Thermo-mechanical analysis of composite slabs under fire conditions

The paper studies the behavior of composite slabs with corrugated steel sheeting in elevated temperatures. Two structural systems are considered: a simply supported composite slab and a continuous composite slab that consists of two equal spans. Both of them are designed according to the respective Eurocodes for strength and fire resistance. In the sequel sophisticated three- dimensional models of the slabs are developed and they are submitted to coupled-thermomechanical analysis, which takes into account the various nonlinearities that are present in the physical model (dependence of the thermal and mechanical properties of the material on temperature, nonlinear material behavior, cracking etc). The results are compared with those expected by the procedures of Eurocode 4.