Simulation of fibre reinforced concrete structural failure based on bending test results
2021
Skadins, U., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia) | Bokta, M., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia)
Composite materials like steel fibre reinforced concrete (SFRC) gain attention among engineers and designers. It is possible by adding fibres to increase ductility of such brittle materials as concrete. However, such materials are difficult to design, because the mechanical properties of SFRC are hard to predict. Nonlinear computer modelling based on the Finite Element Analysis (FEA) can be utilised to predict failure of a composite structure, if the material properties are defined correctly. A material model describing the tension and compression properties of the composite must be determined. In practice uniaxial tension tests in case of SFRC are difficult to perform, therefore the properties of the material are represented by standard laboratory bending tests. These results cannot be used directly in nonlinear FEA simulation software. The aim of the study is to find the link between the results of standard bending tests and the material model in tension that could be used in simulation software. In the study ATENA GiD software is used for simulation purposes. The simulation is performed in conjunction with experimental results of 24 SFRC beams, tested according to the standard EN 14651. The material model of SFRC is obtained by an improved inverse analysis based on the bending test results. Parametric analysis of the SFRC material model is performed. As a result, a numerical method for converting the bending test results to the material model in tension is suggested. The evaluation of the proposed model shows ± 2.5% error at 3.5 mm of crack mouth opening distance in average, if the predicted and the actual fracture energy is compared.
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