During an extreme event occurring on a reinforced concrete structure, characterized by the loss of a load-bearing element, the remaining resisting members may develop alternate load paths to resist gravity loads. However, it is recognized that reinforced concrete flat slabs are prone to punching shear failure. This issue is particularly relevant for existing reinforced concrete structures where creep, shrinkage, and corrosion effects due to environmental conditions play a fundamental role before the occurrence of the extreme event. In this paper, nonlinear pushdown and dynamic analyses were performed on an existing continuous reinforced concrete flat slab to investigate the structural response in the case of an interior column loss. Firstly, the flexural and membrane action resisting contributions were in-deeply analyzed. Secondly, the crucial effects of creep, shrinkage and corrosion on the dynamic response and punching shear resistance of the system were critically evaluated. Finally, useful insights for the structural robustness assessment of existing RC structures subjected to material deterioration were provided.
LONG-TERM AND CORROSION EFFECTS ON THE PUNCHING SHEAR RESISTANCE OF RC FLAT SLABS SUBJECTED TO SUDDEN COLUMN LOSS / Ravasini, S.; Calcavecchia, B.; Belletti, B.; Bonati, N.. - ELETTRONICO. - SP-357:(2023), pp. 77-99. (Intervento presentato al convegno Punching Shear of Concrete Slabs: Insights from New Materials, Tests, and Analysis Methods at the ACI Spring Convention 2023 tenutosi a usa nel 2023).
LONG-TERM AND CORROSION EFFECTS ON THE PUNCHING SHEAR RESISTANCE OF RC FLAT SLABS SUBJECTED TO SUDDEN COLUMN LOSS
Ravasini S.;Calcavecchia B.;Belletti B.;
2023-01-01
Abstract
During an extreme event occurring on a reinforced concrete structure, characterized by the loss of a load-bearing element, the remaining resisting members may develop alternate load paths to resist gravity loads. However, it is recognized that reinforced concrete flat slabs are prone to punching shear failure. This issue is particularly relevant for existing reinforced concrete structures where creep, shrinkage, and corrosion effects due to environmental conditions play a fundamental role before the occurrence of the extreme event. In this paper, nonlinear pushdown and dynamic analyses were performed on an existing continuous reinforced concrete flat slab to investigate the structural response in the case of an interior column loss. Firstly, the flexural and membrane action resisting contributions were in-deeply analyzed. Secondly, the crucial effects of creep, shrinkage and corrosion on the dynamic response and punching shear resistance of the system were critically evaluated. Finally, useful insights for the structural robustness assessment of existing RC structures subjected to material deterioration were provided.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
