Models for the longitudinal shear resistance of composite slabs, and the use of non-standard test data

Design data for the longitudinal shear resistance of composite slabs, with associated safe-load tables, are provided by manufacturers of profiled sheeting, for use in the m-k design method. The data are usually based on analyses of tests, that may not be strictly in accordance with either of the Eurocode methods, as given in the final version of EN 1994-1-1 (Eurocode 4). Design of composite slabs based on the use of sheeting outside its country of origin may in future require demonstration of conformity to Eurocodes. Using the assumptions of the more recent partial-interaction method of Eurocode 4, a mechanical model for the m-k method is derived, and checked against test data. It enables resistances to longitudinal shear to be deduced from existing test results, for slabs with thickness, shear span, or properties of materials that differ from the properties of the slabs tested. This should greatly reduce the need for further testing.