大跨度桥梁斜风作用下抖振响应现场实测及风洞试验研究

基于现场实测和全桥气弹模型风洞实验,对大跨度桥梁在斜风作用下的抖振响应进行了研究。在西堠门大桥上安装了GPS位移测量系统和加速度传感器,对桥梁在施工和成桥阶段的风速、风压和抖振响应进行了同步现场实测。然后设计1∶124的全桥气弹模型,进行了该桥在正交风与斜向风作用下的抖振响应风洞试验。对现场实测数据和全桥气弹模型风洞试验结果进行了对比分析,实测数据与风洞实验结果吻合较好。分析结果表明大跨度桥梁在斜风作用下的抖振响应幅值可能达到甚至超过同等风速正交风作用下的响应值。因此,大跨度桥梁抖振响应分析中考虑斜风的作用是非常有必要的。通过对本桥在斜风作用下抖振响应的现场实测和全桥风洞试验结果的研究,得出了一些关于斜风作用下大跨度桥梁抖振响应的有益结论。

Field measurement and wind tunnel test of buffeting response of long-span bridge under skew wind

Buffeting responses of long-span bridge under the acnon ol skew wmct were stumeu based on the field measurement and full aeroelastic model wind tunnel test. The GPS displace ment measurement system and acceleration sensor Were installed on Xihoumen Bridge, the wind speed, wind pressure and buffeting responses of the bridge in construction and completed stage were measured. A 1 ： 124 scale full aeroelastic model was designed to investigate buffeting re- sponses of the bridge under the action of orthogonal wind and skew wind. The field measurement data were compared with the wind tunnel test results. It was found that the sets of results Both are in good agreement; the buffeting response of long-span bridge under the skew wind is likely to achieve, even exceed the response amplitude under the orthogonal wind. Therefore, it is very necessary to consider the influence of skew wind in the analysis of buffeting response of long-span bridge. Some useful conclusions for buffeting response analysis of long span bridge are obtained from this study.