Flexural Behavior of Natural Hybrid FRP-Strengthened RC Beams and Strain Measurements Using BOTDA
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 configurat...
| Main Authors: | , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2021-10-01
|
| Series: | Polymers |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2073-4360/13/20/3604 |
| _version_ | 1797513295089893376 |
|---|---|
| author | Krisada Chaiyasarn Nazam Ali Phatthanayu Phuphasuwan Nakhorn Poovarodom Panuwat Joyklad Hisham Mohamad Mingliang Zhou Qudeer Hussain |
| author_facet | Krisada Chaiyasarn Nazam Ali Phatthanayu Phuphasuwan Nakhorn Poovarodom Panuwat Joyklad Hisham Mohamad Mingliang Zhou Qudeer Hussain |
| author_sort | Krisada Chaiyasarn |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-03-10T06:14:40Z |
| format | Article |
| id | doaj.art-ca283979e9404c748d417812404fec41 |
| institution | Directory Open Access Journal |
| issn | 2073-4360 |
| language | English |
| last_indexed | 2024-03-10T06:14:40Z |
| publishDate | 2021-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Polymers |
| spelling | doaj.art-ca283979e9404c748d417812404fec412023-11-22T19:48:20ZengMDPI AGPolymers2073-43602021-10-011320360410.3390/polym13203604Flexural Behavior of Natural Hybrid FRP-Strengthened RC Beams and Strain Measurements Using BOTDAKrisada Chaiyasarn0Nazam Ali1Phatthanayu Phuphasuwan2Nakhorn Poovarodom3Panuwat Joyklad4Hisham Mohamad5Mingliang Zhou6Qudeer Hussain7Thammasat Research Unit in Infrastructure Inspection and Monitoring, Repair and Strengthening (IIMRS), Thammasat School of Engineering, Thammasat University, Rangsit, Klong Luang Pathumthani 12121, ThailandDepartment of Civil Engineering, School of Engineering, University of Management and Technology, Lahore 54770, PakistanThammasat Research Unit in Infrastructure Inspection and Monitoring, Repair and Strengthening (IIMRS), Thammasat School of Engineering, Thammasat University, Rangsit, Klong Luang Pathumthani 12121, ThailandThammasat Research Unit in Infrastructure Inspection and Monitoring, Repair and Strengthening (IIMRS), Thammasat School of Engineering, Thammasat University, Rangsit, Klong Luang Pathumthani 12121, ThailandDepartment of Civil and Environmental Engineering, Srinakharinwirot University, Nakhonnayok 26120, ThailandCivil and Environmental Engineering Department, Universiti Teknologi PETRONAS, Seri Iskandar 32610, Perak, MalaysiaKey Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Department of Geotechnical Engineering, Tongji University, Siping Road 1239, Shanghai 12476, ChinaCenter of Excellence in Earthquake Engineering and Vibration, Department of Civil Engineering, Chulalongkorn University, Bangkok 10330, ThailandExperimental 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.https://www.mdpi.com/2073-4360/13/20/3604natural hybrid FRPBOTDAoptical fibersnatural jute FRPbasalt FRPATENA |
| spellingShingle | Krisada Chaiyasarn Nazam Ali Phatthanayu Phuphasuwan Nakhorn Poovarodom Panuwat Joyklad Hisham Mohamad Mingliang Zhou Qudeer Hussain Flexural Behavior of Natural Hybrid FRP-Strengthened RC Beams and Strain Measurements Using BOTDA Polymers natural hybrid FRP BOTDA optical fibers natural jute FRP basalt FRP ATENA |
| title | Flexural Behavior of Natural Hybrid FRP-Strengthened RC Beams and Strain Measurements Using BOTDA |
| title_full | Flexural Behavior of Natural Hybrid FRP-Strengthened RC Beams and Strain Measurements Using BOTDA |
| title_fullStr | Flexural Behavior of Natural Hybrid FRP-Strengthened RC Beams and Strain Measurements Using BOTDA |
| title_full_unstemmed | Flexural Behavior of Natural Hybrid FRP-Strengthened RC Beams and Strain Measurements Using BOTDA |
| title_short | Flexural Behavior of Natural Hybrid FRP-Strengthened RC Beams and Strain Measurements Using BOTDA |
| title_sort | flexural behavior of natural hybrid frp strengthened rc beams and strain measurements using botda |
| topic | natural hybrid FRP BOTDA optical fibers natural jute FRP basalt FRP ATENA |
| url | https://www.mdpi.com/2073-4360/13/20/3604 |
| work_keys_str_mv | AT krisadachaiyasarn flexuralbehaviorofnaturalhybridfrpstrengthenedrcbeamsandstrainmeasurementsusingbotda AT nazamali flexuralbehaviorofnaturalhybridfrpstrengthenedrcbeamsandstrainmeasurementsusingbotda AT phatthanayuphuphasuwan flexuralbehaviorofnaturalhybridfrpstrengthenedrcbeamsandstrainmeasurementsusingbotda AT nakhornpoovarodom flexuralbehaviorofnaturalhybridfrpstrengthenedrcbeamsandstrainmeasurementsusingbotda AT panuwatjoyklad flexuralbehaviorofnaturalhybridfrpstrengthenedrcbeamsandstrainmeasurementsusingbotda AT hishammohamad flexuralbehaviorofnaturalhybridfrpstrengthenedrcbeamsandstrainmeasurementsusingbotda AT mingliangzhou flexuralbehaviorofnaturalhybridfrpstrengthenedrcbeamsandstrainmeasurementsusingbotda AT qudeerhussain flexuralbehaviorofnaturalhybridfrpstrengthenedrcbeamsandstrainmeasurementsusingbotda |