Zhang Mingjin, Jiang Fanying, Zhang Jingyu, Qin Jingxi, Jiang Xulei, Li Yongle
Department of Bridge Engineering, Southwest Jiaotong University, Chengdu, 610031, China.
Wind Engineering Key Laboratory of Sichuan Province, Southwest Jiaotong University, Chengdu, 610031, China.
Sci Rep. 2022 Sep 19;12(1):15659. doi: 10.1038/s41598-022-19849-3.
The local wind environment above the bridge deck affects the aerodynamic characteristics of vehicles, thus affecting the driving safety of the bridge deck. Influenced by the mountain topography and the bridge deck's ancillary facilities, the local wind environment above the bridge deck is complex and changeable, and its impact on the bridge deck traffic can not be ignored. In order to accurately evaluate the local wind field parameters, a monitoring system of the local wind environment is developed. Utilizing the monitoring system, wind parameters above the approach deck of a long-span suspension bridge in a mountain area are measured. The relationship of wind characteristics between the incoming flow and the wind above the bridge deck is investigated. Results show the significant difference between the local wind environment above the bridge deck and the incoming flow's characteristics; the wind profile above the bridge deck does not follow the exponential distribution; the equivalent height of the wind load on the vehicle is higher than the vehicle's gravity centre. This study is relevant for studying the local wind environment, driving safety, and serviceability of long-span bridges in mountainous areas.
桥面上方的局部风环境会影响车辆的空气动力学特性，进而影响桥面的行车安全。受山地地形和桥面附属设施的影响，桥面上方的局部风环境复杂多变，其对桥面交通的影响不容忽视。为了准确评估局部风场参数，开发了一种局部风环境监测系统。利用该监测系统，对某山区大跨径悬索桥引桥桥面上方的风参数进行了测量。研究了来流与桥面上方风之间的风特性关系。结果表明，桥面上方的局部风环境与来流特性存在显著差异；桥面上方的风剖面不遵循指数分布；车辆上风荷载的等效高度高于车辆重心。本研究对于研究山区大跨径桥梁的局部风环境、行车安全和适用性具有重要意义。
