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In this paper, we study the progressive collapse of 3D framed structures madeof reinforced concrete after the sudden loss of a column. The structures arerepresented by elasto-plastic Euler Bernoulli beams with elongation-rotationfailure threshold. We performed simulations using the Discrete Element Methodconsidering inelastic collisions between the structural elements. The resultsshow what collapse initiation and impact-driven propagation mechanisms areactivated in structures with different geometric and mechanical features.Namely, we investigate the influence of the cross sectional size andreinforcement $\alpha$ and of the plastic capacity $\beta$ of the structuralelements. We also study the final collapse extent and the fragment sizedistribution and their relation to $\alpha$, $\beta$ and to the observedcollapse mechanisms. Finally, we compare the damage response of structures withsymmetric and asymmetric reinforcement in the beams.

Progressive Collapse Mechanisms of Brittle and Ductile Framed Structures