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![12 Tension softening and tension-hardening behaviour of SFRC in tension [Adapted from Lok and Pei 1998]](profile/Nima-Aghniaey/publication/294090528/figure/fig8/AS:668923695489031@1536495245476/Tension-softening-and-tension-hardening-behaviour-of-SFRC-in-tension-Adapted-from-Lok.png)
12 Tension softening and tension-hardening behaviour of SFRC in tension [Adapted from Lok and Pei 1998]
Source publication
Concrete is a very weak and brittle material in tension. It has been shown in previous researches that the addition of steel fibers to a concrete matrix can improve this behavior. The ability of fibers to control and redistribute stresses after cracking results in a number of improvements in the structural behaviour of concrete. A review of existin...
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An experimental study was conducted to compare the structural behavior of beam column joint before and after rehabilitation by using fibrous concrete with steel fibers as a strength enhancer material. Two specimens were examined in this study out of which one was designed according to IS 456: 2000 (control specimen) codal provision and another one...
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Recently, the use of high-performance fiber-reinforced concrete (HPFRC) and superelastic alloys (SEAs) in bridge columns have been investigated to mitigate the damage and reduce or eliminate the permanent deformations. The HPFRC studied in this research uses synthetic fibers in a mortar base and has high ductility in tension and high energy absorpt...
Citations
... Meanwhile, 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. ...
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.
The full range behavior ductile and non-ductile frames have been evaluated under monotonic and cyclic loading. The one fourth scale Reinforced Concrete square frames are experimentally tested subjected to static cyclic loading for three cases and monotonic loading for one case. The parameters are varied as method introducing ductility to the frame by using conventional concrete, adding 1% of steel fibres by volume of concrete at hinging zones and self-compacting concrete with fibres at hinging zones. The results compared with respect to initial stiffness, degradation of stiffness, first cracking load, ultimate loads, degradation of load carrying capacity, energy absorption and ductility factors characteristics. The behavior of frames tested under cyclic loading have revealed that there is a positive trend in improvement of ductility of frames when fibrous concrete is used along with self-compacting concrete. Also, the behavior of conventional reinforced concrete frame against monotonic loading has been studied numerically using commercial finite element tool ABAQUS/Standard and compared with the experiments are found in good agreement.
