Experimental investigation of steel fibers effect on the cyclic behavior of flexural members with moderate ductility

Gatabi, Hamed Rajabzadeh; Celikag, Murude; Bengar, Habib Akbarzadeh

doi:10.1016/j.istruc.2021.09.022

Cited by 1 publication

(2 citation statements)

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“…This may be due to the nonlinear behavior of the materials (concrete and rebar) or to the failure of separate reinforcement concrete specimen components beginning at different load levels. As a result, it has been standard practice to define parameters affecting reinforcement concrete members' ductility by an idealized bilinear load-displacement relationship [30]. T Fig.…”

Section: Resultsmentioning

confidence: 99%

“…epeated loading causes micro-cracks inside the beams by loading and unloading. Thus, the concrete beam is subjected to deformations, which decrease the structural element's strength and increase the beam's level of damage, reducing stiffness [30]. In this study, to calculate the stiffness degradation per cycle, the line between the maximum load at the end of the cycle and the load at the beginning of this cycle was drawn, and then the slope of this line was calculated [23].…”

Section: Stiffnessmentioning

confidence: 99%

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Experimental and numerical investigations of the flexural behaviour ‎of Green - Ultra High Performance Fiber Reinforced Concrete ‎beams under repeated loads

Abdo

asker

sobhy

et al. 2023

Frattura Ed Integrità Strutturale

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There are various benefits to ultra-high-performance fiber-reinforced concrete ‎‎(UHPFRC). However, using a lot of cement in this type of concrete has a severe disadvantage since it causes pollution and several environmental concerns. Therefore, another type of concrete that achieves the same superior properties as UHPFRC while using less cement in the mixture should be considered. This research examined replacing cement with fly ash to produce environmentally friendly concrete called Green-UHPFRC. The impact of utilizing G-UHPFRC on the flexural behaviour of thirteen beams was investigated experimentally and numerically under repeated loads. The major parameters of the study were fly ash replacement ratios of 15%, 30%, and 45% and adding steel fiber to mixes with ratios of 1, 2, 3, and 4%. The tested beams were compared to the control beam in their backbone and hysteresis curves, failure load, crack propagation and failure modes, energy dissipation, stiffness degradation, and ductility index. From the results obtained, environmentally friendly concrete (G-UHPFRC) can be produced by replacing cement with fly ash up to 45% and adding 2% steel fiber without affecting the bending performance of beams made of G-UHPFRC compared to those made of UHPFRC.

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Section: Resultsmentioning

confidence: 99%

Section: Stiffnessmentioning

confidence: 99%