Coupled Experimental and Computational Investigation of the Interplay between Discrete and Continuous Reinforcement in Ultrahigh Performance Concrete Beams. II: Mesoscale Modeling

Bhaduri, Tathagata; Gomaa, Shady; Alnaggar, Mohammed

doi:10.1061/(asce)em.1943-7889.0001941

Cited by 11 publications

(1 citation statement)

References 54 publications

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“…Instead of modeling the three‐dimensional (3D) ribbed shape of reinforcement in lattice modeling, some researchers attempted to simplify the procedure and treated the reinforcement as a one‐dimensional beam or truss elements (Aydin et al., 2019; Bhaduri et al., 2021; Mustafa et al., 2022). In a discrete rigid body spring model (RBSM), the reinforcement beam elements are connected to concrete particles through zero‐length linkage spring elements, for which the constitutive law can be defined by the local bond stress‐slip relationship between reinforcement and concrete (Bolander et al., 2000; Gedik et al., 2011; Yip et al., 2005).…”

Section: Introductionmentioning

confidence: 99%

Reinforcement‐concrete bond in discrete modeling of structural concrete

Mustafa

Pan

et al. 2022

Computer aided Civil Eng

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The bond between concrete and reinforcement is one of the critical parameters influencing the structural behavior of reinforced concrete (RC). This research proposes a mathematical methodology to scale the reinforcement-concrete bondslip relationship in a beam lattice modeling framework. A simplified, generalized approach based on stochastic analysis is proposed to model the interaction between the reinforcing bar and surrounding concrete at the macroscale. The approach considers the randomness of the lattice mesh and the mesh size and adopts an analytical model for the interface assuming the pull-out failure of reinforcement as input, thereby including also the mesoscale geometric effect of ribs. By using the geometric configuration of Delaunay triangulation in the random lattice mesh, the interface elements can reproduce the basic conical stress transfer mechanism in concrete. Consequently, depending on boundary conditions, and without changing the interface properties, a splitting failure and bond-slip relation for splitting failure can be predicted. The model is systematically validated in different types of pull-out tests, through flexural and finally shear tests. With limited input (properties of the concrete and analytical equation for pullout failure), having a (strong) physical background, the model was shown to capture the fundamental fracture mechanisms in RC under different loading and confinement conditions.

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