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Punching shear failure in blast-loaded RC slabs and panels

Sagaseta, Juan, Olmati, P, Micallef, K and Cormie, D (2017) Punching shear failure in blast-loaded RC slabs and panels Engineering Structures, 147. pp. 177-194.

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Abstract

Reinforced concrete (RC) slabs and panels are commonly encountered in critical infrastructure and industrial facilities with a high risk of close-range explosions due to accidents or terrorist attacks. Close-in detonations lead to high intensity concentrated loads which can cause a premature brittle punching failure of the member. The assessment of such type of failure mode is challenging since the loading source varies its magnitude in space and time. This paper proposes an analytical method by which the occurrence of punching (or otherwise) is assessed by comparing the dynamic shear demand and capacity (supply). An exponentially decaying distribution of reflected overpressures on the RC surface is presented for this analysis. The punching shear demand is estimated from the pressure and inertial forces acting in the free body diagram. The dynamic punching shear capacity is obtained using the Critical Shear Crack Theory with small slab deformations which are predicted from an equivalent single-degree-of freedom model. The proposed approach takes into account the impulsive behaviour of the member leading to a higher punching capacity and provides better predictions than using existing formulae for punching which are based on tests with quasi-static loading and deformations. The proposed analytical equations are further supported by numerical explicit finite element models providing useful information of crack development, dynamic reactions and deflections. The application of the proposed method has been illustrated and validated by comparison with various tests with scale distances from 0.2 to 1.5m/kg1/3. A practical example is presented to illustrate the applicability of the proposed method.

Item Type: Article
Subjects : Civil & Environmental Engineering
Divisions : Faculty of Engineering and Physical Sciences > Civil and Environmental Engineering
Authors :
NameEmailORCID
Sagaseta, JuanJ.Sagaseta@surrey.ac.ukUNSPECIFIED
Olmati, PUNSPECIFIEDUNSPECIFIED
Micallef, KUNSPECIFIEDUNSPECIFIED
Cormie, DUNSPECIFIEDUNSPECIFIED
Date : 7 June 2017
Identification Number : 10.1016/j.engstruct.2017.04.051
Copyright Disclaimer : Copyright 2017 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
Uncontrolled Keywords : Punching shear; blast loading; strain-rate effects; critical shear crack theory; numerical, simulations.
Related URLs :
Depositing User : Symplectic Elements
Date Deposited : 05 May 2017 08:46
Last Modified : 25 Jul 2017 14:21
URI: http://epubs.surrey.ac.uk/id/eprint/814111

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