菜园坝长江大桥气动弹性模型风洞试验及分析

介绍了重庆菜园坝长江大桥施工及成桥状态全桥气动弹性模型在均匀流和湍流两种流场中的风洞试验的主要内容及相应结果。评估了菜园坝长江大桥颤振、抖振和涡激振动等风振特性。结果表明,该桥成桥状态下的各种风振响应能满足设计风速下的抗风要求。主拱悬臂施工状态下主拱振幅最大,主拱1/4悬臂状态下有涡激振动现象。

Wind Tunnel Tests and Analysis of Aeroelastic Model of Caiyuanba Changjiang River Bridge

This paper presents the main contents and relevant outcomes of wind tunnel tests for aeroelastic model of overall bridge of Caiyuanba Changjiang River Bridge,Chongqing in both construction and completion states respectively in the smooth and turbulent flow fields.The wind-induced vibration behavior of the Bridge,such as that of fluttering,buffeting and vortex-(excited) vibration,is investigated and evaluated.The results show that all the vibration responses on the Bridge in the completion state can meet the wind-resistant expectations in the design wind speed.The vibration amplitude of the main arch in the maximum cantilever construction state of the arch is the greatest, and the vortex-excited vibration takes place at the 1/4 cantilever of the arch.