , Letian Hai
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引用次数: 0
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.
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.
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