The Constructor

Cold Formed/Light Guage Steel Section- Design

Civil Engineering

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The manufacturing processes have been significantly developed and different shapes of sheeting profile are easy to produce. Steel sheeting is also easy to bend to different shapes e.g. curved roof structures., cylindrical products e.g. culverts etc. The products are delivered with a huge range of possible coatings. Normally the coating is done by the manufacturer and so the products are ready to be used when delivered.

Cold-formed steel sheeting can be used to satisfy both structural and functional requirements. In this paper, the structural use is more thoroughly considered. Profiled steel sheeting is widely used in roof, wall and floor structures. In these structures, the profiled steel sheeting actually satisfies both the structural and functional requirements. In floor structures the steel sheeting is often used as part of a composite structure with concrete. In northern countries the roof and wall structures are almost always built with thermal insulation. The sound insulation and the fire insulation have also to be considered, when designing structures.

There are several codes for the design of profiled steel sheeting. Almost every country has a national code for this purpose, e.g. DIN-code in Germany, AISI-code in USA, etc. The structural design of profiled steel sheeting in Europe has to be carried out using the Eurocode 3: part 1.3, though there are several national application documents (NAD), where the national requirements are considered with the EC3. An extensive amount of tests has been carried out and analyzed to gather together the existing design codes, and there are numerous formulae in these codes that are based partly on theory and partly on experimental test results. Some of the important aspects of structural design of coldformed profiled steel sheeting is presented in this paper. Numerous different kind of fastening techniques are developed suitable for thin-walled structures. Suitable fasteners are bolts with nuts, blind rivets, self tapping screws, selfdrilling screws and some other kinds of fasteners.

The materials used in cold-formed thin-wall members have to satisfy certain criteria to be suitable for cold-forming and usually also for galvanising. The yield strength is normally
in the range of 220…350 N/mm2, but also some high-strength sheet steels with yield
strength of over 500 N/mm2 are used in some cases. The practical reasons i.e.
transportation, handling etc., limit the range of thickness of the material used in profiled sheeting.

A lot of interesting research projects have been carried out concerning the behaviour of profiled steel sheeting all over the world. Some of the current researches are shortly described in this paper. In different parts of the world the focus of the research is naturally on the regional problems. An example of this is Australia, where the main research area of cold-formed steel structures is concentrated on the problems caused by high-wind and storm loads.

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