山区桥址处风参数风洞试验技术应用  

Application of Wind Tunnel Test Technology for Wind Characteristics at the Bridge Site in Mountainous Terrain

作　　者：裴悦 PEl Yue(Ma'anshan University,Ma'anshan,Anhui 243100,China)

机构地区：[1]马鞍山学院,安徽马鞍山243100

出　　处：《黑龙江交通科技》2025年第4期29-34,共6页Communications Science and Technology Heilongjiang

基　　金：2021年度安徽省省级一流本科专业建设点项目(土木工程教学团队:2021jxtd284)。

摘　　要：根据现行桥梁抗风设计规范建议,通常采用风洞试验来评估桥梁设计中特定场地的风参数。为了探索山区桥址处的风参数规律,在大气边界层风洞中开展了地形模型试验。分析了来流风向和测点位置的对大跨径悬索桥桥址处风参数的影响,包括平均风速、紊流强度和风功率谱。结果表明,在山区地形,来流风向和测点位置对风参数的影响,本质上是地形对风参数的影响;山区桥址处风参数空间分布复杂,与桥梁抗风规范推荐的规律差异明显,均匀风场的假设是不适用的。给出了利用实测风速计算出的紊流强度和风速功率谱,紊流强度具有非单调模式特点;风速功率谱集中在高频区域,与冯卡门模型吻合程度更好。对于山区地形,在桥梁抗风设计时应考虑风参数的可变性。Wind tunnel test is often adopted to assess the site-specific wind characteristics for the wind resistant design of bridges as suggested by current design standards.To investigate the wind characteristics at bridge site in mountainous terrain,a topographic model is tested in an atmospheric boundary layer wind tunnel.The wind characteristics at bridge site of a long span suspension bridge,including the mean wind speed,the turbulence intensity,and the wind power spectra,at bridge site in mountainous terrain,are investigated intensively on the effect of oncoming wind direction and the effect of measurement position.The results indicate that in mountainous terrain,the influence of oncoming wind direction and measurement point location on wind characteristics is essentially the influence of topography on wind characteristics.Due to the complex spatial distribution of wind characteristics,and the difference between the test results and the recommended rules of bridge wind resistance standards is significant,it is indicated that the assumption of a homogenous wind field for the mountainous terrain is not applicable.The calculated turbulence intensities and wind power spectra by using the measured wind speeds are also given.Turbulence intensity has non monotonic mode characteristics.The wind speed power spectrum is concentrated in the high-frequency region,and is more consistent with the Von Karman model.It is shown that for the mountainous terrain,engineers should take into account the variability of the wind characteristics for the bridge wind resistant design considerations.

关 键 词：桥梁工程 风洞试验 山区 非均匀风场 紊流强度 功率谱 

分 类 号：U442.5[建筑科学—桥梁与隧道工程]