Computational Assessment of the Progressive Collapse of a Five Storey Structure Considering Two Different Building Codes

Abstract eng:
The analysis and understanding of the progressive collapse of buildings plays significant role on the search for structural safety. The present work proposes the association of a corotational formulation, plasticity and a sectional degradation model for the analysis of reinforced concrete (RC) buildings designed in accordance to fib [1] and Eurocode [2] and also the Brazilian building code (ABNT - NBR 6118) [3]. The model makes use of a layered Euler/Bernoulli-based beam formulation and takes into account both nonlinear and dynamic aspects. The corotational formulation used for including geometrical nonlinearities is similar to the one proposed in [4]. The material nonlinearity is based on a one-dimensional elastoviscoplastic model. A sudden column loss approach is considered, turning the formulation into a general one for dynamic analysis of planar RC frames. Also, by discretizing the transversal section into layers, it is possible to tackle the problem in a multiscale approach [5]. The chosen structures intentionally assume the minimum requirements for the design of multi-storey edifices that are proposed by fib [1] – Eurocode [2] and ABNT - NBR 6118 [3], being used to verify if these requirements are sufficient for enforcing structural safety and also to verify the major differences between those two building criteria concerning progressive collapse.

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