菜园坝长江大桥节段模型风洞试验

随着施工技术以厦新材料的运用，拱桥正朝着刚度小、跨度大、重量轻的方向发展，由于拱桥在施工阶段的刚度显著小于成桥状态，因此研究大跨度拱桥的空气动力特性十分必要．通过菜园坝长江大桥的节段模型静力试验和动力试验获得了主梁及主拱的静力三分力系数随攻角的变化规律、主梁的颤振特性以及识别了主梁的8个颤振导数，并对试验获得的结果进行了详细的分析．最后，对该桥的主梁和拱肋的抗风性能进行了评价．其分析评价的结果直接用于指导该桥的设计与施工，也可为同类桥梁提供理论参考．

Wind Tunnel Test for Section Model of Caiyuanbai Bridge Over Yangtse River

With the development of modern construction technique and the application of new material,arch bridges which progress towards small rigidity,long span and light weight,what's more is that long span bridge's rigidity under construction is much less than that in use stage.So it is very necessary to study the aerodynamic characteristics of long span bridge.The regularity of the three dimensional static component forces coefficient varying with attack angle and the girder's flutter properties of Caiyuanbai Bridge over Yangtse River are investigated with segmental molding's static wind-tunnel test and segmental molding's dynamic wind-tunnel test.Eight derivatives of the girder are also identified from the segmental molding's dynamic wind-tunnel test.Finally the assessment to wind resistant properties of the bridge is given based on detailed analysis of the test results.The conclusion which gets from analysis can provide an suggestion to design and construction this kind bridge.