Innovative Hybrid Reinforcement for Flexural Members

Etman, Emad

doi:10.1061/(asce)cc.1943-5614.0000145

Cited by 21 publications

(10 citation statements)

References 10 publications

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“…Therefore, there is a need for a new method of construction to avoid such problems; that is durable, cost effective, and exhibits some ductility. A number of methods have been suggested to improve ductility, including hybridization of different types of fibrous material [5][6][7][8] and combining steel reinforcement with composite materials to make a rebar with an inner steel and an outer FRP [9][10][11][12][13]. These attempts were not practical to be implemented in the construction industry due to the high cost and complexity of manufacturing process.…”

Section: Introductionmentioning

confidence: 99%

Flexural performance of hybrid GFRP-Steel reinforced concrete continuous beams

Araba

Ashour

2018

Composites Part B: Engineering

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This paper presents the experimental results of five large-scale hybrid glass fiber reinforced polymer (GFRP)-steel reinforced concrete continuous beams compared with two concrete continuous beams reinforced with either steel or GFRP bars as reference beams. In addition, two simply supported concrete beams reinforced with hybrid GFRP/steel were tested. The amount of longitudinal GFRP, steel reinforcements and area of steel bars to GFRP bars were the main investigated parameter in this study. The experimental results showed that increasing the GFRP reinforcement ratio simultaneously at the sagging and hogging zones resulted in an increase in the load capacity, however, less ductile behaviour. On the other hand, increasing the steel reinforcement ratio at critical sections resulted in more ductile behaviour, however, less load capacity increase after yielding of steel.The test results were compared with code equations and available theoretical models for predicting the beam load capacity and load-deflection response. It was concluded that Yoon's model reasonably predicted the deflection of the hybrid beams tested, whereas, the ACI.440.1R-15 equation underestimated the hybrid beam deflections. It was also shown that the load capacity prediction for hybrid reinforced concrete continuous beams based on a collapse mechanism with plastic hinges at mid-span and central support sections was reasonably close to the experimental failure load.

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Section: Introductionmentioning

confidence: 99%

Flexural performance of hybrid GFRP-Steel reinforced concrete continuous beams

Araba

Ashour

2018

Composites Part B: Engineering

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“…The balance between increasing or decreasing flexural strength of RC members and ductility is a common discussion of researchers [14]. Ductility is the capacity of a structural member to absorb energy when it undergoes inelastic deformation.…”

Section: Ductility Behavior Of Slabsmentioning

confidence: 99%

“…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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“…To improve the performance of an FRP-reinforced concrete structure, a hybrid FRP bar with different ultimate strains was proposed [9] to achieve a certain degree of ductility, but this type of ductility was realized by the partial rupture of FRP with a low elongation rate, which will exhibit significant strength degradation during cyclic loading. Because a steel bar has a large elongation rate (approximately 15%), 2 Advances in Civil Engineering a better performance and a more acceptable cost can be achieved by combining steel and FRP.…”

Section: Introductionmentioning

confidence: 99%

“…( e b I and e b II ) of SFCB-reinforced concrete beam can be calculated by equations(8) and(9) [25]: sf y / cu ) ,…”

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confidence: 99%

Moment-Curvature Behaviors of Concrete Beams Singly Reinforced by Steel-FRP Composite Bars

Sun

Yang

Yan

et al. 2017

Advances in Civil Engineering

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A steel-fiber-reinforced polymer (FRP) composite bar (SFCB) is a kind of rebar with inner steel bar wrapped by FRP, which can achieve a better anticorrosion performance than that of ordinary steel bar. The high ultimate strength of FRP can also provide a significant increase in load bearing capacity. Based on the adequate simulation of the load-displacement behaviors of concrete beams reinforced by SFCBs, a parametric analysis of the moment-curvature behaviors of concrete beams that are singly reinforced by SFCB was conducted. The critical reinforcement ratio for differentiating the beam's failure mode was presented, and the concept of the maximum possible peak curvature (MPPC) was proposed. After the ultimate curvature reached MPPC, it decreased with an increase in the postyield stiffness ratio ( sf ), and the theoretical calculation method about the curvatures before and after the MPPC was derived. The influence of the reinforcement ratio, effective depth, and FRP ultimate strain on the ultimate point was studied by the dimensionless moment and curvature. By calculating the envelope area under the moment-curvature curve, the energy ductility index can obtain a balance between the bearing capacity and the deformation ability. This paper can provide a reference for the design of concrete beams that are reinforced by SFCB or hybrid steel bar/FRP bar.

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Innovative Hybrid Reinforcement for Flexural Members

Cited by 21 publications

References 10 publications

Flexural performance of hybrid GFRP-Steel reinforced concrete continuous beams

Flexural performance of hybrid GFRP-Steel reinforced concrete continuous beams

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

Moment-Curvature Behaviors of Concrete Beams Singly Reinforced by Steel-FRP Composite Bars

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