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A post-punching shear model for column-slab connections for progressive collapse analyses

Ulaeto, Nsikak W. and Sagaseta, Juan (2020) A post-punching shear model for column-slab connections for progressive collapse analyses Magazine of Concrete Research.

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Abstract

Progressive collapse of concrete flat slab structures is mainly governed by the structural response of the slab-column connections before and after local failure of the connections. A novel model is proposed to predict the structural response of column-slab connections after punching shear failure (post-punching shear). The proposed model considers the gradual activation and deactivation of flexural bars within and outside the punching shear cone as well as the contribution of integrity reinforcement. The model is formulated in terms of slab vertical displacements so that it can be applied to progressive collapse analyses including asymmetric cases such as in column removal scenarios commonly adopted in structural robustness design. The proposed model is validated using existing experimental data covering symmetric post-punching tests without shear reinforcement, with and without integrity reinforcement. Numerical modelling was also applied to verify the analytical model by means of 3D explicit finite element modelling. Analytical and numerical models showed that asymmetric post-punching lead to a reduction of the peak post-punching strength due to an early fracture of the reinforcement whereas the residual shear strength in the connection immediately after punching can be higher in asymmetric cases.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Civil and Environmental Engineering
Authors :
NameEmailORCID
Ulaeto, Nsikak W.n.ulaeto@surrey.ac.uk
Sagaseta, JuanJ.Sagaseta@surrey.ac.uk
Date : 2020
Funders : Commonwealth Scholarship Commission in the UK
Copyright Disclaimer : Copyright © 2020 ICE Publishing, all rights reserved.
Uncontrolled Keywords : Punching; Slabs & plates; Failure
Related URLs :
Depositing User : Clive Harris
Date Deposited : 03 Jun 2020 21:42
Last Modified : 03 Jun 2020 21:42
URI: http://epubs.surrey.ac.uk/id/eprint/857063

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