Bridge Performance Warning Based on Two-Stage Elimination of Environment-Induced Frequency
Publication: Journal of Performance of Constructed Facilities
Volume 36, Issue 6
Abstract
Bridge modal frequency is an important parameter reflecting its overall property change and widely used for bridge condition assessment. However, the effects of multiple environmental conditions on the modal frequency will mask the variation induced by structural damage. Traditional single regression models cannot quantify measurable and unmeasurable environmental effects simultaneously, resulting in poor prediction and separation performance. Therefore, a two-stage elimination model (TSEM) integrating regression analysis and trend decomposition technique was developed. Environmental principal components (PCs) sensitive to the single-order modal frequency were extracted based on partial least-squares analysis. To quantify the nonlinear effects of measurable environmental factors, the baseline predictor with respect to modal frequency and environmental PCs was constructed through relevance vector machine technology. An error compensation model based on singular spectrum analysis was established to extract trend-related components and remove the part of residual modal variability unknot considered by the baseline model. On this basis, exponential weighted moving average control chart was established to highlight slight abnormal changes in modal frequency. A cable-stayed bridge case verified its validity and accuracy. The results indicate that the proposed TSEM has better modeling, generalization, and separation performance than the baseline model, and the variation of normalized frequency tends to be more stable. Additionally, the significant differences of damage sensitivity of different orders were determined.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
This research work was jointly supported by the National Natural Science Foundation of China (Grant Nos. 51978128 and 52078102), and the Fundamental Research Funds for the Central Universities (Grant No. DUT22ZD213).
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© 2022 American Society of Civil Engineers.
History
Received: Nov 11, 2021
Accepted: Jun 2, 2022
Published online: Sep 10, 2022
Published in print: Dec 1, 2022
Discussion open until: Feb 10, 2023
ASCE Technical Topics:
- Analysis (by type)
- Bridge engineering
- Bridge tests
- Bridges
- Bridges (by type)
- Cable stayed bridges
- Cables
- Continuum mechanics
- Dynamics (solid mechanics)
- Engineering fundamentals
- Engineering mechanics
- Equipment and machinery
- Errors (statistics)
- Field tests
- Mathematics
- Modal analysis
- Motion (dynamics)
- Natural frequency
- Oscillations
- Parameters (statistics)
- Regression analysis
- Solid mechanics
- Statistical analysis (by type)
- Statistics
- Structural engineering
- Tests (by type)
Authors
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