大跨度双幅连续钢箱梁桥涡激振动特性风洞试验研究

Vortex induced vibration performance of long span continuous steel twin box beam bridge based on wind tunnel test

基于崇启大跨度连续梁桥,设计制作大尺度全桥气弹性模型,通过风洞试验对其在均匀流下响应进行研究,确定大跨度双幅钢箱梁连续梁桥涡激振动特性,分析双幅主梁产生两主涡振区机理,模拟外加结构阻尼对涡激振动减振效果。结果可为大跨度双幅钢箱梁连续梁桥抗风设计提供参考。

The long span continuous steel beam bridge,with low damping ratio and flexible structure is apt to produce vortex induced vibration.Based on the Chongqi long span continuous beam bridge,a large scale aeroelastic model of the completed bridge was designed and manufactured.By the wind tunnel test,the vortex induced vibration of the model,under uniform flow,was observed.Besides,the mechanism that leads to two main vortex vibration zones of the separate twin box girder was analyzed.The additional damping was implemented to reduce the vortex induced vibration. The results provide a reference to the wind-resistant design of large span continuous beam bridge.