Deformation capacity evaluation for flat slab seismic design

Abstract In flat-slab frames, which are typically designed as secondary seismic structures, the shear failure of slab around column (punching failure) is governing mode limits deformation capacity and can potentially lead to a progressive collapse structure. Existing rules predict flat frames resist imposed lateral displacements without losing capability bear gravity loads have been derived empirically from results cyclic tests on thin members. These account explicitly only for ratio between acting resistance against concentric punching (so-called Gravity Shear Ratio). Recent rational models estimate slabs show that other parameters play major role significant size effect (reduced thick slabs). this paper, closed-form expression internal slab-column connections function main same model has used develop formulae second generation Eurocode 2 concrete structures. This compared an existing database isolated showing fine accuracy allowing resolve shortcomings rules. addition, testing programme full-scale frame with two stories 12 columns described. The differences measured interstorey drifts local rotations influencing their forces presented discussed. With respect observed capacities, similar values obtained in specimens predictions confirmed columns, but internal, edge corner connections. effects reinforcement integrity (required according prevent after punching) also