Abstract
Empirical single-peak wave spectra have been widely applied in current practice for the stochastic analysis of sea-crossing bridges under random waves. However, single-peak wave spectra may not be appropriate for evaluating the wave responses of bridges located in the nearshore site under tropical cyclones. In this study, typhoon wave spectra at an actual bridge site were measured and analyzed during Typhoon Dujuan in 2015. The stochastic structural responses of an example sea-crossing cable-stayed bridge under random waves were assessed by employing measured and empirical wave spectra. A frequency-domain approach was developed and validated with time-domain results as an efficient alternative for structural response analysis. The effect of wave directionality on the structural response was investigated and discussed as well. The main conclusions are: (1) the measured wave spectrum at the bridge site presents a double-peak shape and can be well described by the Ochi-Hubble spectrum; (2) the empirical Joint North Sea Wave Project (JONSWAP) spectrum may overestimate the internal force responses of the bridge towers and underestimate the displacement responses of the midspan; (3) the incident wave direction has remarkable impacts on the structural responses of the sea-crossing bridge and requires careful investigation; and (4) the proposed frequency-domain approach is an efficient as well as an accurate alternative for the long-duration evaluation of bridge responses.
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Acknowledgments
This work was supported financially by the National Natural Science Foundation of China (Grant Nos. 51708455 and 51525804) and the Fundamental Research Fund for Central Universities (A1920502051907-2-001).
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Information & Authors
Information
Published In
Journal of Bridge Engineering
Volume 25 • Issue 1 • January 2020
Copyright
©2019 American Society of Civil Engineers.
History
Received: Feb 1, 2019
Accepted: Aug 22, 2019
Published online: Oct 25, 2019
Published in print: Jan 1, 2020
Discussion open until: Mar 25, 2020
ASCE Technical Topics:
- Analysis (by type)
- Bridge engineering
- Bridge tests
- Bridges
- Bridges (by type)
- Climates
- Disaster risk management
- Disasters and hazards
- Engineering fundamentals
- Environmental engineering
- Field tests
- Fluid mechanics
- Frequency analysis
- Hurricanes, typhoons, and cyclones
- Hydrologic engineering
- Mathematics
- Measurement (by type)
- Natural disasters
- Probability
- Random waves
- Span bridges
- Stochastic processes
- Structural engineering
- Tests (by type)
- Tropical regions
- Water and water resources
- Wave measurement
- Wave spectrum
- Waves (fluid mechanics)
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