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1
Content available Stress–strain relationship of ductile materials and flexural behavior of ductile over-reinforced concrete beams
Duhaim Hussein M., Mashrei Mohammed A.
Przegląd Naukowy Inżynieria i Kształtowanie Środowiska
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2022
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Vol. 31, No. 4
225--237
EN
This paper aimed to investigate the effect of using ductile materials in the compression zone on the flexural performance of over-reinforced concrete beams. In order to avoid brittle compression failure, partial replacement of concrete with ductile materials layer in the compression zone was used. Four over-reinforced concrete beams of size 120 × 180 × 1,300 mm were cast and tested under three-point loading conditions. The steel fibers reinforced concrete (SFRC), slurry infiltrated fiber concrete (SIFCON), and ultra-high performance fiber reinforced concrete (UHPFRC) were used as ductile materials. The flexural capacity of the beams, failure modes, crack patterns, load-deflection relationships, ductility index, and toughness were investigated. The results showed that using ductile materials in the compression zone is an effective technique to increase the ultimate load, ductility, and toughness by up to 52.46, 84.78 and 279.93%, respectively, compared to the reference beam. In addition, the failure mode changed from brittle to ductile failure. Noting that the use of SFRC layer enhanced the ductility of over-reinforced concrete beams more than using UHPFRC and SIFCON layers. Also, one of the main advantages of this technique is led to increase the tensile reinforcement ratio up to 8.548% without needing the compressive reinforcement. Thus, ductile composite beams with a high flexural capacity were generated using an economical amount of ductile materials.
2
Content available remote Studies on the behaviour of steel fibre-reinforced concrete under monotonic and repeated cyclic stress in compression
Jayanth K., Shesha Prakash M. N., Suresh G. S., Naveen B. O.
Archives of Civil and Mechanical Engineering
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2022
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Vol. 22, no. 1
art. no. e50, 2022
EN
Steel fibre-reinforced concrete (SFRC) has shown better performance behaviour with respect to the post-crack strength and in restricting the crack width and its propagation. Studies on behaviour of SFRC under repeated loading are a significant work. Behaviour of reinforced concrete structures during ground excitations in the form of earthquake forces could be significantly improved by addition of steel fibres in suitable dosage. Fibre type, aspect ratio, and dosage of fibres significantly influence the behaviour of steel fibre-reinforced concrete. Here, the work carried by various researchers with respect to the studies on the behaviour of SFRC under monotonic and cyclic stress in compression is presented. An experimental investigation on stress–strain characteristics of SFRC under monotonic loading in compression was carried, comprising M20 grade concrete, hooked-end steel fibres (l = 50 mm, diameter = 1 mm), and varying fibre dosages of 1.0, 1.25, 1.5, and 1.75% by volume of concrete. The stress–strain characteristics arrived based on the above experimental studies were compared with theoretical stress–strain characteristics, based on the equations proposed in literature. This served in understanding the behaviour of SFRC with respect to their stress–strain characteristics using experimental studies and by theoretical models, and analyse the extent of agreement and acceptance.
3
Content available Shear behavior of steel or basalt fiber reinforced concrete beams without stirrup reinforcement
Krassowska J., Kosior-Kazberuk M.
Technical Sciences / University of Warmia and Mazury in Olsztyn
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2017
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nr 20(4)
391--404
EN
The paper presents the results of a comprehensive investigation aimed at studying the shear behavior of basalt or steel fiber-reinforced concrete (BFRC or SFRC) beams, as well as analyzing the possibility of using basalt or steel fibers as a minimum shear reinforcement. Two-span reinforced concrete beams with the cross-section of 8×16 cm and length of 200 cm and diversified spacing of stirrups were tested. Steel stirrups or alternatively steel or basalt fibers were used as a shear reinforcement. Steel fiber content was 80 and 120 kg/m3 and basalt fiber content was 2.5 and 5.0 kg/m3 . The shear behavior and/or bending capacity of SFRC and BFRC beams were studied. The result indicated that fibers can be safely used as a minimum shear reinforcement.
4
Content available remote Beton ze zbrojeniem rozproszonym dla budownictwa podziemnego
Jamroży Z.
Górnictwo i Geoinżynieria
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2003
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R. 27, z. 3--4
331-335
PL
Artykuł zawiera zakres i uzasadnienie stosowania drutobetonu w budownictwie podziemnym. Wskazuje ponadto na beton uzyskiwany metodą dwuetapową. We wnioskach zwrócono uwagę na możliwości dalszego stosowania tych betonów.
EN
The paper presents the range and the justification of SFRC use in underground engineering. The concrete obtained with the two-stage method is also pointed. The possibilities of the further application of concrete kinds are marked in the conclusions.
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