复杂山地风场及角钢输电塔风荷载数值模拟研究

发布时间：2018-01-07 10:03

本文关键词：复杂山地风场及角钢输电塔风荷载数值模拟研究　出处：《合肥工业大学》2017年硕士论文　论文类型：学位论文

【摘要】：数值模拟是掌握山地风场详细信息的有力手段,可以为建筑结构抗风分析提供资料。建筑结构荷载规范已经就典型山体状况的风荷载进行了规定。鉴于复杂山地地形更加多变,复杂地形风场不能依靠典型山体风场的规定进行计算。因此,为进一步加强对复杂地形风场的了解,弥补建筑结构荷载规范的不足,有必要进行复杂地形风场数值模拟。本文首先通过数值模拟获得了平衡大气边界条件,确定了各种场地类型下的风场参数获取方法,接着通过数字高程数据建立三维复杂山地地形模型,利用FLUENT针对湍流求解的雷诺平均法,实现了复杂地形风场的数值模拟,分析了不同类型风场中考虑复杂地形影响后的风速比及风向角变化情况,同时计算得到了不同风向角下研究位置处的风速剖面。研究结果表明,同一种场地下风速比及风向不受入口来流风速的改变影响,不同场地下两者取值不同,其中风速比差别均在12%以上,风向差别更大,达到了40%。通过UG及GAMBIT建模软件建立了窄基角钢输电塔的整体模型,研究了窄基角钢输电塔风荷载体型系数随不同参考风速、来流风向的变化情况,对考虑复杂地形影响后的输电塔风荷载标准值与规范值进行了对比。研究结果表明,体型系数的取值几乎不受来流参考风速的影响,输电塔塔身段顺与垂直线路方向的体型系数随风向角均是先增大后减小,横担体型系数变化基本与塔身变化一致,规范规定的体型系数比模拟值至少小于20%。在某些风向角下,由于地形对风速的加速效应及规范的体型系数取值偏低等问题,复杂地形风场下风荷载标准值比规范取值大接近一倍,此结果对复杂地形输电塔风荷载的确定具有参考价值。
[Abstract]:The numerical simulation is to master the mountain wind field detailed information of the powerful means, can provide the information for wind resistance of building structure analysis. Building structure has been carried out on the provisions of the typical mountain wind load conditions. In view of the complicated terrain more changeable, complex terrain can not rely on the provisions of the typical mountain wind field is calculated. Therefore, for to further strengthen the understanding of complex terrain, compensate for the lack of code for the design of building structures, it is necessary to simulate the complex terrain wind field. This paper has been numerically simulated by equilibrium atmosphere boundary conditions, wind field parameters of various site types were determined under the acquisition method, and then through the digital elevation data to establish a three-dimensional complex terrain model by using the method of FLUENT, the Reynolds averaged turbulence for solving the complex terrain, numerical simulation of wind field, wind field analysis of the different types of senior high school entrance examination The wind speed ratio and considering effect of complex terrain after the wind direction changes, and calculate the velocity profile under different wind angles of position. The results show that changing the effect of one kind of wind speed and wind direction than the ground from the entrance flow velocity, different ground two different values, which are in the different wind speed ratio more than 12% of the wind, the greater the difference reached 40%., establish the overall model of the narrow base angle of transmission tower by UG and GAMBIT software, the narrow base angle of transmission tower wind load shape coefficient with different reference wind speed of change of flow direction, the transmission tower wind load standard value after considering the influence of complex terrain and the standard values were compared. The results show that the shape coefficient is almost not affected by the current wind speed, transmission tower body shape coefficient and vertical wind along the direction of the line to the angle is Increased first and then decreased, crossarm shape coefficient changes consistent with the change of tower body, shape coefficient of specification than analog value at less than 20%. in some wind direction, due to the problem of shape coefficient of low wind speed and acceleration effect of topography on complex terrain specification, wind load standard value than the standard value close to as the results to determine the complex terrain of wind load on transmission tower has reference value.

【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM75

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