Youtian Wang , Boshan Chen , Jia Wang , Lisheng Luo , Beibei Li , Quanxi Ye , Letian Hai
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引用次数: 0
Abstract
QN1803, a newly developed high-strength stainless steel, offers a tensile yield strength approximately 40% higher than the commonly used EN1.4301 while reducing costs by 20% due to its lower nickel content. This material shows significant promise for use in plate girders with web openings, which are prone to patch loading buckling caused by moving loads. Despite its potential, research on the patch loading performance of such girders is limited. To address this gap, a comprehensive experimental program was undertaken, including 14 patch loading tests. The program examined three different hole size ratios: 0.2, 0.4, and 0.6. Initial geometric imperfections were measured prior to the tests, and a numerical modelling approach was developed and validated using the experimental data. A parametric study comprising 72 FE models was also conducted to investigate the effect of key variables on the ultimate strength, the patch loading length ratio, web aspect ratio, web slenderness, and hole size ratio were investigated. The test results revealed that for specimens with a hole size ratio of 0.6, the presence of web openings reduced the ultimate strength by 11.5% compared to girders with solid webs. To evaluate the accuracy of existing design specifications, the test and numerical results were used to assess design methods outlined in the Chinese code (GB 50017, 2017), the European code (EN 1993–1-5, 2006), and the American Specification (ANSI/AISC 360–22, 2022), despite these codes being primarily developed for girders with solid webs. The analysis concluded that current design specifications, with the exception of ANSI/AISC 360–22 (2022), are inadequate for accurately predicting the reduced patch loading resistance of QN1803 I-shaped girders with web openings.
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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