Determination of deflection in composite slabs considering concrete creep

Resumo

The analysis of the behavior and resistance of composite steel and concrete slabs covers several parameters. Among these parameters, concrete creep plays an important role in checking deflection. Regarding the calculation of the deflection, generally, technical standards recommend that the moment of inertia of the composite section be given by the simple average of the moments of inertia of the uncracked and cracked sections. However, experimental investigations have shown that this procedure, inadequately characterizes the behavior of the composite slab, resulting in an underestimated effective moment of inertia and smaller deflection, especially when subjected to higher loads. Using research results, this work aims to present a proposal for determining the effective moment of inertia in composite slabs that considers the concrete creep representing the behavior during the loading phase until collapse.