Experimental investigation on the effect of longitudinal reinforcement on shear strength of fibre reinforced polymer reinforced concrete beams

Alam, Shah; Hussein, Amgad

doi:10.1139/l10-126

Cited by 35 publications

(24 citation statements)

References 3 publications

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“…Shear keys are typically unreinforced, and unreinforced concrete is poor in tension. When mixing fibers such as steel or glass fibers into concrete constituent, tensile strength of concrete as well as shear capacity of monolithic beams can be enhanced [5][6][7][8][9][10]. This paper presents an attempt to improve the shear capacity of dry joints by adding steel fiber and glass fiber into concrete mixture.…”

Section: Introductionmentioning

confidence: 99%

Improvement of shear capacity for precast segmental box girder dry joints by steel fiber and glass fiber

2019

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The use of precast segmental box girders in the bridge construction projects yields many benefits: economy, high quality, rapid construction, and minimal disruption to site. Previously, precast segments are connected together by epoxy joints. Epoxy fills in the gaps and makes strong connection, but it takes time and effort in the construction process. Later, dry joints have been introduced in the process, and hence the construction could be done much faster. However, there exists some drawback in using the dry joints. The contact surface between segments, especially at shear keys, can hardly be made smooth and well-fitted together. Consequently, the transferred shear strength cannot be developed to its full capacity. This study is an attempt to improve the capacity of shear strength of dry joints by adding steel fiber and glass fiber into concrete mixture. Considering specimens with single shear key, experiments have been conducted for shear capacities of 5 specimen types: ordinary concrete, concrete mixed with 1% and 2% steel fiber, and concrete mixed with 1% and 2% glass fiber. Results from experiments have shown that steel fiber helps increase the shear capacity of dry joints while glass fiber somehow degenerates the shear capacity and the compressive strength of concrete.

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Section: Introductionmentioning

confidence: 99%

Improvement of shear capacity for precast segmental box girder dry joints by steel fiber and glass fiber

2019

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“…ACI 440.1R-03 guidelines assumed a linear relationship between concrete shear strength and the modulus of elasticity of FRP bar [32], but most of the research shows a cubic root relationship between them [11, 12, 15-19, 22, 26] and some others assumed a square root relationship (CSA S6-06 [36], CNR DT 203 [26], and ISIS-M03-01 [24] design manual). Concrete shear strength is usually taken to be proportional to c to the power of 0.5 [21,24,27,32,37] and this study also found c to the power of 0.5 as appropriate to predicting good result. Nehdi et al [14,20] used c to the power of 0.23 and 0.3 in the consecutive study.…”

Section: Modulus Of Elasticity Of Frp Bar ( )mentioning

confidence: 57%

“…Kara [16] showed good result with a power of (1/9) for / ratio. Razaqpur et al [17] and Alam and Hussein [18] suggest that ( / ) to the power of 0.3 is proportional to the concrete shear strength. Wegian and Abdalla [19] used ( / ) to the power of (1/3) for their study.…”

Section: Shear Span To Depth Ratio ( / )mentioning

confidence: 99%

Development of Shear Capacity Prediction Model for FRP-RC Beam without Web Reinforcement

Chowdhury

Zahid

Islam

2016

Advances in Materials Science and Engineering

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Available codes and models generally use partially modified shear design equation, developed earlier for steel reinforced concrete, for predicting the shear capacity of FRP-RC members. Consequently, calculated shear capacity shows under- or overestimation. Furthermore, in most models some affecting parameters of shear strength are overlooked. In this study, a new and simplified shear capacity prediction model is proposed considering all the parameters. A large database containing 157 experimental results of FRP-RC beams without shear reinforcement is assembled from the published literature. A parametric study is then performed to verify the accuracy of the proposed model. Again, a comprehensive review of 9 codes and 12 available models is done, published back from 1997 to date for comparison with the proposed model. Hence, it is observed that the proposed equation shows overall optimized performance compared to all the codes and models within the range of used experimental dataset.

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Section: Introductionmentioning

confidence: 99%

“…Alam et al [ 17 ] studied the shear strength of FRP reinforced members without transverse reinforcement and reported that the normalized shear strength increased linearly with the cube root of the axial stiffness of the reinforcing bars. However, there were similar results for the shear strength of FRP reinforced elements where it was proportional to the axial stiffness of the longitudinal reinforcement obtained by Alam et al [ 17 ], El-Sayed et al [ 18 , 19 ], and Razaqpur et al [ 20 ]. Hence, the conclusion that the shear strength was proportional to the amount of longitudinal reinforcement was reached by Alkhrdaji et al [ 21 ], and the effect of the reinforcement stiffness and amount of reinforcement on the shear strength of FRP elements, despite no significant influence of the longitudinal reinforcement ratio on the shear strength, was observed by Yost et al [ 22 ].…”

Section: Introductionmentioning

confidence: 99%

Tensile and Shear Testing of Basalt Fiber Reinforced Polymer (BFRP) and Hybrid Basalt/Carbon Fiber Reinforced Polymer (HFRP) Bars

et al. 2020

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The use of sustainable materials is a challenging issue for the construction industry; thus, Fiber Reinforced Polymers (FRP) is of interest to civil and structural engineers for their lightweight and high-strength properties. The paper describes the results of tensile and shear strength testing of Basalt FRP (BFRP) and Hybrid FRP (HFRP) bars. The combination of carbon fibers and basalt fibers leads to a more cost-efficient alternative to Carbon FRP (CFRP) and a more sustainable alternative to BFRP. The bars were subjected to both tensile and shear strength testing in order to investigate their structural behavior and find a correlation between the results. The results of the tests done on BFRP and HFRP bars showed that the mechanical properties of BFRP bars were lower than for HFRP bars. The maximum tensile strength obtained for a BFRP bar with a diameter of 10 mm was equal to approximately 1150 MPa, whereas for HFRP bars with a diameter of 8 mm, it was higher, approximately 1280 MPa. Additionally, better results were obtained for HFRP bars during shear testing; the average maximum shear stress was equal to 214 MPa, which was approximately 22% higher than the average maximum shear stress obtained for BFRP bars. However, HFRP bars exhibited the lowest shear strain of 57% that of BFRP bars. This confirms the effectiveness of using HFRP bars as a replacement for less rigid BFRP bars. It is worth mentioning that after obtaining these results, shear testing can be performed instead of tensile testing for future studies, which is less complicated and takes less time to prepare than tensile testing.

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Experimental investigation on the effect of longitudinal reinforcement on shear strength of fibre reinforced polymer reinforced concrete beams

Cited by 35 publications

References 3 publications

Improvement of shear capacity for precast segmental box girder dry joints by steel fiber and glass fiber

Improvement of shear capacity for precast segmental box girder dry joints by steel fiber and glass fiber

Development of Shear Capacity Prediction Model for FRP-RC Beam without Web Reinforcement

Tensile and Shear Testing of Basalt Fiber Reinforced Polymer (BFRP) and Hybrid Basalt/Carbon Fiber Reinforced Polymer (HFRP) Bars

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