INFLUENCE OF ADDITIONAL Al-RIBS ON LONG-TERM STIFFNESS OF PRE-TENSIONED CONCRETE BEAM REINFORCED WITH PRESTRESSED FRP BARS

SUN Yu; WANG Qiang; TONG Yixuan; ZHU Hong

doi:10.13204/j.gyjzG21042510

Volume 51 Issue 10

Feb. 2022

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SUN Yu, WANG Qiang, TONG Yixuan, ZHU Hong. INFLUENCE OF ADDITIONAL Al-RIBS ON LONG-TERM STIFFNESS OF PRE-TENSIONED CONCRETE BEAM REINFORCED WITH PRESTRESSED FRP BARS[J]. INDUSTRIAL CONSTRUCTION, 2021, 51(10): 9-13. doi: 10.13204/j.gyjzG21042510

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SUN Yu, WANG Qiang, TONG Yixuan, ZHU Hong. INFLUENCE OF ADDITIONAL Al-RIBS ON LONG-TERM STIFFNESS OF PRE-TENSIONED CONCRETE BEAM REINFORCED WITH PRESTRESSED FRP BARS[J]. INDUSTRIAL CONSTRUCTION, 2021, 51(10): 9-13. doi: 10.13204/j.gyjzG21042510

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INFLUENCE OF ADDITIONAL Al-RIBS ON LONG-TERM STIFFNESS OF PRE-TENSIONED CONCRETE BEAM REINFORCED WITH PRESTRESSED FRP BARS

doi: 10.13204/j.gyjzG21042510

SUN Yu¹,
WANG Qiang¹,
TONG Yixuan^1,2,
ZHU Hong^{1
,
,}

1. Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education, Southeast University, Nanjing 211189, China;
2. Dreaming Information Technology Corporation of Shanghai, Shanghai 200051, China

Received Date: 2021-04-25
Available Online: 2022-02-21

Abstract

Abstract

Degradation of long-term bonding performance will cause uncontrollable slippage between FRP bars and concrete. The additional Al-ribs are effective ways to improve bonding performance. In order to study the effect of Al-ribs on restraining the long-term stiffness degradation of prestressed concrete beams reinforced with FRP bars, 6 specimens were designed and fabricated, and short-term and long-term loading tests were carried out in sequence. By comparing the specimens without Al-ribs at the beam ends, the influence of Al-ribs on long-term deflection, slippage of FRP bars and development of crack width was comprehensively studied. The results showed that the additional Al-ribs could significantly inhibit the development of long-term deflection of the members, so that the prestressed concrete beams reinforced with FRP bars maintained good long-term performance. The maximum slippage of the specimens with short Al-ribs(SA) and long Al-ribs(LA) was reduced by 81.3% and 86.7%, respectively, and the slippage of the ribs was significantly suppressed. The crack width near the fixed end of the specimens without Al-ribs was increased by 323.53%, which was much larger than that of the specimens with Al-ribs. The additional Al-ribs had a significant effect on restraining the development of concrete cracks in the shear span area.
- pre-tensioned prestress,
- FRP bar,
- additional Al-rib,
- long-term stiffness

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References(18)

References

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