MODELING FRACTURE OF REINFORCED CONCRETE STRUCTURES UNDER IMPACT

Andrey Radchenko, Pavel Radchenko, Stanislav Batuev, Vasiliy Plevkov

Abstract


Introduction: The papers presents results of an integrated experimental and numerical study on behavior of reinforced-concrete beams under impulse loading. The beams under study had three layers. The upper and lower layers were of fiber-reinforced concrete with a carbon fiber volume fraction of 0.2%. The middle layer was of concrete with metal reinforcement. Methods: Experimental studies were performed using a pile driver. A falling weight of 450 kg was dropped on a beam from a height of 0.7 m. The authors performed numerical studies based on the finite element method in a full dynamic 3D setting, using the proprietary EFES software suite considering structure fragmentation, formation of contact and free surfaces. Results: In numerical modeling, the reinforcement mesh was clearly defined. The authors studied changes over time in the stress-strain state, and fracture of reinforced-concrete beams under short-term impact loading. They developed a calculation algorithm and procedure that made it possible to analyze and predict behavior of actual structures in a full dynamic 3D setting. They also proposed a model of concrete and fiber-reinforced concrete behavior, considering anisotropy, bimodularity with regard to strength characteristics, plastic properties, and relations between strength and strain rate / pressure. Fracture dynamics in concrete beams reinforced with metal bars was studied. Good agreement of the results with the experimental data was observed.


Keywords


model, fracture, strain, stress, concrete, fiber-reinforced concrete

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References


Anderson, C.E., Cox, P.A., Johnson, G.R., Maudlin, P.J. (1994). A Constitutive Formulation for Anisotropic Materials Suitable for Wave Propagation Computer program-II. Computational Mechanics, 15, pp. 201–223.

Belov, N.N., Kabanzev, O.V., Kopanitsa, D.G., Yugov, N.T. (2008). Calculative-experimental method to analyze dynamic strength of the construction elements made of reinforced concrete. Tomsk: STT, 292 p.

Buzyurkin, A.E., Kraus, E.I., Gladky, I.L. (2015). Determination and verification of Johnson-Cook model parameters at high-speed deformation of titanium alloys. Aerospace science and technology, 45, pp. 121–127. DOI: 10.1016/j.ast.2015.05.001.

International Atomic Energy Agency (2018). Safety Aspects of Nuclear Power Plants in Human Induced External Events: Assessment of Structures, Safety Reports Series, 87. Vienna: IAEA, 204 p.

Johnson, G.R. (1977). High velocity impact calculations in three dimension. Journal of Applied Mechanics, 44 (1), pp. 95–100.

Johnson, G.R. (1977). Three-dimensional analysis of sliding surface during high velocity impact. Journal of Applied Mechanics, 44 (6), pp. 771–773.

Hoffman, O. (1967) The brittle strength of orthotropic materials. Journal of Composite Materials, 1, pp. 200–206.

Radchenko, P.A., Batuev, S.P., Radchenko, A.V. (2014). 3D modeling of deformation and fracture in heterogeneous materials and structures under dynamic loading (EFES 1.0). Federal Service for Intellectual Property, Patents and Trademarks. Certificate of computer program state registration No. 2014614671. Registered in the Register of Computer Programs on May 6, 2014.

Rachenko, A.V., Radchenko, P.A. (2015). Shock wave processes and fracture in anisotropic materials and structures. Tomsk: Tomsk State University of Architecture and Building, 204 p.

Radchenko, P.A., Batuev, S.P., Radchenko, A.V., Plevkov, V.S. (2015). Numerical simulation of deformation and fracture of space protective shell structures from concrete and fiber concrete under pulse loading. Omsk Scientific Bulletin, 3, pp. 345–348.

Sedov, L.I. (1973). Continuum mechanics. Vol. 1. Moscow: Nauka, 536 p.

Tsai, S.W., Wu, E.M. (1971). A General Theory of Strength for Anisotropic Materials. Journal of Composite Materials, 5, pp. 58–80.




DOI: https://doi.org/10.23968/2500-0055-2019-4-3-22-29

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ISSN: 2500-0055