Publication: Flexural behavior of natural hybrid frp-strengthened rc beams and strain measurements using botda
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Issued Date
2021
Resource Type
Language
eng
File Type
application/pdf
ISSN
20734360
Other identifier(s)
2-s2.0-85117755487
Rights Holder(s)
Scopus
Bibliographic Citation
Polymers. Vol 13, No.20 (2021)
Suggested Citation
Chaiyasarn K., Ali N., Phuphasuwan P., Poovarodom N., Joyklad P., Mohamad H., Zhou M., Hussain Q. Flexural behavior of natural hybrid frp-strengthened rc beams and strain measurements using botda. Polymers. Vol 13, No.20 (2021). doi:10.3390/polym13203604 Retrieved from: https://hdl.handle.net/20.500.14740/8168
Abstract
Experimental and finite element analysis results of reinforced concrete beams under monotonic loading were presented in this study. In the experimental program, one beam was tested in an as-built condition. The other two beams were strengthened using natural hybrid FRP layers in different configurations. The natural hybrid FRP composite was developed by using natural jute FRP and basalt FRP. One of the most appealing advantages of natural fiber is its beneficial impact on the environment, which is necessary for the sustainability recognition as an alternative to synthetic FRP. The hybrid FRP was applied to the bottom concrete surface in one beam, while a U-shaped strengthening pattern was adopted for the other beam. The flexural behavior of each beam was assessed through strain measurements. Each beam was incorporated with conventional strain gages, as well as the Brillouin Optical Time Domain Analysis (BOTDA) technique. BOTDA has its exclusive advantages due to its simple system architecture, easy implementation, measurement speed, and cross-sensitivity. The experimental results revealed that the beam strengthened with the U-shaped hybrid FRP composite pattern had a better flexural response than the other counterpart beams did both in terms of peak loads and maximum bottom longitudinal steel bar strains. Beams B-01 and B-02 exhibited 20.5% and 28.4% higher energy dissipation capacities than the control beam did, respectively. The ultimate failure of the control beam was mainly due to the flexural cracks at very low loads, whereas the ultimate failure mode of FRP composite-strengthened beams was due to the rupture of the hybrid FRP composite. Further, strain measurements using BOTDA exhibited similar patterns as conventional strain gage measurements did. However, it was concluded that BOTDA measurements were substantially influenced by the bottom flexural cracks, ultimately resulting in shorter strain records than those of conventional strain gages. Nonlinear structural analysis of the beams was performed using the computer program ATENA. The analytical results for the control beam specimen showed a close match with the corresponding experimental results mainly in terms of maximum deflection. However, the analytical peak load was slightly higher than the corresponding experimental value. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.
Subject(s)
Basalt
Concrete beams and girders
Energy dissipation
Reinforced concrete
Software testing
Strain gages
Strain measurement
Sustainable development
Time domain analysis
ATENA
Basalt FRP
Brillouin optical time domain analysis
Control beams
Flexural behavior
FRP composite
Natural hybrid FRP
Natural jute FRP
Strain-gages
Strains measurements
Optical fibers
Concrete beams and girders
Energy dissipation
Reinforced concrete
Software testing
Strain gages
Strain measurement
Sustainable development
Time domain analysis
ATENA
Basalt FRP
Brillouin optical time domain analysis
Control beams
Flexural behavior
FRP composite
Natural hybrid FRP
Natural jute FRP
Strain-gages
Strains measurements
Optical fibers