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Structural Engineering and Mechanics Volume 57, Number 5, March10 2016 , pages 951-968 DOI: https://doi.org/10.12989/sem.2016.57.5.951 |
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Experimental investigation on a freestanding bridge tower under wind and wave loads |
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Xiaodong Bai, Anxin Guo, Hao Liu, Wenli Chen, Gao Liu, Tianchen Liu,Shangyou Chen and Hui Li
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| Abstract | ||
| Long-span cross-strait bridges extending into deep-sea waters are exposed to complex marine environments. During the construction stage, the flexible freestanding bridge towers are more vulnerable to environmental loads imposed by wind and wave loads. This paper presents an experimental investigation on the dynamic responses of a 389-m-high freestanding bridge tower model in a test facility with a wind tunnel and a wave flume. An elastic bridge model with a geometric scale of 1:150 was designed based on Froude similarity and was tested under wind-only, wave-only and wind-wave combined conditions. The dynamic responses obtained from the tests indicate that large deformation under resonant sea states could be a structural challenge. The dominant role of the wind loads and the wave loads change according to the sea states. The joint wind and wave loads have complex effects on the dynamic responses of the structure, depending on the approaching direction angle and the fluid-induced vibration mechanisms of the waves and wind. | ||
| Key Words | ||
| freestanding bridge tower; experimental investigation; wind and wave; offshore/coastal structures | ||
| Address | ||
| Xiaodong Bai, Anxin Guo, Hao Liu and Hui Li: Ministry-of-Education Key Laboratory of Structural Dynamic Behavior and Control, School of Civil Engineering, Harbin Institute of Technology, Harbin, China Tianchen Liu and Shangyou Chen: Bridge Technology Research Center, CCCC Highway Consultants Co., Ltd., Beijing, China | ||