Abstract
Since the monitoring of cable tension are rather susceptible to environmental influence and external loads, the condition assessment of stay cables is vitally difficult because of these uncertainties. In this paper, regarding the health condition of stay cables, a multilevel assessment framework is presented, which can synthetically combined the evaluation results from numerical simulation, field monitoring and visual inspection. Based on these methods, three qualitative and three quantitative indices are selected as the evaluation indices. To reduce the uncertainties during the assessment procedure, an intelligent methodology based on cloud model and Dempster-Shafer (D-S) evidence theory is proposed. With the combination of forward cloud generator and backward cloud generator, the cloud parameters of in-situ data is transmitted to the cloud model of grade criteria, then the cloud evidence with relative weights are fused by Dempster combination, the condition grade of the cable is finally obtained. The Junshan Yangtze River Bridge is adopted to verify the effectiveness of the proposed methodology. The results show that the uncertainty degree can be obviously reduced from 55.7% to 6.7%, so that a scientific evaluation of cable conditions can be obtained. The multilevel assessment framework proposed in this study can serve as an effective basis for cable replacement and maintenance.
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The authors acknowledge the financial support from the National Natural Science Foundation of China (No. 51474048) and the Fundamental Research Funds for the Central Universities (Grant No. N170104024).
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Sun, S., Liang, L. & Li, M. Condition Assessment of Stay Cables via Cloud Evidence Fusion. KSCE J Civ Eng 25, 866–878 (2021). https://doi.org/10.1007/s12205-021-0139-1
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DOI: https://doi.org/10.1007/s12205-021-0139-1