The Open Civil Engineering Journal

ISSN: 1874-1495 ― Volume 13, 2019

Design Reliability Analysis of Cold-Formed Thin-Walled Steel Members with Lipped Channel Sections Considering Distortional Buckling

Yao Xingyou1, 2, *
1 Nanchang Institute of Technology, Jiangxi Province Key Laboratory of Hydraulic and Civil Engineering Infrastructure Security, Nanchang, Jiangxi 330099, China
2 Nanchang Institute of Technology, Jiangxi Provincial Engineering Research Center of the Special Reinforcement and Safety Monitoring Technology in Hydraulic & Civil Engineering, Nanchang 330099, China



Based on the experimental results of cold-formed thin-walled steel lipped channel sections, the uncertainty of calculating mode of load-carrying capacity using effective width method considering distortional buckling for different material types cold-formed steel compressed members was researched, and the uncertainties of material strength and geometric characteristics of the typical sections were statistically analyzed.


According to the recommended resistance of partial coefficient in the draft of Technical code of cold-formed steel structures (GB50018-), the reliability indexes of cold-formed thin-walled steel lipped channel sections under compression were investigated using the improved first-order second-moment method considering different possible external loading combinations.


The analyzed results show that, using the recommended resistance partial coefficient in the code draft, the reliability indexes of the compressed members with width-thickness ratio within the limitation of code draft can well met the target reliability index. The suitability of the corresponding calculating modes of load-carrying capacity considering distortional buckling was established.

Keywords: Cold-formed thin-walled steel, Lipped channel sections, Distortional buckling, Effective width method, Reliability, Width-thickness.

Article Information

Identifiers and Pagination:

Year: 2017
Volume: 11
First Page: 906
Last Page: 918
Publisher Id: TOCIEJ-11-906
DOI: 10.2174/1874149501711010906

Article History:

Received Date: 07/08/2017
Revision Received Date: 30/09/2017
Acceptance Date: 13/10/2017
Electronic publication date: 21/11/2017
Collection year: 2017

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© 2017 Yao Xingyou.

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* Address correspondence to this author at the Nanchang Institute of Technology, Jiangxi Province Key Laboratory of Hydraulic and Civil Engineering Infrastructure Security; Nanchang Institute of Technology, Jiangxi Provincial Engineering Research Center of the Special Reinforcement and Safety Monitoring Technology in Hydraulic & Civil Engineering, Nanchang 330099, China; Tel: 15079190103; E-mails:,


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