南广线桂平郁江特大桥主桥抗风性能试验研究

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Abstract Abstract：Research purposes： The truss cable-stayed bridge has the characteristics of large span and low damping. The bridge is located in the valley or river and meteorological condition is more complex.The wind resistance performance should be researched in focused way. The wind tunnel test and analytical study were made for the wind-resistant performance for truss cable-stayed bridge of Yu River on Nanning-Guangzhou Railway. The aerodynamic parameter, the dynamic characteristics and the three component coefficients were calculated. The main girder sectional model test, the aeroelastic model test for the tower and bridge of construction and operation, the stay cable rain vibration test were included. The conclusions have been drawn for the wind-resistant performance of truss cable-stayed bridge. The characteristics of wind load and wind-induced response are researched to provide the basis for wind resistant design of main bridge, the wind resistance safety and comfort evaluation during the operation and construction.
Research conclusions：（1）The result of sectional model test shows that the vortex-induced vibration phenomenon isn't observed obviously, the emergency capacity of velocity of vibration stability is enough.（2）The result of tower aeroelastic model test shows that the galloping phenomenon of the tower doesn't happen, and the large amplitude of the vortex-induced vibration isn't observed on construction.（3）The result of bridge aeroelastic model test shows that the static destabilization phenomenon of velocity, transverse flection, torsion disperse doesn't happened in the girder of Yu River bridge. The vortex-induced vibration phenomenon on construction and the large amplitude of the wind-induced buffet on operation aren't discovered. （4）The result of stay cable rain vibration test shows that the resistance of slippery cable is less than other type cable but wind-rain vibration is easy to happen. The empaistic or whorled cable can avoid the occurrence of wind-rain vibration.（5）The reseatch result has a certain reference value for the truss railway cable-stayed bridge design.

Key words： Key words: truss girder bridge cable-stayed bridge wind tunnel test

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http://tdgcxb.crec.cn/EN/ OR http://tdgcxb.crec.cn/EN/Y2015/V32/I2/76

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