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Axial Strength of Eccentrically Loaded FRP-Confined Short Concrete Columns
Cheng Jiang1,2, Yu-Fei Wu1,3
1School of Engineering, RMIT University, 376-392 Swanston St, Melbourne, VIC 3001, Australia.
Polymers
|June 4, 2020
Summary
This study examined fiber reinforced polymer (FRP)-confined concrete columns under eccentric loading. FRP confinement reduces strength degradation and enhances axial strength in square columns, with effects varying by load eccentricity and specimen shape.
Area of Science:
- Civil Engineering
- Materials Science
Background:
- Eccentric loading significantly impacts the axial strength of concrete columns.
- Fiber Reinforced Polymer (FRP) confinement is a technique used to enhance concrete structures.
- Understanding the behavior of FRP-confined columns under eccentric loads is crucial for structural design.
Purpose of the Study:
- To investigate the axial strength degradation of FRP-confined square concrete columns under eccentric loading.
- To compare the performance of FRP-confined columns with unconfined specimens.
- To evaluate the influence of load eccentricity and corner radius on the strength enhancement and confinement efficiency.
Main Methods:
- An experimental program involving 78 FRP-confined square concrete columns subjected to eccentric loading was conducted.
- Axial strength and degradation were measured and analyzed.
- The effect of varying load eccentricities and corner radii was systematically studied.
Main Results:
- Increased load eccentricity led to a greater decrease in axial strength for all specimens.
- FRP confinement resulted in less strength degradation compared to unconfined concrete.
- Strength enhancement in square FRP-confined columns increased with load eccentricity.
- Confinement efficiency decreased for circular FRP-confined columns with increasing eccentricity.
Conclusions:
- FRP confinement effectively mitigates strength loss in square concrete columns under eccentric loads.
- The beneficial effect of FRP confinement on square columns is more pronounced at higher eccentricities.
- Design considerations for FRP-confined columns must account for load eccentricity and cross-sectional shape.
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