Flexural behavior of concrete beams with horizontal and vertical openings reinforced by glass-fiber-reinforced polymer (GFRP) bars

Ali, Hasan Hussein; Said, Abdul Muttailb I.

doi:10.1515/jmbm-2022-0045

Cited by 7 publications

(2 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…With its many advantages over conventional building materials like steel, glass fiber reinforced polymer (GFRP) is a suitable option for a variety of civil infrastructure applications, including bridges, parking, and marine structures. The high strength-to-weight ratio, light weight composition, and corrosion resistance of GFRP bars are noteworthy characteristics [3][4][5][6][7][8][9][10]. However, whеn comparеd to convеntional stееl, GFRP reinforced bars еxhibit cеrtain drawbacks, including a rеlativеly lowеr еlasticity modulus, rеducеd ductility, and diminishеd stiffnеss.…”

Section: Introductionmentioning

confidence: 99%

Effects of GFRP Stirrup Spacing on the Behavior of Doubly GFRP-Reinforced Concrete Beams

AbdulMuttalib Issa,

Allawi,

Oukaili

2024

Civ Eng J

View full text Add to dashboard Cite

This study investigates the impact of varying glass fiber-reinforced polymer (GFRP) stirrup spacing on the performance of doubly GFRP-reinforced concrete beams. The research focuses on assessing the behavior of GFRP-reinforced concrete beams, including load-carrying capacity, cracking, and deformability. It explores the feasibility and effectiveness of GFRP bars as an alternative to traditional steel reinforcement in concrete structures. Six concrete beams with a cross-section of 300 mm (wide) × 250 mm (deep), simply supported on a 2100 mm span, were tested. The beams underwent four-point bending with two concentrated loads applied symmetrically at one-third of the span length, resulting in a shear span (a)-to-depth (h) ratio of 2.8. The experimental findings reveal that altering the GFRP stirrup spacing along the longitudinal axis of the beams, from 200 mm (equivalent to the effective depth (d)) to 50 mm (equal to (d⁄4)), altered the mode of failure from flexure-shear to flexure-compression. However, when the spacing was equal to or less than (d⁄3), there was no significant improvement in load-carrying capacity, as the contribution of GFRP bars in resisting shear loads was limited. Under service loads, the GFRP-reinforced beams exhibited wider cracks, but reducing the stirrup spacing helped restrain crack widening. Incorporating GFRP bars in the compression zone had a positive effect on reducing crack width in the tension zone. Additionally, using GFRP stirrups with spacing varying between (d) and (d⁄2) in the pure bending region increased the deflection ductility indexes. To enhance the ductility of GFRP-reinforced concrete beams, it is recommended to use GFRP stirrups in the pure bending region with spacing greater than the spacing between GFRP stirrups in the shear spans. The study highlights that the current ACI code overestimates the shear capacity provided by GFRP stirrups, particularly when the spacing is less than or equal to (d⁄3). Doi: 10.28991/CEJ-2024-010-02-011 Full Text: PDF

show abstract

Section: Introductionmentioning

confidence: 99%

Effects of GFRP Stirrup Spacing on the Behavior of Doubly GFRP-Reinforced Concrete Beams

AbdulMuttalib Issa,

Allawi,

Oukaili

2024

Civ Eng J

View full text Add to dashboard Cite

show abstract

“…GFRP I-sections and GFRP bars are enhanced composite materials identified as potential new building materials. These materials may be used for RC in cases where the performance of steel reinforcement is insufficient, and corrosion of steel bars is one of the most lifelimiting problems of building materials [1]. Although the GFRP bars offer more flexibility in design as they can be used as individual bars and can be easily cut and bent on-site to accommodate specific project requirements [2], the GFRP Isection shape offers a higher moment of inertia, making it more resistant to bending and capable of withstanding larger loads without excessive deflection.…”

Section: Introductionmentioning

confidence: 99%

Theoretical Analysis of Composite RC Beams with Pultruded GFRP Beams subjected to Impact Loading

Ibrahim,

Alshaarbaf,

Allawi

et al. 2023

Eng. Technol. Appl. Sci. Res.

View full text Add to dashboard Cite

Glass Fiber Reinforced Polymer (GFRP) beams have gained attention due to their promising mechanical properties and potential for structural applications. Combining GFRP core and encasing materials creates a composite beam with superior mechanical properties. This paper describes the testing encased GFRP beams as composite Reinforced Concrete (RC) beams under low-velocity impact load. Theoretical analysis was used with practical results to simulate the tested beams' behavior and predict the generated energies during the impact loading. The impact response was investigated using repeated drops of 42.5 kg falling mass from various heights. An analysis was performed using accelerometer readings to calculate the generalized inertial load. The integrated acceleration record and the measured hammer load vs. time data were utilized to determine the generalized bending load and fracture energy. Four forms of energy were calculated at the maximum load. The total energy was calculated and divided into two parts: The first part was gained by the beam's rotational kinetic energy, the bending energy in the specimen, and the elastic strain energy. The second part was the hammer's kinetic energy before striking the beam. The analytical results showed that the bending energy was less than its rotational kinetic energy for the encased GFRP beams and the reference specimens. In contrast, the encased steel beams had high bending energy due to the higher impact load and deflection. Strain energy recorded lower energy values for all specimens with higher bending energy. There is a good agreement between the tested and the calculated inertial and bending force for all beams. The ratio of inertia force to the total impact load for the encased GFRP and encased steel beams to the reference beam is about 9% and 5%, respectively.

show abstract

Structural Behavior of Prestressed RC Dapped Beam with Openings Strengthened Using CFRP Sheets

Mohammad,

Abbas

2023

E3S Web Conf.

View full text Add to dashboard Cite

This research examines the strengthening efficiency of prestressed concrete dapped end beam with opening under monotonic point load. The study concerns with the position of the opening relative to the dapped end, the shape of opening, as circle or square, in addition, the effect of CFRP strengthening around the opening. The experimental program consisted of testing nine scaled down prestressed concrete dapped end beam specimens with single opening near the dapped end. Beam specimens consisted of one control beam and the remaining eight beams classified into two groups. The first group contained four unstrengthened specimens, whereas the second group included beams with opening strengthened using CFRP sheets. A full wrapping configuration for the opening region was adopted in this research. The results presented the detrimental influence of the openings on the shear strength of the dapped beam and the additional strength achieved from strengthening. This study concludes that the shear strength of the prestressed dapped beam decreased by the presence of openings in the web with maximum reduction about 20% when the opening was located close the dapped end. Based on the test results, the strengthened beams recovered significant part of their original load carrying capacity. Generally, prestressed dapped beams regain a maximum of 92% of their strength when openings with different configurations and locations were strengthened with full CFRP wrap.

show abstract

Flexural behavior of concrete beams with horizontal and vertical openings reinforced by glass-fiber-reinforced polymer (GFRP) bars

Cited by 7 publications

References 9 publications

Effects of GFRP Stirrup Spacing on the Behavior of Doubly GFRP-Reinforced Concrete Beams

Effects of GFRP Stirrup Spacing on the Behavior of Doubly GFRP-Reinforced Concrete Beams

Theoretical Analysis of Composite RC Beams with Pultruded GFRP Beams subjected to Impact Loading

Structural Behavior of Prestressed RC Dapped Beam with Openings Strengthened Using CFRP Sheets

Contact Info

Product

Resources

About