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Axial compression tests on CFRP strengthened CFS plain angle short columns
K S Vivek1, Mohammad Adil Dar2, M I Ali1
1Department of Civil Engineering, Vasireddy Venkatadri Institute of Technology, Guntur, 522508, AP, India.
Scientific Reports
|March 28, 2024
Summary
Carbon Fiber Reinforced Polymer (CFRP) strengthening significantly enhances the axial strength and stability of cold-formed steel (CFS) columns. Configurations like uni-directional CFRP wraps, especially with cardboard infill, dramatically increase load-bearing capacity and prevent buckling.
Area of Science:
- Structural Engineering
- Materials Science
- Civil Engineering
Background:
- Cold-formed steel (CFS) columns are susceptible to buckling under axial compression.
- Strengthening techniques are crucial for improving the performance of CFS structures.
Purpose of the Study:
- To experimentally investigate the impact of Carbon Fiber Reinforced Polymer (CFRP) strengthening on the axial strength and stability of CFS plain angle short columns.
- To evaluate different CFRP strengthening configurations, including fiber orientation and layering.
Main Methods:
- Testing of 28 CFS plain angle short column specimens under monotonic axial compression.
- Application of uni-directional (CF_UD) and bi-directional (CF_BD) CFRP strengthening with varying configurations and layers.
- Inclusion of cardboard infill in some specimens.
Main Results:
- CF_UD-0° strengthening increased axial capacity by up to 58.33% for single layers.
- Double layers of CFRP, particularly CF_UD-0°/BD, further enhanced capacity.
- Cardboard infill combined with CF_UD-0° wrap prevented torsional buckling and boosted capacity by up to 240.61%.
Conclusions:
- CFRP strengthening is an effective method to improve the axial strength and stability of CFS columns.
- The configuration, fiber orientation, and layering of CFRP significantly influence performance.
- Cardboard infill offers substantial benefits in preventing buckling and increasing load capacity.
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