Hybrid fiber use on flexural behavior of ultra high performance fiber reinforced concrete beams

Türker, Kaan; Hasgül, Umut; Birol, Tamer; Yavaş, Altuğ; Yazıcı, Halit

doi:10.1016/j.compstruct.2019.111400

Cited by 83 publications

(50 citation statements)

References 51 publications

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“…Ductility is the capacity of a structural member to absorb energy when it undergoes inelastic deformation. Ductility can be found in the form of rotation, displacement and curvature [14][15][16]. The method of ductility by displacement has been employed in this research work.…”

Section: Ductility Behavior Of Slabsmentioning

confidence: 99%

Experimental Study on the Structural Behavior of Cast in-situ Hollow Core Concrete Slabs

et al. 2020

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An experimental work has been carried out to study the flexural behavior of cast in-situ hollow core reinforced concrete (HCRC) slabs constructed by using easy, cost effective and implementable techniques in field. The precast elements made of different easily available affordable material i.e. concrete, polyvinyl chloride (PVC) and plaster of paris having voided cross- sections of circular, rectangular and triangular shapes were incorporated in one direction during pouring of concrete with minimum flexural reinforcement to construct HCRC slabs. A total of 14 slab specimens including 02 specimens per specification were tested with third point loading for the assessment of flexural behavior as per ASTM standards C78/C78M. The flexural behavior of HCRC slabs with polyvinyl and plaster of paris elements having hollow cross-sections was comparable with the control solid slabs, however, HCRC slab with concrete pipes showed 7 to 8 percent reduction in flexural strength with 19 to 20 percent reduction in self-weight. All the tested specimens performed well in shear as no shear failure was observed. This study reveals that HCRC slabs with locally available material having hollow cross section elements can be used for the construction of cast in-situ monolithic construction of one-way slabs with ordinary construction techniques. Doi: 10.28991/cej-2020-03091597 Full Text: PDF

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Section: Ductility Behavior Of Slabsmentioning

confidence: 99%

Experimental Study on the Structural Behavior of Cast in-situ Hollow Core Concrete Slabs

et al. 2020

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“…Turker et al [38] studied the behaviour of UHPFRC beams with hybrid fibres experimentally and analytically. Beams have been cast with exceptional reinforcement ratios.…”

Section: Strength Of Uhpfrcmentioning

confidence: 99%

Influence of critical parameters on UHPFRC structural elements subjected to blast loading

Rizwanullah

Sharma

2020

SN Appl. Sci.

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Response of structures subjected to blast loading is a highly complex phenomena involving time-dependent deformation, geometric and material nonlinearities and loading rate based material properties. During an explosion, blast loads act as an impulsive load of very short duration developing enormous heat and pressure. With increasing terrorist threats, attention is needed to study dynamic response of structures under blast loading. Ultra high strength concrete (UHPC) has been found to considerably enhance strength, member size, weight reduction and workability and is now a day used due to improved energy absorption capacity, workability and anti-abrasion ability. Investigations conducted by several researchers to study blast-resistant capacities of UHPC have demonstrated possibilities of using the material in structures susceptible to terrorist attack. The present paper provides comprehensive review of published research to study blast loading effect on Ultra high performance fibre reinforced concrete (UHPFRC) structural elements in terms of variables like standoff distance, charge weight, types of blast loadings, grades of UHPFRCs, etc., both analytically and experimentally. UHPFRC slab panels, beams, columns, and other fibre composite structures have been studied at structural level to draw fruitful inferences and conclusions. It has been found that UHPFRC possesses increased capacity to disseminate large amount of energy during blast loading and demonstrates better performance after blast damage contrasted with normal strength concrete and High strength concrete. Detailing in UHPFRC structural elements under seismic condition offers improved blast performance, and UHPFRC can more effectively resist compression and shock waves. Low Strength and low ductility fibres added to UHPFRC further illustrates minimal influence on the blast performance and fracture energy. Shear failure is also found to be one of the dominant modes in UHPFRC under blast loading at close standoff. Based on extensive review, further research is proposed to solve complex problems to achieve appropriate design of structural UHPFRC members.

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“…Many efforts were conducted to practically calculate the capacities of both high strength and ultra-high strength fiber-reinforced concrete members, investigating the shape of the concrete stress block, ultimate strain capacity, fibers' geometrical properties, volumetric ratio, orientation, and bond stress, as well as other parameters affecting the tensile stress distribution [42][43][44][45][46][47][48][49][50]. More recently, the authors of this study proposed a numerical approach to predict the nominal moment capacity of UHP-FRC beams with rectangular cross-sections [14]. In the second part of the numerical investigations, the flexural capacity of the test beams, except for the NF beam, were numerically determined and compared with the experimental results.…”

Section: Numerical Predictions Of the Shear And Flexural Capacitiesmentioning

confidence: 99%

“…The flexural design principles developed for the normal-strength concrete cannot be directly applied to the UHP-FRC members since the compressive, tensile, and strain-hardening behaviors are distinct from those of the conventional concrete. In the scope of numerical investigations, an approach proposed by the authors [14] was used to predict the nominal moment capacity of UHP-FRC beams. Working together with this model, the use of a well-known equivalent stress block was maintained for the compression and tension regions, as shown in Figure 11.…”

Section: Predicting Of the Flexural Moment Capacitymentioning

confidence: 99%

“…In addition, the randomly dispersed steel fibers to the concrete mixture, which may be in straight, end-hooked, twisted, or other forms, improve the capacity in many different ways, such as the ductility, energy absorption capacity, and strength. When compared to the normal-strength fibrous concrete, the UHP-FRC has pretty good compressive and tensile strengths, strain capacity, and durability through its high-density matrix [1,8,9,[13][14][15][16]. The UHP-FRC's superior characteristics allow the use of higher reinforcement ratios over the limits stipulated in the design codes.…”

Section: Introductionmentioning

confidence: 99%

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Steel Fiber Use as Shear Reinforcement on I-Shaped UHP-FRC Beams

et al. 2019

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In the presented paper, the effectiveness of steel fiber use on the shear and flexure behaviors of ultra-high performance concrete (UHPC) beams and the feasibility of steel fibers in place of shear reinforcement were investigated experimentally. In this framework, a total of four I-shaped UHPC beams were produced for a high tensile reinforcement ratio of 2.2%. While two of them were non-fiber UHPC beams with and without the shear reinforcement to show the contribution of steel fibers, the remaining beams were made from the ultra-high performance steel fiber-reinforced concrete (UHP-FRC) having the short straight fibers with 1.5% and 2.5% by volume. The shear and flexural parameters, such as the load–deflection response, cracking pattern, failure mode, deflection, and curvature ductilities were discussed based on the four-point loading test results. While the reference beam without fiber and shear reinforcement failed by the shear with a sudden load drop before the yielding of reinforcement and produced no deflection capability, the inclusion of steel fibers to the UHPC matrix transformed the failure mode from shear to flexure through the fibers’ crack-bridging ability. It might be deduced that the moderate level of steel fiber use in the UHP-FRC beams may take the place of shear reinforcement in practical applications.

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Hybrid fiber use on flexural behavior of ultra high performance fiber reinforced concrete beams

Cited by 83 publications

References 51 publications

Experimental Study on the Structural Behavior of Cast in-situ Hollow Core Concrete Slabs

Experimental Study on the Structural Behavior of Cast in-situ Hollow Core Concrete Slabs

Influence of critical parameters on UHPFRC structural elements subjected to blast loading

Steel Fiber Use as Shear Reinforcement on I-Shaped UHP-FRC Beams

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