桥位风场特性研究方法探讨

Discussion on research methods for wind field characteristics at bridge site

在桥梁设计过程中,特别是初步设计阶段,准确获得大跨径桥梁桥位风场特性参数非常重要。本文以临猗黄河特大桥桥位处风场特性研究为背景,采用数值模拟和风场实测方法对风场特性进行研究。结果发现,风场实测位置处10m、30m、50m、80m高度的平均风速分别为2.7m/s、3.4m/s、3.9m/s、4.4m/s,数值模型对应位置处相同高度的风速计算值分别为2.90m/s、3.24m/s、3.55m/s、3.94m/s,误差分别为7.4%、-4.7%、-9.0%、-10.5%,计算结果满足工程需求。对处于复杂地形特别是峡谷谷口的大跨径桥梁,在初步设计阶段通过数值模拟方法获得桥位处风速数据的方法具有可行性。

In the process of bridge design, especially at the preliminary design stage, it is important to accurately obtain the wind field characteristic parameters of the bridge site of long span bridge. With the background of the study on the wind field characteristics at the bridge site of Linyi Bridge, this paper studies the wind field characteristics at the bridge site by numerical simulation and actual measurement. The results show that the average wind speed at the height of 10m,30m, 50m and 80m in the measured position of the wind field is 2.7m/s, 3.4m/s, 3.9m/s and 4.4m/s respectively, and the calculated wind speed at the same height in the corresponding measured position of the wind field in the numerical model is 2.90m/s, 3.24m/s, 3.55m/s, 3.94m/s respectively, and the error is 7.4%,-4.7%,-9.0%,-10.5%, respectively. The calculation results meet the needs of the project. At the preliminary design stage, it is feasible to obtain the wind speed data at the bridge site by numerical simulation method for the long span bridge located in complex terrain, especially at the gorge entrance.