Communication Dans Un Congrès Année : 2019

Influence of dowel effect for the simulation of reinforced concrete structures

Luc Davenne
Can Turgut
  • Fonction : Auteur

Résumé

Dowel effect is one of the phenomena, with the aggregate interlock, which is responsible for the increase in the shear resistance of reinforced concrete structures subjected to cracking. It is associated with the behavior of steel reinforcements crossed by a crack and its interaction with the surrounding concrete. Even if this effect is largely used in literature to explain the differences between experiments and simulations, its real consequences on the structural behavior is not so clear, with contradictory conclusions in previous published studies. The objective of this contribution is to evaluate if particular numerical tools needs to be taken into account to correctly capture the behavior of reinforced concrete structures subjected to shear concrete cracks. Two different tests cases are simulated to highlight the dowel effect at two different scales: the laboratory local scale with the simulation of a classical “dowel” test, which aims at quantifying the dowel effect through a shear force – shear displacement curve, and a structural scale with a continuous deep beam. From the analysis of the simulations using damage mechanics, it is shown that: • at the local scale, dowel effect is obviously predominant (as the test is designed to describe this effect) and the usual simulation tools may not be sufficient to correctly capture the local behaviors. In particular, simulations using 3D, 1D truss and 1D beam elements for steel in 3D concrete are compared. It is shown that the necessary fine mesh density and the very local behavior around the reinforcement bar prevent from using simplified “engineering” hypothesis (truss or beam elements for reinforcements) without further improvements. The influence of the concrete constitutive law is also underlined. • at the structural scale, contrary to the laboratory one, it seems possible to correctly capture the mechanical behavior with classical simulation tools. A parametric study is proposed to prioritize the main influent parameters (boundary conditions, mesh, constitutive law, type of finite elements for steel…). From this parametric study, an adapted methodology is finally suggested to correctly simulate the main characteristics of the structural behavior, even in cases of main cracks in concrete.

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Dates et versions

hal-02946803 , version 1 (23-09-2020)

Identifiants

  • HAL Id : hal-02946803 , version 1

Citer

Ludovic Jason, Luc Davenne, Can Turgut. Influence of dowel effect for the simulation of reinforced concrete structures. 4th International Conference on Building Materials and Construction (ICBMC 2019), Feb 2019, Singapore, Singapore. ⟨hal-02946803⟩
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