Evaluation of beam-column joints made of HPFRCC composites to reduce transverse reinforcements

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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“…The energy dissipated per cycle equals the area under the load-deflection curve for this cycle. [32]. Fig.…”

Section: Energy Dissipationmentioning

confidence: 99%

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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“…It is a part of the energy the structure. The total dissipated energy is the area under the envelope curve [39]. The dissipated energy of one cycle is the enclosed area between the loading curve and the unloading curve for the cycle, as in Fig.…”

Section: Energy Dissipationmentioning

confidence: 99%

“…The stiffness is the force needed to make a unit displacement at the end of the beam for a sample beam-column joint [39]. The slope of the secant line of a cycle's curve is used to measure its stiffness, as shown in Fig.…”

Section: Stiffness Degradationmentioning

confidence: 99%

The impact of utilizing UHPFRC in beam-column joints with different patterns of transverse reinforcement

Abdo

Mohamed

Ryad

et al. 2023

Frattura Ed Integrità Strutturale

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This research studies and assesses the possibility of employing UHPFRC in exterior beam-column joints (BCJs). Eight specimens with various concrete material characteristics and steel reinforcing details are cast and examined under repeated loads. Normal concrete with seismic reinforcing details is used as a control specimen. For certain specimens, UHPC, UHPFRC with 1% steel fiber, and UHPFRC with 2% steel fiber are poured into all BCJs, and others are poured into the critical zone only. The consequences of removing stirrups from the joint were studied. All specimens' crack patterns, hysteresis and envelope curves, ductility factor, stiffness degradation‎, and energy dissipation are assessed and corresponded to the control sample. The results demonstrate that UHPFRC strengthened the joint, prevented crack development and extension and the shear failure in the joint, and formed the plastic hinge in the beams. UHPFRC outperforms normal concrete with seismic reinforcing details and UHPC without steel fiber in bearing capacity, ductility, stiffness, and energy dissipation. UHPFRC with 1% steel fiber enhanced joint behavior, while UHPFRC with 2% steel fiber was better. Casting the whole sample with UHPFRC achieved very little improvement. The presence of stirrups in the UHPFRC beam-column joint has little effect on its properties. It is more economical to casting UHPFRC in the joint zone only and reduce or eliminate these stirrups in the case of UHPFRC

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Hysteresis and damping properties of steel and polypropylene fiber reinforced recycled aggregate concrete under uniaxial low-cycle loadings

2022

Construction and Building Materials

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Evaluation of beam-column joints made of HPFRCC composites to reduce transverse reinforcements

Cited by 22 publications

References 24 publications

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

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

The impact of utilizing UHPFRC in beam-column joints with different patterns of transverse reinforcement

Hysteresis and damping properties of steel and polypropylene fiber reinforced recycled aggregate concrete under uniaxial low-cycle loadings

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