Study on the Flexural Fatigue Performance of CFRP-OFBG Plate Reinforced Damaged Steel Beams
- Resource Type
- Authors
- Zheng Zhou; Mengjun Zhong; Shijin Lai; Yang Liu; Ling Liao; Lizhen Lei; Langni Deng
- Source
- KSCE Journal of Civil Engineering. 25:4686-4697
- Subject
- Flexural fatigue
Materials science
Fiber Bragg grating
Test beam
business.industry
Service life
Cyclic loading
Fatigue damage
Structural engineering
Paris' law
business
Reinforcement
Civil and Structural Engineering
- Language
- ISSN
- 1976-3808
1226-7988
This paper studies the flexural fatigue performance of damaged steel beams strengthened by carbon fiber reinforced plastic-optical fiber bragg grating (CFRP-OFBG) plates. By analyzing the test beam’s failure mechanism under cyclic loading and the strain data monitored by the CFRP-OFBG panel in real-time, a life prediction model based on cumulative fatigue damage is proposed. The test results show that CFRP-OFBG plate reinforcement effectively reduces the fatigue crack growth rate of damaged steel beams and increases the fatigue life of damaged steel beams by 22.46%. The analysis and test results show that the minimum error between the calculated value of the life prediction model and the test value is −24.13%, and the maximum error is −5.61%. This study provides some suggestions for improving the service life of existing fatigue-damaged steel beams and establishing a simple fatigue life evaluation model.