Modelling and Analysis of Reinforced Concrete Beams

Sucharda, Oldřích; Kubosek, Jan

doi:10.4028/www.scientific.net/kem.662.81

Cited by 2 publications

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“…In summary, this leads to the use of nonlinear analysis especially in the case, where the total bearing capacity is being measured. For numerical analysis, it is then possible to use the finite element method in combination with nonlinear analysis [14][15][16], which is currently the most used method. The finite element method [17] principle is based on the discretization of the computational model in a number of areas, where for the task at hand it is choosing an appropriate size of the modelled subsoil and input parameters for materials.…”

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Numerical Analysis of Reinforced Concrete Slab with Subsoil

Kozielova

Marcalíková

Matečková

et al. 2020

Civil and Environmental Engineering

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AbstractThe article deals with the interaction of a reinforced concrete slab with subsoil. The paper contains a non-linear analysis based on an experiment of reinforced concrete slabs with dimensions 2000 x 2000 mm and thickness 150 mm. A steel mesh with a diameter of 8/100 mm was used as reinforcement. The calculations and analysis are complemented by a comparison with EC2 design approaches. The research area combines the design of concrete structure and geotechnical tasks. The real behavior of the concrete structure with subsoil is considered for the analysis for advanced design. The selected computational approach of nonlinear analysis allows to capture the change of stiffness after the creation of cracks and modelling the shear punch failure of the slab - the collapse of the structure. The paper focuses on comparing the experiment with the numerical model in select loaded states for various input parameters of subsoil. Based on the experiment and numerical analysis the failure mechanism was determined. It was the punching of the slab. The calculations and the experiment verified that the critically controlled perimeter is at a distance of 1d. The effect of the modulus of elasticity on the slab punch mechanism was verified. In case of low modulus of subsoil, the load-bearing capacity of the slab is significantly reduced. The punching mechanism is influenced not only by the mechanical properties of the concrete but also by the properties of the subsoil. The performed parametric study also verified the influence of the size the nominal cover reinforcement depending on the modulus of elasticity of the subsoil. The deformation variant finite element method and a 3D computational model were used for numerical modelling. Nonlinear analysis was based on the Newton-Rapson method.

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confidence: 99%