Buckling behavior and design of large-size and high-strength steel angle under combined compression and biaxial bending

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL Thin-Walled Structures Pub Date : 2025-07-01 Epub Date: 2025-03-06 DOI:10.1016/j.tws.2025.113124

Yun Sun , Da Song , Shuxuan Sun , Yaojie Guo , Quan Zhao

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Abstract

This paper aims to investigate the behavior of large-size and high-strength steel angle (LHS) components under combined biaxial bending and axial compression. A theoretical analysis for angle sections subjected to combined action and the plastic development coefficient calculation method was performed. The behavior of 28 Q420 LHS beam-column components was tested, and the finite element model was developed and validated against the test result. The comprehensive parametric study was adopted to perform LHS beam-column components with different material grades, cross section sizes, slenderness ratios and loading eccentricities. Numerical results obtained from the parametric study were compared with the current design codes to provide accurate prediction of design strength. The research findings indicate that the angle section's elastic design approach is rather conservative, possessing a degree of plastic reserve. The eccentricity can alter the LHS beam-column components' failure mode, and the critical eccentricity characteristic becomes less apparent as the biaxial eccentricity increases. The proposed modified design formula for LHS components under combined action, can achieve reliable and accurate design predictions.

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大尺寸高强钢角钢在压缩和双轴弯曲联合作用下的屈曲行为及设计

本文旨在研究大尺寸高强钢角钢构件在双轴弯曲和轴压联合作用下的性能。对受联合作用的角截面进行了理论分析和塑性发展系数的计算方法。对28个Q420 LHS梁柱构件进行了性能试验，建立了有限元模型，并根据试验结果进行了验证。采用综合参数研究方法，对不同材料牌号、截面尺寸、长细比和加载偏心距的LHS梁柱构件进行了分析。将参数化研究得到的数值结果与现行设计规范进行了比较，以提供准确的设计强度预测。研究结果表明，角度截面的弹性设计方法较为保守，具有一定的塑性储备。偏心距可以改变LHS梁柱构件的破坏模式，且随着双轴偏心距的增大，临界偏心距特征变得不明显。提出的修正设计公式在综合作用下，可以实现可靠、准确的设计预测。

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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.