Flexural behavior and design of under-reinforced concrete beams with BFRP and steel bars

Shui, Lingling; Wang, Xin; Ali, Yahia M. S.; Su, Chunmei; Wu, Zhishen

doi:10.1016/j.engstruct.2022.114386

Cited by 31 publications

(8 citation statements)

References 34 publications

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“…Therefore, two calculation methods of reinforcement ratio, which are converted by elastic modulus and tensile strength, are widely used, that is, ρ ne = ρ s + ρ f ( E f / E s ) and ρ nf = ρ s + ρ f ( f fu / f y ), respectively, 14 where E f and E s represent the elastic modulus of FRP and steel reinforcements, respectively; f fu and f y denote the ultimate strength of FRP bars and yield strength of steel bars, respectively. According to the analysis of failure modes in previous literatures, 15,29 the BFRP and steel bars hybrid RC beams herein this study are designed to follow the requirements of ductile failure.…”

Section: Model Propositionmentioning

confidence: 99%

“…According to ACI 440.1R-2015, 23 the effective stress in FRP bar in tension can be obtained by Equation (14). The nominal moment capacity M n can be determined using Equation (15), proposed by the previous study. 17…”

Section: Ultimate Flexural Strengthmentioning

confidence: 99%

“…In hybrid RC beams, FRP and steel bars play different roles in improving strength and ductility. In the tension zone of a hybrid RC beam, steel bars are placed on the inner side for thicker concrete cover to prevent corrosion, while FRP bars are placed outside to ensure higher strength utilization, improve the flexural strength and crack‐limiting ability of the beam 14,15 …”

Section: Introductionmentioning

confidence: 99%

“…Similar results can be observed in Safan et al's study, 17 which showed that GFRP and steel bars hybrid RC beams exhibit better ductility and smaller crack width and spacing compared to GFRP bar RC beams. Liu et al 15 and Hussein et al 20 reported that the ratio of reinforcement ratios of FRP and steel bars, that is, A s / A f have an evident effect on the flexural behavior of hybrid RC beams due to its effect on the balance between strength and ductility in the flexural design. In addition, according to Ruan et al, 18 the midspan deflection of the hybrid RC beam is also affected by A s / A f .…”

Section: Introductionmentioning

confidence: 99%

“…In the tension zone of a hybrid RC beam, steel bars are placed on the inner side for thicker concrete cover to prevent corrosion, while FRP bars are placed outside to ensure higher strength utilization, improve the flexural strength and crack-limiting ability of the beam. 14,15 Recently studies [15][16][17][18] have investigated the flexural behavior of beams hybrid reinforced with steel and FRP bars. Maranan et al 16 and Sun et al 19 revealed that the addition of steel bars to BFRP bar RC beams effectively elevated the ductility of the beam.…”

Section: Introductionmentioning

confidence: 99%

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Flexural property and design method evaluation of BFRP and steel bars hybrid reinforced concrete beams

Wang

Ding

et al. 2023

Structural Concrete

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Fiber reinforced polymer (FRP) bars have been widely used as a replacement for steel bars in civil engineering due to their high strength and superior durability. However, compared to steel reinforced concrete (RC) beams, FRP RC beams have insufficient ductility and are more expensive. Therefore, a hybrid beam reinforced with steel and FRP bars has been proposed recently. In this study, the flexural properties of steel bar RC beam, basalt FRP (BFRP) bar RC beam, and BFRP steel bars hybrid RC beams were studied based on numerical simulation. The effect of As/Af on the stress of longitudinal reinforcements, load–midspan curves, ductility, and overall performance of the hybrid RC beams is analyzed. Results indicated that the hybrid RC beams exhibited a second‐order stiffness after the steel bars yielded owing to the contribution of the BFRP bars. As As/Af increases, the ductility of the hybrid RC beam and the strength utilization of BFRP bars increase, and a preferable ductility and overall performance can be achieved when As/Af was close to 1.0. The theoretical calculation results of hybrid RC beams based on ACI, CSA, and GB codes are compared with the simulation results, and the accuracy of the ultimate flexural strength of the prediction results is verified. In addition, equations for predicting the deflection of hybrid RC beams are proposed, and they exhibit higher prediction accuracy compared to the prediction models based on the ACI code.

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Section: Model Propositionmentioning

confidence: 99%

Section: Ultimate Flexural Strengthmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Flexural property and design method evaluation of BFRP and steel bars hybrid reinforced concrete beams

Wang

Ding

et al. 2023

Structural Concrete

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Experimental and theoretical investigations on the flexural behavior of precast concrete slabs reinforced with prestressing BFRP bars and fibers

Zhou,

Wang,

Ding

et al. 2024

Structural Concrete

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Prestressing basalt‐fiber‐reinforced polymer (BFRP) bars and three types of fibers were used to enhance precast slabs during construction. Experimental investigation was conducted on one control slab and three reinforced slabs, while equations for the flexural behavior of slabs and optimization were performed. The results demonstrated that the addition of fibers had minimal impact on the compressive strength of concrete, but significantly improved its flexural strengths by up to 36%. Fibers and BFRP bars with a prestress level of 40% enhanced the cracking load by a range of 506% to 584%, and the ultimate load by a range of 28% to 48%, while exerting minimal influence on the yield load. Reinforced slabs exhibited a reduction in yield deflection ranging from 57% to 67%, along with a decrease in ultimate deflection ranging from 33% to 42%. Prestress played a crucial role in controlling slab cracks, whereas fiber type had only minor effects. The equation derived for predicting experimental results regarding normal section cracking moment showed a maximum deviation not exceeding 5%. Material utilization can be improved by reducing slab thickness or the number of prestressing bars, followed by lowering prestress levels and truss numbers. Prioritizing reduction in slab thickness is recommended from a construction perspective.

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Mechanical Behavior of Concrete Bridge-Deck Slabs Reinforced with Hybrid Reinforcement

Ali,

Wang,

Liu

et al. 2023

Lecture Notes in Civil Engineering

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Flexural behavior and design of under-reinforced concrete beams with BFRP and steel bars

Cited by 31 publications

References 34 publications

Flexural property and design method evaluation of BFRP and steel bars hybrid reinforced concrete beams

Flexural property and design method evaluation of BFRP and steel bars hybrid reinforced concrete beams

Experimental and theoretical investigations on the flexural behavior of precast concrete slabs reinforced with prestressing BFRP bars and fibers

Mechanical Behavior of Concrete Bridge-Deck Slabs Reinforced with Hybrid Reinforcement

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