The progressive collapse resistance of a medium‐rise multistory reinforced concrete flat slab structure is evaluated numerically using the applied element method. The case study is designed according to ACI 318 and its progressive collapse is assessed in accordance with the Unified Facilities Criteria (UFC) guidelines. The numerical results show that the case study considered generally satisfies the limits of the UFC guidelines except for the case of near‐corner interior column loss at the 10th floor and edge shear wall loss at ground, 5th, 8th, and 10th floors. The removal of the edge shear walls on the higher floors caused a partial collapse.

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Exterior columns are highly susceptible to structural damage in cases of blast attacks, and its failure may lead to a progressive collapse of the entire structure. In this study, a three-dimensional nonlinear dynamic analysis was carried out on a 10-Storey reinforced concrete office building. The building was designed according to ACI 318, then its exterior columns were subjected to blast loading threat. The computational program used is Extreme Loading for Structures software, which is based on the applied element method (AEM).The AEM can estimate the structural behavior from the elastic stage through cracking, large displacement, complete elements separation, and eventually collapse. In this study, an exterior column is analyzed under different weights of (TNT) detonation charges concerning different standoff distances, the behavior of the columns is evaluated according to UFC 3-340-02 and PDC-TR 06-08. Analysis trials are carried out to estimate a safe and economical column design that can withstand a predefined charge weight and standoff distance.