Original Article Latin American Journal of Solids and Structures, 2018, 15(10), e120 Aspects of Finite Element Modeling of Punching Shear Behavior of Reinforced Concrete Flat Slabs Abstract A series of nonlinear FE analyses was conducted in this paper to model the punching shear failure of RC flat slabs. The analyses were carried out in the soft- ware DIANA using three-dimensional continuum elements. These analyses in- volve the test of different modeling choices in order to evaluate their influences on punching shear failure modeling. The parameters examined are the size of the FE mesh, the convergence methods and the concrete material input parameters. These parameters were investigated by comparing the results of load carrying capacity, load-deflection response and crack patterns from the FE analyses with a reliable experimental test. From the results obtained, it could be concluded that the numerical model was able to reproduce accurately the behavior of the tested slab and capture the punching shear failure. Keywords Punching Shear; Flat Slabs; Numerical Modeling; Reinforced Concrete. 1 INTRODUCTION Punching shear failure is a complex phenomenon that occurs in reinforced concrete flat slab as a consequence of the stress concentration on slab-column region. A large number of experimental tests and analytical studies have been con- ducted on the last decades in order to determine the parameters that influence the punching shear behavior. Also, several models have been proposed, e.g. Kinnunen and Nylander (1960), Moe (1961), Nielsen and Braestrup (1976), Shehata (1990), Menétrey (1995) and more recently the Critical Shear Crack Theory (CSCT) proposed by Muttoni (2008). How- ever, there is a still discussion about which one is the most accurately approach for the design of flat slabs. Besides, most of the design codes recommendation related to punching shear are based on empirical methods, e.g. Eurocode 2 (2004), ACI 318-14 (American Concrete Institute, 2014), and provided different methods that may differ significantly. On the other hand, with the development of computational facilities, nonlinear finite element analysis (NLFEA) have become an interesting alternative for the assessment of concrete structures. These analyses may account nonlinear behav- iors as concrete cracking and reinforcement yielding. Also, numerical parameter studies can be conducted to study the sensibility of each variable. In the case of modeling RC-flat slab, different investigations have been conducted. Early numerical studies implemented two-dimensional (2D) models using axisymmetric elements, e.g. Hallgreen (1996) and Menétrey (1995) for modeling circular slabs with ring reinforcement. However, this same approach was not suitable for slabs with orthogonal reinforcement. For that reason, tridimensional elements were adopted by other authors in order to represent in a more realistic way the punching shear behavior, e.g. Mamede et al. (2012), Belletti et al. (2015) and Shu et al. (2016). Those mentioned works have in common the use of the Smeared Crack approach for take into account the concrete cracking. The mean feature of this model is that the cracked concrete is assumed to remain as continuum material and the mechanical properties are modified to account for the effect of cracking, according to the evolving states of strain and stress (Cervera and Chiumenti, 2006). Despite of all the numerical investigations, modeling shear failure modes in slabs elements is still a challenging task using NLFEA models, mainly because of the lack of a general methodology and the quantity of input parameters. Few Rafael A. Sanabria D. a* Leonardo H. B. de Oliveira a,b* Leandro Mouta Trautwein a Luiz Carlos de Almeida a Antônio Carlos dos Santos c a Faculdade de Engenharia Civil, Arquitetura e Urbanismo, Universidade Estadual de Campinas - UNICAMP, Campinas, São Paulo, Brazil. E-mail: [email protected], [email protected], [email protected], [email protected] b Universidade Federal Rural do Semi-Árido – UFERSA, Pau dos Ferros, Rio Grande do Norte, Brazil. c Faculdade de Engenharia Civil, Universidade Federal de Uberlândia – UFU, Uberlândia, Minas Gerais, Brazil. E-mail: [email protected] *Corresponding authors http://dx.doi.org/10.1590/1679-78255004 Received: March 23, 2018 In Revised Form: July 17, 2018 Accepted: August 20, 2018 Available online: August 21, 2018
Aspects of Finite Element Modeling of Punching Shear Behavior of Reinforced Concrete Flat Slabs
May 20, 2023
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