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Transfer Length vs. Slip of Prestressed Fiber-Reinforced Polymer Reinforcement
Aidas Jokūbaitis1, Juozas Valivonis1
1Department of Reinforced Concrete Structures and Geotechnics, Faculty of Civil Engineering, Vilnius Gediminas Technical University, Sauletekio Av. 11, LT-10223 Vilnius, Lithuania.
Polymers
|March 11, 2023
Summary
This study analyzes transfer length and slip in prestressed fiber reinforced polymer (FRP) reinforcement. New bond factors were proposed for carbon fiber composite cable (CFCC) and carbon fiber reinforced polymer (CFRP) bars, improving precast concrete quality control.
Area of Science:
- Civil Engineering
- Materials Science
Background:
- Prestressed concrete members often utilize fiber reinforced polymer (FRP) reinforcement.
- Understanding the bond behavior between FRP and concrete is crucial for structural integrity.
Purpose of the Study:
- To analyze the relationship between transfer length and slip for various prestressed FRP reinforcements.
- To propose new bond shape factors (α) for different FRP types based on experimental data.
- To compare theoretical models with experimental results for transfer length and slip.
Main Methods:
- Collected and analyzed data from approximately 170 prestressed FRP reinforcement specimens.
- Developed new bond shape factors (α) for CFCC, CFRP, and different AFRP types.
- Discussed theoretical models and compared them with experimental transfer length and slip data.
Main Results:
- Proposed new bond shape factors: α = 3.5 for CFCC strands, α = 2.5 for CFRP bars.
- Determined that AFRP bar type influences transfer length, proposing α = 4.0 for Arapree and α = 2.1 for FiBRA/Technora.
- Validated theoretical models against experimental transfer length and slip data.
Conclusions:
- The proposed bond shape factors enhance the understanding of FRP reinforcement bond behavior.
- Findings can be integrated into production and quality control for precast prestressed concrete.
- This research encourages further investigation into FRP reinforcement transfer length.
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