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Experimental Study on the Impact of Using FRP Sheets on the Axial Compressive Performance of Short-Circular Composite
Jie Liu1, Deliang Ma1, Feifei Dong2
1College of Civil Engineering, Nanjing Forestry University, Nanjing 210037, China.
Materials (Basel, Switzerland)
|October 14, 2023
Summary
Adding more fiber-reinforced polymer (FRP) layers to steel-concrete composite columns significantly boosts compressive strength and stiffness. This study proposes a four-stage confinement mechanism to better understand damage in these enhanced structural components.
Area of Science:
- Structural Engineering
- Materials Science
- Civil Engineering
Background:
- Composite columns offer enhanced structural performance compared to traditional materials.
- Understanding the axial compressive behavior of Fiber-Reinforced Polymer (FRP)-steel-concrete composite columns is crucial for optimizing their design and application in construction.
Purpose of the Study:
- To experimentally investigate the axial compressive performance of FRP-steel-concrete composite columns.
- To analyze the influence of FRP layers on failure modes, compressive strength, and stiffness.
- To propose a confinement mechanism for FRP-wrapped steel tube concrete composite columns.
Main Methods:
- Fabrication and experimental testing of nine short columns: three reference (steel tube concrete) and six composite (FRP-steel-concrete).
- Observation and analysis of failure modes (shear failure, waist drum).
- Evaluation of the effect of the number of FRP layers and material properties (tensile strength, elastic modulus of CFRP) on performance.
Main Results:
- Failure modes transitioned from shear failure towards waist drum with an increased number of FRP layers.
- Compressive strength increased directly with the number of FRP layers.
- Higher tensile strength and elastic modulus of Carbon Fiber-Reinforced Polymer (CFRP) sheets led to improved compressive stiffness.
Conclusions:
- The number and properties of FRP layers significantly enhance the axial compressive performance of steel-concrete composite columns.
- A novel four-stage confinement mechanism is proposed to characterize damage mechanisms in these composite structures.
- Findings provide valuable insights for the rational design and application of advanced composite columns.
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