Flexural behavior of GFRP bar-reinforced concrete beams with U-shaped UHPC stay-in-place formworks

Zhang, Pu; Shang, Jia-Qi; Liu, Ye; Shao, Jinggan; Dong, Zhiqiang; Sheikh, Shamim A.

doi:10.1016/j.jobe.2021.103403

Cited by 9 publications

(9 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It shows that the existence of HPFRC has a significant improvement on the pre-cracking stiffness. This result is the same as the research results of Zhang et al 39 In addition, the crack load and ultimate load of beams strengthened with ECC layer increased by 31.3%-66.7% and 10.9% (except the beam T-E with ECC debonding) relative to the beam R. Compared with the reference beam, the beams strengthened with UHPC layer had 33.3%-170% and 9.6%-20.7% higher associated with crack load and ultimate load. The results show that the flexural performance of beams strengthened with HPFRC has been greatly improved.…”

Section: Load-deflection Curvessupporting

confidence: 92%

“…After cracking, the GFRP bar bore more stress and its strain grew rapidly with increasing load. This is consistent with the conclusion of Zhang et al 39 Under the same load, the strain of GFRP bar in reference beam had the larger values relative to the beams strengthened with UHFRC material, indicating that the bottom high-performance fiber-reinforced concrete layer could bear a portion of the GFRP bars in tension zone.…”

Section: Strain Responsesupporting

confidence: 91%

“…38 Beams of the same size had been used many times in many studies. 39,40 In this paper, a total of five beams were designed, including a reference beam and four beams strengthened with the bottom and three-sides ECC or UHPC (20 mm thick) strengthening layers, respectively. All beams had the same dimensions with 2000 mm Â 250 mm Â 150 mm (see Figure 1).…”

Section: Specimen Designmentioning

confidence: 99%

“…Many scholars have provided some ideas for the preparation of HPFRC strengthened beams: pouring HPFRC layer first, and then pouring ordinary concrete in special formwork. 36,37,39 In this paper, the preparation process of the specimen is shown in Figure 4. No special interface treatment was considered between the HPFRC layer and concrete, that is, UHPC/ECC layer was first poured in the bottom of the wooden formwork (Figure 4a), and then concrete was poured after the UHPC/ECC was cured for 7 days at the room temperature.…”

Section: Specimen Preparationmentioning

confidence: 99%

“…The size of the beam is determined according to the laboratory conditions and financial conditions and meets the requirements of code GB 50010 38 . Beams of the same size had been used many times in many studies 39,40 . In this paper, a total of five beams were designed, including a reference beam and four beams strengthened with the bottom and three‐sides ECC or UHPC (20 mm thick) strengthening layers, respectively.…”

Section: Experimental Programmentioning

confidence: 99%

See 4 more Smart Citations

Flexural behavior of beams strengthened with GFRP bars and high‐performance fiber‐reinforced concrete

Su,

Shang,

Zhang

et al. 2024

Structural Concrete

Self Cite

View full text Add to dashboard Cite

The flexural behavior of beams strengthened with GFRP bars and high‐performance fiber‐reinforced concrete (HPFRC) was investigated in this paper. The four‐point flexural response of one reference beam and four beams strengthened with high‐performance fiber‐reinforced concrete was investigated by experimental research and theoretical calculation. The experimental and theoretical data (strain, load, etc.) are discussed. Parameters varied included the strengthening scheme (bottom‐side strengthening and three‐side strengthening) and the type of high‐performance fiber‐reinforced concrete (engineered cementitious composite [ECC] and ultra‐high‐performance concrete [UHPC]). The results showed that the cracking load and ultimate load of beams strengthened with UPFRC material were 31.3%–170% and 9.6%–20.7% higher, respectively, relative to the reference beam. Beams with three‐side strengthening (without interfacial debonding) had higher ultimate load, smaller crack width, and better durability relative to beams with bottom‐side strengthening. The UHPC layer was more effective in increasing the ultimate bearing capacity, and ECC strengthening layer was more effective in inhibiting cracking development of beams. Based on the experimental results, a model was proposed to predict the ultimate bearing capacity of beams strengthened with high‐performance fiber‐reinforced concrete, which could provide good agreement between the experimental and predicted results.

show abstract

Section: Load-deflection Curvessupporting

confidence: 92%

Section: Strain Responsesupporting

confidence: 91%

Section: Specimen Designmentioning

confidence: 99%

Section: Specimen Preparationmentioning

confidence: 99%

Section: Experimental Programmentioning

confidence: 99%

See 3 more Smart Citations

Flexural behavior of beams strengthened with GFRP bars and high‐performance fiber‐reinforced concrete

Su,

Shang,

Zhang

et al. 2024

Structural Concrete

Self Cite

View full text Add to dashboard Cite

show abstract

Interface Shear Analysis of UHPC‐NC with U‐Shaped Shear Stud

Lu,

Lin,

Zhang

et al. 2023

ce papers

View full text Add to dashboard Cite

The composite structure composed of ultra‐high performance concrete (UHPC) and normal concrete (NC) has been widely applied to engineering structures. U‐shaped shear studs play an important role in the combination of the UHPC‐NC interface. To investigate the interface shear characteristics of UHPC‐NC with U‐shaped shear studs, the numerical model with 14 various parameters is calculated based on the interface push tests. The influences of diameter, stud number, NC elastic modulus, NC compressive strength on the shear characteristics of the UHPC‐NC interface are analyzed. The results show that the load‐slip curves of the UHPC‐NC interface with a U‐shaped shear stud have three stages: elastic stage, elastoplastic stage and descending stage. The fitting formula with the power function as the basic function can well express the influence law of diameter on the interface shear capacity. The interface shear capacity is not sensitive to the elastic modulus and compressive strength of NC, and it does not increase or decrease with the increase of stud number, the shear strength of a single stud tends to be constant.

show abstract

Research on improving the durability performance of damaged concrete based on ultra high performance concrete repair

Wang,

Liu,

Zhang

et al. 2023

Engineering Reports

View full text Add to dashboard Cite

This article uses ultra‐high performance concrete (UHPC) to repair damaged concrete and analyzes the durability performance of the repaired concrete. Among them, three erosion solutions with a mass concentration of 2.8% NaCl + 0.29% Na2SO4, 5% NaCl, and 5% NaCl + 10% Na2SO4 were designed to soak the concrete specimens for 1 to 3 months. Taking the SWC test group as an example, when the concrete test block undergoes 30 dry wet cycles and the erosion depth is 20 mm, the difference in chloride ion concentration under different diffusion dimensions is not significant. After 90 dry wet cycles, at a depth of 20 mm, the chloride ion concentration inside the concrete in the three‐dimensional diffusion state reached 3 times that of one‐dimensional diffusion, and the chloride ion concentration in the two‐dimensional diffusion state also reached 2 times that of one‐dimensional diffusion. At a depth of 30 mm, a small amount of chloride ion content was also found in the two‐dimensional diffusion and three‐dimensional diffusion.

show abstract

Flexural behavior of GFRP bar-reinforced concrete beams with U-shaped UHPC stay-in-place formworks

Cited by 9 publications

References 37 publications

Flexural behavior of beams strengthened with GFRP bars and high‐performance fiber‐reinforced concrete

Flexural behavior of beams strengthened with GFRP bars and high‐performance fiber‐reinforced concrete

Interface Shear Analysis of UHPC‐NC with U‐Shaped Shear Stud

Research on improving the durability performance of damaged concrete based on ultra high performance concrete repair

Contact Info

Product

Resources

About