Abstract
The results of a parametric study on ten short-span composite beam tests with small degrees of shear connection between 12 and 46% are presented. The beam tests were conducted using composite slabs with two modern forms of profiled steel sheeting. Important parameters of the shear connection, such as stud diameter, number of studs per rib, reinforcement pattern, welding procedure and concrete strength, were varied. All the test configurations were selected in accordance with a previously conducted study on the behaviour of shear connectors in push-out specimens. A comparison of the bending resistance of the beam tests and the calculated plastic bending resistance is presented. The shear connector resistances were taken either from the push-out test results or from the analytical methods of Konrad, EN 1994-1-1 and Nellinger. Evaluation of the push-out and beam test results showed that the current shear connector resistances in EN 1994-1-1 insufficiently predict the observed concrete failure modes and resistances in the presence of modern forms of steel decking. New approaches to the shear connector resistance proposed by Konrad and Nellinger led to more accurate predictions of the shear resistance of headed studs and the plastic bending resistance of the composite beam tests.
Highlights
New types of profiled decking have been developed for modern steel–concrete composite construction to maximise slab efficiency and provide large unpropped spans of the composite slab
This can lead to problems for the design of the supporting composite beams to satisfy the minimum degree of shear connection
This paper presents the results of tests on ten short-span composite beams with modern profiled sheeting and low degrees of shear connection
Summary
New types of profiled decking have been developed for modern steel–concrete composite construction to maximise slab efficiency and provide large unpropped spans of the composite slab. The disadvantage is that, with modern deep or narrow deck ribs, the shear resistance of the headed studs is strongly reduced in comparison with cases with solid concrete slabs. This can lead to problems for the design of the supporting composite beams to satisfy the minimum degree of shear connection. The paper addresses the application of plastic design of the shear interface to composite beams with less than the required minimum degree of shear connection according to EN 1994-1-1 (DIN, 2010b) It addresses the accurate prediction of the shear resistance of headed studs in modern profiled sheeting
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More From: Proceedings of the Institution of Civil Engineers - Structures and Buildings
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