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http://dx.doi.org/10.12989/sem.2016.57.5.951

Experimental investigation on a freestanding bridge tower under wind and wave loads  

Bai, Xiaodong (Ministry-of-Education Key Laboratory of Structural Dynamic Behavior and Control, School of Civil Engineering, Harbin Institute of Technology)
Guo, Anxin (Ministry-of-Education Key Laboratory of Structural Dynamic Behavior and Control, School of Civil Engineering, Harbin Institute of Technology)
Liu, Hao (Ministry-of-Education Key Laboratory of Structural Dynamic Behavior and Control, School of Civil Engineering, Harbin Institute of Technology)
Chen, Wenli (Ministry-of-Education Key Laboratory of Structural Dynamic Behavior and Control, School of Civil Engineering, Harbin Institute of Technology)
Liu, Gao (Bridge Technology Research Center, CCCC Highway Consultants Co., Ltd.)
Liu, Tianchen (Bridge Technology Research Center, CCCC Highway Consultants Co., Ltd.)
Chen, Shangyou (Bridge Technology Research Center, CCCC Highway Consultants Co., Ltd.)
Li, Hui (Ministry-of-Education Key Laboratory of Structural Dynamic Behavior and Control, School of Civil Engineering, Harbin Institute of Technology)
Publication Information
Structural Engineering and Mechanics / v.57, no.5, 2016 , pp. 951-968 More about this Journal
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.
Keywords
freestanding bridge tower; experimental investigation; wind and wave; offshore/coastal structures;
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