南广线桂平郁江特大桥主桥抗风性能试验研究  

The Experimental Study of Wind- resistant Performance of Main Bridge of the Guiping Yu River Grand Bridge on Nanning- Guangzhou Railway

作　　者：杨平[1] 许志艳[1] 余浪[1] 

机构地区：[1]中铁二院工程集团有限责任公司,成都610031

出　　处：《铁道工程学报》2015年第2期76-81,共6页Journal of Railway Engineering Society

基　　金：中国中铁股份有限公司科研课题<南广铁路桂平郁江钢桁斜拉桥建造技术研究>(重大-11-2010)

摘　　要：研究目的:钢桁斜拉桥具有"跨度大、阻尼低"的特点,桥位一般处于山谷或江河,气象条件比较复杂,抗风性能应重点研究。本文以南广铁路郁江钢桁斜拉桥为工程背景,对其抗风性能进行分析研究及风洞试验,计算该桥的气动参数、动力特性和三分力系数,进行主梁节段模型试验、独塔气动弹性模型试验、施工及成桥全桥气动弹性模型试验和斜拉索雨振节段模型试验,得出有关钢桁斜拉桥抗风性能的一些结论。通过计算分析和风洞试验,研究其风荷载和风致响应特性,为郁江主桥的抗风设计、运营和施工期间的抗风安全和使用舒适性评价提供依据。研究结论:(1)节段模型试验结果表明,郁江桥没有观测到明显的涡激振动现象,颤振稳定性有较大的安全储备;(2)裸塔气弹模型试验结果表明,裸塔结构未发生驰振,也没有发现有影响施工的大振幅涡激振动;(3)全桥模型试验结果表明,郁江桥主梁未发生颤振、横向屈曲、扭转发散等静力失稳现象,也未发现影响施工涡激振动和影响运营的大振幅抖振;(4)斜拉索风雨振动试验结果表明,光滑索阻力较小,但是容易发生风雨振动现象,表面压花及螺旋肋条的斜拉索能够避免风雨振动的发生;(5)本研究结果对铁路钢桁斜拉桥的设计有一定的参考价值。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 isnt 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 arent 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 windrain vi

关 键 词：钢桁梁 斜拉桥 风洞试验 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]