Abstract
Due to its remarkable combination of high yield strength and cost-effectiveness, S35657 austenitic stainless steel has gained increasing attention in the field of construction engineering. This paper delves into the global stability performance of S35657 stainless steel welded long columns. Leveraging test results from 13 welded long columns, consisting of 4 welded box-section columns and 9 welded I-section columns, a numerical simulation analysis was conducted to scrutinize the bearing capacity and failure modes of each specimen. Utilizing validated numerical models, a parametric analysis was undertaken, exploring factors such as cross-sectional classification, slenderness ratio and initial imperfection. Subsequently, the buckling curves for S35657 austenitic stainless steel welded box-section and I-section long columns, both around the major and minor axes, were evaluated using existing test results and numerical outcomes. Through data fitting and reliability analysis, buckling curves tailored to S35657 austenitic stainless steel welded box-section and I-section long columns for global buckling were proposed for the first time, providing guidance for relevant designs based on the European code (prEN 1993-1-4), the American code (SEI/ASCE 8-22) and the Chinese specification (CECS 410: 2015).
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