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Nowadays, with the use of steel plates of the high strength and thinner thickness, many new complicate shaped sections are used to improve the stability behavior. Cold-formed thin-walled 1 steel channel with complex edge stiffeners section is just one of them.

At present, the study about the stability behavior of the members with this section under axial pressure is rare. Now, the effective section method is adopted to calculate the load carrying capacity of coldformed thin-walled steel members at home and abroad. In recent years, Direct Strength Method DSM , a new calculating method for the load carrying capacity of cold-formed thin-walled steel member, is studied by a large number of foreign scholars.

This method can effectively make up for the lack of the effective section method. But this method only can calculate some certain section shapes with some specific boundary conditiongs.

The study and report about the use of the DSM on the members with new section shapes are rare. Cold-formed thin-walled steel channel with complex edge stiffeners members under axial pressure is included. Considering the above problems, in this paper a series of study about cold-formed thinwalled steel channel with complex edge stiffeners fixed-ended members under axial load were carried out meticulously, such as the failure modes , ultimate load-carrying capacity and its influence parameters etc.

And on this basis, the calculating method for the ultimate load-carrying capacity of cold-formed thin-walled steel channel with complex edge stiffeners fixed-ended and pinned-ended members under axial load was studied meticulously. The study content as follows: A large amount of finite element parametric analysis were performed on the failure modes and ultimate load-carrying capacity of cold-formed thin-walled steel channel with complex edge stiffeners fixed-ended members under axial load and to analyse the stability behaviors of fixedended members under axial load by changing parameter including the section form, slenderness ratio, width to thickness ratio and etc.

The effect rules of the above parameters on failure modes and the ultimate load-carrying capacity were also gained from the study. Based on the above study results for fixed-ended members under axial load and combined with the actual situation of our country, the study on the DSM for calculating the ultimate load carrying capacity of cold-formed thin-walled steel channel with complex edge stiffeners fixedended members under axial load was performed to gain a revised DSM formula.

Based on the results of the previous study and analysis for fixed-ended members under axial load, the DSM for the ultimate load-carrying capacity of steel channels with complex edge stiffeners fixedended members under axial load was contimue in-depth studied, and the calculating formula of the DSM was optimized. Combined with the above study results of the DSM for fixed-ended members under axial load and pinned-ended members under axial load, the uniform calculationg formula of the DSM for cold-formed thin-walled steel channel with complex edge stiffeners fixed-ended and pinned-ended members under axial load which meet the needs of engineering was established.

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Cold-Formed Steel Structures to the AISI Specification

The focus of this guide is principally on iron in buildings, but it is hoped that it will also be of interest and useful to bridge engineers. To give an historical overview of the structural use of iron in Scotland. The new material was strong and hard compared to bronze and could be hammered and ground to give a sharp, durable cutting edge. As iron in almost pure form, wrought iron is a ductile material. It has similar mechanical properties to modern mild steel, which is iron alloyed with around 0. Illustration 5 Wrought iron fracture A I inch


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