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Smart Structures and Systems Volume 17, Number 6, June 2016 , pages 859-880 DOI: https://doi.org/10.12989/sss.2016.17.6.859 |
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Damage detection of a cable-stayed bridge based on the variation of stay cable forces eliminating environmental temperature effects |
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Chien-Chou Chen, Wen-Hwa Wu, Chun-Yan Liu and Gwolong Lai
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| Abstract | ||
| This study aims to establish an effective methodology for the detection of instant damages occurred in cable-stayed bridges with the measurements of cable vibration and structural temperatures. A transfer coefficient for the daily temperature variation and another for the long-term temperature variation are firstly determined to eliminate the environmental temperature effects from the cable force variation. Several thresholds corresponding to different levels of exceedance probability are then obtained to decide four upper criteria and four lower criteria for damage detection. With these criteria, the monitoring data for three stay cables of Ai-Lan Bridge are analyzed and compared to verify the proposed damage detection methodology. The simulated results to consider various damage scenarios unambiguously indicate that the damages with cable force changes larger than +-1.5% can be detected within 12 hours. Even though not exhaustively reflecting the environmental temperature effects on the cable force variation, both the effective temperature and the air temperature can be considered as valid indices to eliminate these effects at high and low monitoring costs. | ||
| Key Words | ||
| cable-stayed bridge; cable force; effective temperature; daily variation; long-term variation; transfer coefficient; damage detection; air temperature | ||
| Address | ||
| Chien-Chou Chen, Wen-Hwa Wu and Gwolong Lai: Department of Construction Engineering, National Yunlin University of Science and Technology, 123 University Road, Touliu, Yunlin 640, Taiwan Chun-Yan Liu: Graduate School of Engineering Science and Technology, National Yunlin University of Science and Technology, 123 University Road, Touliu, Yunlin 640, Taiwan | ||