Community Research and Development Information Service - CORDIS


In order to help engineers to take advantage of the improved buildability of cold formed sections, the structural implications of the presence of openings were examined thoroughly in this research project. Experimental and theoretical studies, including finite element analysis, were carried out to compare the structural performances of sections with and without openings. The effects of openings on local web buckling, web crippling and moment resistances, and stress distribution around the openings with or without stiffeners were also studied. It was found that the presence of openings in cold formed sections may not reduce their web crippling and moment resistances significantly. In typical floor construction, the presence of single openings in the sections may reduce the moment resistances of the beams by only 5% to 10%, provided that the openings are located at specific positions. For typical sections with multiple openings, the reduction in their moment resistance is unlikely to exceed 15%. Based on the test results, a design method for sections with openings has been developed and is presented as a supplement to the normal design of cold formed sections. Simplified design rules are also presented to assist engineers in initial section selection.

Additional information

Authors: GODWIN M J, British Steel plc, London (GB);CHUNG K F, British Steel plc, London (GB);GRIFFITHS D A, British Steel plc, London (GB)
Bibliographic Reference: EUR 17986 EN (1998) 189pp., ECU 31.50
Availability: Available from the (2)
ISBN: ISBN 92-828-3358-5
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