What is it about?
This study investigates how synthetic fibres influence the cracking behaviour of concrete. When fibres are mixed into concrete, they do not significantly increase the initial strength, but they help the material carry load after cracks form by bridging and holding the crack surfaces together. The paper analyses this behaviour through beam tests and proposes a simple material model based on fracture energy, which describes how fibres increase the energy needed for cracks to grow. This approach helps better represent the real behaviour of fibre-reinforced concrete in engineering calculations.
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Why is it important?
Understanding how fibres influence the fracture energy of concrete is essential for modelling the behaviour of fibre-reinforced concrete after cracking. Traditional approaches often focus only on strength, while the real structural performance is governed by the relationship between stress and crack opening. By modelling fibre reinforcement through fracture energy, more accurate results can be achieved because the approach directly uses the stress–crack width relationship. The proposed model is also elegantly simple, numerically stable, and easy to implement in finite element analysis. This makes it particularly practical for engineering applications, and it has already been successfully implemented in FE software such as ATENA.
Perspectives
Future development of the model could incorporate additional parameters describing the fibre distribution and fibre orientation within the concrete, allowing an even more realistic representation of the post-cracking behaviour of fibre-reinforced concrete. Extending the formulation in this direction would improve the predictive capability of the model for both synthetic and steel fibre reinforced concretes. Another important advantage is that the model can be calibrated using results from standardised bending beam tests, which are widely available in practice. This makes it possible to apply the approach without complex additional experiments, facilitating its broader use in engineering design and numerical modelling of fibre-reinforced concrete structures.
Dr Karoly Peter Juhasz
JKP Static Ltd
Read the Original
This page is a summary of: The effect of the synthetic fibre reinforcement on the fracture energy of the concrete, IOP Conference Series Materials Science and Engineering, October 2019, Institute of Physics Publishing,
DOI: 10.1088/1757-899x/613/1/012037.
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