Parametric analysis on punching shear resistance of reinforced-concrete continuous slabs Beatrice Belletti Associate Professor, Department of Engineering and Architecture, University of Parma, Parma, Italy (Orcid:0000-0002-4382-9930) Aurelio Muttoni Professor, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland (Orcid:0000-0001-8418-5556) Simone Ravasini Civil Structural Engineer, Department of Engineering and Architecture, University of Parma, Parma, Italy (Orcid:0000-0002-6843-1646) Francesca Vecchi PhD Researcher, Department of Engineering and Architecture, University of Parma, Parma, Italy (corresponding author: [email protected]) (Orcid:0000-0002-3852-4243) Punching shear resistance formulations provided by codes are usually calibrated on test results of isolated specimens that typically simulate the slab zone within the points of contraflexure around the column (hogging area). However, the behaviour of actual continuous flat slabs can be different to that of isolated specimens owing to the beneficial contributions of moment redistributions and membrane actions that cannot take place in isolated specimens. This paper presents a parametric study carried out to highlight the influence of the main geometrical features and the reinforcement layout affecting the punching shear resistance of continuous slabs around internal columns. Notation a m distance between cracks b 0 length of the control perimeter c column size [D c ] Jacobian matrix in x, y-coordinate system of concrete [D s ] Jacobian matrix in x, y-coordinate system of steel d effective depth of the slab d g maximum aggregate size d g0 reference aggregate size E c modulus of elasticity of concrete E s modulus of elasticity of steel f c concrete compressive strength f t concrete axial tensile strength f y yield strength of the reinforcement steel G c compressive fracture energy of concrete h slab thickness i n n-layer of multi-layered element k sys coefficient for the performance of punching shear reinforcement systems L flat slab span m E average moment per unit length m R average flexural resistance of the slab in the hogging area r s distance between the column axis and the point of contraflexure S i bar spacing t finite-element shell thickness V acting shear force V E acting shear force V R punching shear resistance w ctu maximum crack opening with residual tensile strength x i ,y i direction of the ith order of bar γ xy shear strain in the x,y-coordinate system ε concrete strain ε c,cr concrete strain at maximum compressive stress ε c,el elastic compressive strain of concrete ε c,pl plastic compressive strain of concrete ε c,re experienced minimum compressive strain on the monotonic curve ε c,u ultimate strain of concrete in compression ε cr cracking of concrete ε sh shrinkage strain ε sy yielding strain of reinforcement ε t,cr concrete strain at maximum tensile stress ε t,el elastic tensile strain of concrete ε t,pl plastic tensile strain of concrete ε t,re experienced minimum tensile strain on the monotonic curve ε t,u ultimate tensile strain of concrete ε x,y strain along x,y direction, respectively (Figure 2(a)) {ε c } strain vector of concrete {ε cf } concrete strain field caused by applied loads {ε m } total strain vector of reinforced-concrete element {ε s } strain vector of steel {ε sf } steel strain field caused by applied loads {ε sh } shrinkage strain ρ hogg percentage of hogging reinforcement ρ sagg percentage of sagging reinforcement σ total stress field of reinforced-concrete member σ c stress field of concrete σ cl,cr residual bond stress σ s stress field of steel 1 Cite this article Belletti B, Muttoni A, Ravasini S and Vecchi F Parametric analysis on punching shear resistance of reinforced-concrete continuous slabs. Magazine of Concrete Research, https://doi.org/10.1680/jmacr.18.00123 Magazine of Concrete Research Research Article Paper 1800123 Received 12/03/2018; Revised 12/06/2018; Accepted 12/07/2018 ICE Publishing: All rights reserved Keywords: punching/slabs & plates/ structural analysis Downloaded by [ EPFL Bibliotheque - 19 GBP] on [02/10/18]. Copyright © ICE Publishing, all rights reserved. brought to you by CORE View metadata, citation and similar papers at core.ac.uk provided by Infoscience - École polytechnique fédérale de Lausanne
Parametric analysis on punching shear resistance of reinforced-concrete continuous slabs
May 20, 2023
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