Nonlinear static analysis of flat slab floors with a grid model

A grid model has been set up for the non-linear response of a flat slab subjected to gravity and lateral cyclic loading. The model requires the definition of the grid geometry and properties of point hinges in beam finite elements, modelling the nonlinear response in bending, torsion and shear. The simulation is carried out for experimental tests on a floor, under gravity and lateral biaxial cyclic loading of increasing amplitude. Pushover analyses have been performed under gravity and horizontal loads in the two principal directions. The predictions are shown of the global response and the connections with different column shape and slab reinforcement, with the strength, drift capacity and failure modes. The accuracy is different in the two directions of loading, due to the damage of the test slab for biaxial cyclic loading. The results show the potential of the model for design and analysis of existing flat slab structures.