Title: Dynamic Punching Assessment of Edge Columns after Sudden Corner Column Removal
Author(s): Julio Garzón-Roca, Juan Sagaseta, Manuel Buitrago, and José M. Adam
Publication: Structural Journal
Appears on pages(s): 299-311
Keywords: alternative load path; column removal; dynamic punching shear; flat slab; progressive collapse; structural integrity
A dynamic punching shear model is presented for general sudden column removal cases which was validated against data from a purpose-built full-scale two-story reinforced concrete building subjected to a sudden corner column removal. Such analyses are generally performed in structural robustness or integrity design against progressive collapse, and several simplifications are generally adopted to avoid complex dynamic non-linear analyses. These simplifications are generally on the conservative side and punching can be predicted incorrectly. The test results presented showed that Vierendeel action at small deformations was predominant after column removal. The dynamic amplification of the deformations and shear was significant, although punching did not occur as predicted by the model. It was found that in general cases, punching around edge columns after sudden corner column removal was not critical using design accidental load combinations, although a dynamic punching check is still needed, especially for higher live loads and low flexural and punching reinforcement ratios.