Experimental Research on Buckling Performance and Design Methods for Cold-Formed Thin-Walled Equal-Legged Lipped Angle Steel Under Axial Compression

YAO Xingyou; LIU Yafei; GUO Yanli; RUAN Chuhang; CHEN Hou

doi:10.3724/j.gyjzG23102413

Volume 55 Issue 7

Jul. 2025

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YAO Xingyou, LIU Yafei, GUO Yanli, RUAN Chuhang, CHEN Hou. Experimental Research on Buckling Performance and Design Methods for Cold-Formed Thin-Walled Equal-Legged Lipped Angle Steel Under Axial Compression[J]. INDUSTRIAL CONSTRUCTION, 2025, 55(7): 216-226. doi: 10.3724/j.gyjzG23102413

Citation:

YAO Xingyou, LIU Yafei, GUO Yanli, RUAN Chuhang, CHEN Hou. Experimental Research on Buckling Performance and Design Methods for Cold-Formed Thin-Walled Equal-Legged Lipped Angle Steel Under Axial Compression[J]. INDUSTRIAL CONSTRUCTION, 2025, 55(7): 216-226. doi: 10.3724/j.gyjzG23102413

Citation:

YAO Xingyou, LIU Yafei, GUO Yanli, RUAN Chuhang, CHEN Hou. Experimental Research on Buckling Performance and Design Methods for Cold-Formed Thin-Walled Equal-Legged Lipped Angle Steel Under Axial Compression[J]. INDUSTRIAL CONSTRUCTION, 2025, 55(7): 216-226. doi: 10.3724/j.gyjzG23102413

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Experimental Research on Buckling Performance and Design Methods for Cold-Formed Thin-Walled Equal-Legged Lipped Angle Steel Under Axial Compression

doi: 10.3724/j.gyjzG23102413

1. School of Civil and Architectural Engineering, Jiangxi University of Water Resources and Electric Power, Nanchang 330099, China;
2. Jiangxi Provincial Engineering Research Center of the Special Reinforcement and Safety Monitoring Technology in Hydraulic & Civil Engineering, Jiangxi University of Water Resources and Electric Power, Nanchang 330099, China

Received Date: 2023-10-24
Available Online: 2025-09-12

Abstract

Abstract

In order to study the buckling performance and the bearing capacity design method of cold-formed thin-walled equal-legged lipped angle columns， axial compression tests were conducted on 32 LQ550 equal-legged lipped angle columns with different cross-sections and slenderness ratios. The results showed that long columns with small width-to-thickness ratios exhibited global flexural-torsional buckling， while short columns with larger width-to-thickness ratios experienced local buckling. Other specimens demonstrated the interactive buckling with local buckling and flexural-torsional buckling， and the specimens with torsional buckling all showed the post-torsional buckling strength. ABAQUS finite element software was then used to simulate the specimens. The simulation results were in good agreement with the test results， indicating that the established finite element analysis model was both reasonable and feasible. Therefore， the effects of the slenderness ratio， width-thickness ratio， and leg-lip ratio on the buckling performance of cold-formed thin-walled equal-legged lipped angle steel under axial compression were analyzed using finite element software. The analysis showed that the ultimate bearing capacity of the angle steel decreased greatly with the increase of slenderness ratio. When the angle steel had the same length， the ultimate bearing capacity increased with the increase of width-to-thickness ratio. Increasing the width of the lips enhanced the ultimate bearing capacity； however， when local buckling occurred at the lips， the rate of increase in the ultimate capacity slowed down. Finally， based on the test results， the effective width method and the direct strength method were proposed to calculate the bearing capacity of cold-formed thin-walled equal-legged lipped angle steel members under axial compression. The results of comparison with test and finite element analysis showed that the proposed methods were accurate and feasible.
- equal-legged lipped angle steel,
- flexural-torsional buckling,
- local buckling,
- effective width method,
- direct strength method,
- post-buckling strength

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References(19)

References

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