山区峡谷风特性的数值模拟与现场实测的对比研究
发布时间：2018-08-14 12:39
【摘要】：随着桥梁技术的发展，跨越复杂地形的大跨度桥梁不断涌现，受到复杂地形的干扰，抗风设计规范均已不再适用。本文基于湖南省矮寨大桥桥址区的峡谷地形为工程背景，采用现场实测和数值模拟相结合的方法，研究山区峡谷平均风速特性，总结峡谷平均风场特性变化规律。主要研究内容包括： （1）基于MATLAB软件编程功能，对矮寨大桥桥位区现场实测数据进行了读取与数值处理；推导了三维风速传感器的风轴坐标转换；分析了两次强风记录的平均风特性，如瞬时风速、脉动风速、10分钟平均风速、风玫瑰图、风攻角等参数。 （2）采用国家科学数据服务平台获取了桥位附近较大范围内的地形高程数据，，借助Global Mapper和Civil3D进行数据传递，获得桥位地形高程点云；利用逆向工程软件NX Imageware的曲面拟合功能拟合桥位地形曲面；根据六面体网格划分方法，减小了网格的数量及计算的时间；编写了UDF边界输入程序，进行了八个不同来流风向的工况分析。 通过两次强风实测记录与数值模拟的风剖面指数对比，验证了本文的数值模拟是一种建模方便、精度较高的方法。同时证明了峡谷风的来流风向不同，峡谷风特性的地表粗糙系数、风攻角以及沿桥轴向的风速分布等参数明显不同。
[Abstract]:With the development of bridge technology, long-span bridges spanning complex terrain are emerging constantly, and the wind resistant design code is no longer applicable to the disturbance of complex terrain. Based on the engineering background of the canyon topography in the bridge area of the Paizhai Bridge in Hunan Province, this paper studies the characteristics of the mean wind speed in mountain canyons and summarizes the variation law of the average wind field characteristics of the canyons by using the method of field measurement and numerical simulation. The main research contents are as follows: (1) based on the programming function of MATLAB software, the field measured data in the bridge area of Aizhai Bridge are read and processed, and the coordinate transformation of the wind axis of the three-dimensional wind speed sensor is deduced. The average wind characteristics of two strong wind records are analyzed, such as instantaneous wind speed, pulsating wind speed, 10-minute mean wind speed, wind rose chart. (2) using the national scientific data service platform to obtain the topographic elevation data in a large area near the bridge, and to transfer the data by means of Global Mapper and Civil3D to obtain the topographic elevation point cloud of the bridge position; The surface fitting function of reverse engineering software NX Imageware is used to fit the topographic surface of bridge position. According to the method of hexahedron mesh generation, the number of meshes and the time of calculation are reduced, and the UDF boundary input program is written. The operating conditions of eight different flow directions are analyzed. The comparison of wind profile exponents between the measured records of two strong winds and the numerical simulation shows that the numerical simulation in this paper is a convenient and accurate method. It is also proved that the surface roughness coefficient, wind attack angle and wind velocity distribution along the bridge axis of canyon wind are different.
【学位授予单位】：湖南科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U442.59
[Abstract]:With the development of bridge technology, long-span bridges spanning complex terrain are emerging constantly, and the wind resistant design code is no longer applicable to the disturbance of complex terrain. Based on the engineering background of the canyon topography in the bridge area of the Paizhai Bridge in Hunan Province, this paper studies the characteristics of the mean wind speed in mountain canyons and summarizes the variation law of the average wind field characteristics of the canyons by using the method of field measurement and numerical simulation. The main research contents are as follows: (1) based on the programming function of MATLAB software, the field measured data in the bridge area of Aizhai Bridge are read and processed, and the coordinate transformation of the wind axis of the three-dimensional wind speed sensor is deduced. The average wind characteristics of two strong wind records are analyzed, such as instantaneous wind speed, pulsating wind speed, 10-minute mean wind speed, wind rose chart. (2) using the national scientific data service platform to obtain the topographic elevation data in a large area near the bridge, and to transfer the data by means of Global Mapper and Civil3D to obtain the topographic elevation point cloud of the bridge position; The surface fitting function of reverse engineering software NX Imageware is used to fit the topographic surface of bridge position. According to the method of hexahedron mesh generation, the number of meshes and the time of calculation are reduced, and the UDF boundary input program is written. The operating conditions of eight different flow directions are analyzed. The comparison of wind profile exponents between the measured records of two strong winds and the numerical simulation shows that the numerical simulation in this paper is a convenient and accurate method. It is also proved that the surface roughness coefficient, wind attack angle and wind velocity distribution along the bridge axis of canyon wind are different.
【学位授予单位】：湖南科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U442.59
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