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Preparation of Aligned Steel Fiber Reinforced Cementitious Composite and Its Flexural Behavior
Published on: June 27, 2018
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Experimental Study on Concrete under Combined FRP-Steel Confinement
Stefan Kaeseberg1, Dennis Messerer1, Klaus Holschemacher1
1Structural Concrete Institute (IfB), Leipzig University of Applied Sciences, Karl-Liebknecht-Str. 132, 04277 Leipzig, Germany.
Materials (Basel, Switzerland)
|October 14, 2020
Summary
Fiber-reinforced polymer (FRP) confinement strengthens concrete structures. This study enhances design models for FRP-confined concrete, considering material properties and reduction factors for better load-bearing predictions.
Area of Science:
- Civil Engineering
- Materials Science
- Structural Engineering
Background:
- Fiber-reinforced polymers (FRPs) are effective for strengthening reinforced concrete (RC) structures.
- Existing design models for FRP-confined concrete exhibit significant variations.
- Limited experimental data exists for FRP-confined concrete with diverse material properties.
Purpose of the Study:
- To conduct a comprehensive experimental study on plain and reinforced FRP-confined concrete.
- To investigate the influence of concrete compressive strength and FRP reduction factors on confinement efficiency.
- To develop a modified design model for FRP-confined concrete.
Main Methods:
- Tested 63 carbon FRP (CFRP)-confined plain concrete specimens.
- Tested 60 CFRP-confined RC specimens with varying geometries and materials.
- Included literature data for a modified design model.
Main Results:
- Concrete compressive strength significantly impacts confinement efficiency in design.
- Accurate determination of reduction values for different FRP composites is crucial.
- Existing models show discrepancies in load-bearing behavior predictions.
Conclusions:
- A modified stress-strain and ultimate condition design model was developed.
- The study highlights the importance of material properties and reduction factors in FRP confinement.
- Enhanced design methodologies are needed for FRP-confined concrete structures.
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