Abstract
This contribution aims to analyze the deterioration behaviour of steel fibre-reinforced high-performance concrete (HPC) in both experiments as well as numerical simulations. For this purpose, flexural tensile tests are carried out on beams with different fibre contents and suitable damage indicators are established to describe and calibrate the damage behaviour numerically using a phase-field model approach. In addition to conventional measurement methods, the tests are equipped with acoustic emission sensors in order to obtain a more precise picture of crack evolution by observing acoustic events. It is shown that, in addition to classical damage indicators, such as stiffness degradation and absorbed energy, various acoustic indicators, such as the acoustic energy of individual crack events, can also provide information about the damage progress. For the efficient numerical analysis of the overall material behaviour of fibre-reinforced HPC, a phenomenological material model is developed. The data obtained in the experiments are used to calibrate and validate the numerical model for the simulation of three-point bending beam tests. To verify the efficiency of the presented numerical model, the numerical results are compared with the experimental data, e.g., load-CMOD curves and the degradation of residual stiffness.
Highlights
Published: 3 February 2022Steel fibre-reinforced concrete (SFRC), high-performance concrete (HPC) with steel fibres, as well as ultra-high-performance concrete (UHPC) with fibres have been objects of research worldwide and have been widely applied throughout the last decades [1,2].The advantages of steel fibres as reinforcement in concrete include increasing the loadbearing capacity of cracked concrete, reducing crack width to increase durability, and increasing energy absorption capacity and ductility under cyclic loading
This paper describes specific, low-cycle, flexural tests on steel fibre-reinforced concrete with three different amounts of steel fibres, the development of various damage indicators including acoustic emission, and a numerical phase-field approach to fracture
In this contribution a combined experimental–numerical approach is outlined aiming at the assessment of the high-cycle performance of steel fibre-reinforced HPC and UHPC
Summary
Published: 3 February 2022Steel fibre-reinforced concrete (SFRC), high-performance concrete (HPC) with steel fibres, as well as ultra-high-performance concrete (UHPC) with fibres have been objects of research worldwide and have been widely applied throughout the last decades [1,2].The advantages of steel fibres as reinforcement in concrete include increasing the loadbearing capacity of cracked concrete, reducing crack width to increase durability, and increasing energy absorption capacity and ductility under cyclic loading. Steel fibre-reinforced concrete has been applied in several areas. A state-of-the-art report for using steel fibres in precast tunnel segments has been published [6]. Another application of SFRC are joints in reinforced beam–column structures, which may be subjected to earthquakes [7,8,9,10]. In this case, steel fibres are added to improve the energy dissipation of the joints
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