Simplified reliability analysis of punching in reinforced concrete flat slab buildings under accidental actions

Simplified reliability analysis of punching in reinforced concrete flat slab buildings under accidental actions

P. Olmati (a), J. Sagaseta (b), D. Cormie (c), A.E.K. Jones (c)
a University of Surrey, UK2 - Currently at Tokyo Polytechnic University (JSPS fellow)
b Department of Civil and Environmental Engineering, University of Surrey, Guildford, UK
c Arup, London, UK

Olmati P, Sagaseta J, Cormie D, Jones AEK, Simplified reliability analysis of punching in reinforced concrete flat slab buildings under accidental actions, Engineering Structures, Vol. 130, pp. 83-98, 2017.

Abstract

Flat slab concrete buildings are widely found in infrastructure such as office and residential buildings or industrial facilities. The susceptibility of progressive collapse of such structures due to accidental loads is highly dependent on the structural performance of the slab-column connections. This paper presents a framework for a simplified reliability analysis and derivation of safety factors for computing the probability of punching of flat slab concrete buildings subjected to accidental loads such as column removal, slab falling from above or blast load. The main advantage of the proposed approach is that it considers in a simple manner, the uncertainty in the gravity load applied in the slab before the accidental event, which affects the inertial effects and demand/capacity ratio in the slab-column connections. Eurocode 2 and the Critical Shear Crack Theory for punching are used and extended to dynamic cases for the assessment of the demand/capacity ratio using computer-based time history finite element simulations. The proposed reliability method is applied to a case study of an existing building showing that the column removal situation is not always critical whereas the slab falling from above is much more detrimental.

Keywords: Punching, Flat slabs, Reliability analysis, Progressive collapse, Dynamic amplification factor, Finite element analysis, Column failure, Floor impact, Explosion load

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