山区峡谷中桥址处风场特性数值模拟研究  

Numerical Simulation of Wind Field Characteristics at Bridge Sites in Mountain Canyons

作　　者：柯勇 段青松 Ke Yong;Duan Qingsong(Sichuan Highway Planning,Survey,Design and Research Institute Ltd,Chengdu 610041,China;Southwest University of Science and Technology,Mianyang 621010,China)

机构地区：[1]四川省公路规划勘察设计研究院有限公司,四川成都610041 [2]西南科技大学土木工程与建筑学院,四川绵阳621010

出　　处：《科学技术创新》2022年第27期85-88,共4页Scientific and Technological Innovation

基　　金：国家自然基金(51778545)。

摘　　要：为研究某山区峡谷中桥址处风特性,基于大型计算流体动力学软件,建立山区桥址处的复杂地形模型,分析桥面高度的风速放大系数、风攻角及风偏角结果,给出了桥面高度处设计风速取值。结果表明:桥跨两侧风速放大系数比跨中大,靠近右侧桥塔区域,风速放大系数相对较小,这主要与桥塔所处的地形有关。不同测点处的风攻角风攻角变化相对较小,基本在+6°~-8°范围内,风攻角在局部区域较大,最大达25°。北偏西36°~北偏西66°时,在桥塔区域附近,风偏角为负,绝对值最大可达10°;东偏南24°、东偏南54°,在右侧桥塔区域附近,风偏角为负且绝对值最大达50°,综合考虑风速和风攻角的关系,建议在进行桥梁设计时,取正交风,攻角采用±5°。In order to study the wind characteristics of a bridge site in a mountain canyon, a complex terrain model of a bridge site in a mountainous area was established based on large-scale computational fluid dynamics software, and the results of the wind speed amplification factor, wind angle of attack and wind deflection angle of the bridge deck height were analyzed. The design wind speed value at the height of the bridge deck. The results show that the wind speed amplification factor on both sides of the bridge span is larger than that in the middle span, and the wind speed amplification factor is relatively small in the area near the right bridge tower, which is mainly related to the terrain where the bridge tower is located. The variation of the wind angle of attack at different measuring points is relatively small, basically in the range of+6° ~-8°, and the wind angle of attack is larger in local areas, up to 25°. From 36°WN to 66°NW, near the bridge tower area, the wind deflection angle is negative, and the absolute value can be up to 10°;Near the area, the wind deflection angle is negative and the absolute value is up to 50°. Considering the relationship between the wind speed and the wind angle of attack, it is recommended to take the orthogonal wind and ±5° for the angle of attack when designing the bridge.

关 键 词：山区峡谷 风攻角 风偏角 数值模拟 

分 类 号：U448.27[建筑科学—桥梁与隧道工程] U441.3[交通运输工程—道路与铁道工程]