Effects of partial shear connection in semi-continuous composite beams

This paper considers the effect of the use of partial shear connection (using the concepts of partial interaction) on the behaviour of semi-continuous composite beam systems. Partial shear connection can be considered to occur in two distinctly different regions in a semi-continuous composite beam, these being characterised by sagging and hogging bending zones. Generally the effects of partial interaction which is increased by the use of partial shear connection will result in a lower strength, reduced stiffness and possibly enhanced ductility of a semi-continuous composite beam system. It is the enhanced ductility of the system which may be considered to alter the demands on the required rotations at the joints, resulting from the reduced curvatures within the span. Furthermore, the use of partial interaction within the hogging regions potentially increases the available rotation capacities of the joint regions. A parametric study is conducted on composite beams with slabs spanning between secondary beams, supported by primary beams. Sample results and further research in order to properly validate the approach is also highlighted.