Discussion: FE analysis of shear-loaded hollow-core slabs on different supports

摘要

In beams supporting hollow-core units on their bottom flange, the initial situation of composite interaction is based on the concrete bond in the grout between the ends of the decking units and the bond perimeter of the beam section. Also the friction on the bearing layer of the bottom flange will take part in picking the connection shears, but the interaction cannot be explained by the friction alone. The system of connections between the decking and the beams is variable in the course of loading and the initial situation of the flexural member may be analysed by employing the general flexural theory of composite members considering full interaction and rigid connections. However, this is valid only to a load level which causes vertical cracks in the grout interface, starting from the supports of the beam and extending towards the section of maximum bending. Above this level, redistribution of longitudinal shear forces will take place and for transferring the compressive force activated by the interaction in the upper hull of the decking units, the webs have to act as 'shear connectors'.