Abstract
Using the current direct strengths method to predict the bearing capacity of channels with complex edge stiffeners and stiffeners in the web, it will make the excessively conservative results to the test data for it couldn’t account for the interaction between distortional and local buckling. In order to study the method for bearing capacity of channels with complex edge stiffeners and web stiffeners under axial compression, the paper revised the current direct strengths method and new proposals considered distortional and local interaction buckling were made. The proposed method was verified by the finite element analysis results and the test results. It shows that the member strength predicted by the proposed method is more accurate than the present method and agrees well with the test data. Furthermore, compared with the results of the finite element method and hand method, the hand method for calculating elastic buckling critical stress of web-stiffened lipped channels with complex edge stiffeners was validated.
Highlights
Cold-formed steel sections are commonly used in a variety of applications including residential construction
Effective width method is the common approach in current codes for all countries, but the process of calculation is too complicated and the influence of distortional buckling is not considered
Its application to members affected by distortional-local interaction buckling is still under development
Summary
Cold-formed steel sections are commonly used in a variety of applications including residential construction. Effective width method is the common approach in current codes for all countries, but the process of calculation is too complicated and the influence of distortional buckling is not considered. Direct strength method (DSM) developed recently is able to handle both local and distortional effects and has simple but accurate calculation. Its application to members affected by distortional-local interaction buckling is still under development. Accepted DSM for channels with complex edge stiffeners and web stiffeners is lacking. About channels with complex edge stiffeners and web stiffeners under axial compression, there is no well established method. The paper deals with the ultimate strength and design of pin-ended channel columns with complex edge. Stiffeners and web stiffeners under axial compression. The aim of this paper is to put forward a method considered distortional-local interaction buckling
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