起伏地形对高速公路桥梁段区域风场影响的研究

发布时间：2018-01-12 02:20

本文关键词：起伏地形对高速公路桥梁段区域风场影响的研究　出处：《北京交通大学》2014年硕士论文　论文类型：学位论文

【摘要】：本文研究内容属于国家自然科学基金项目——“高速公路建设对区域气流场影响的研究”(51178033)的一部分。随着交通事业的高速发展和西部大开发战略的实施,山区高速公路的建设日益增多。由于山区地形较为复杂,很多区段都会架设高速公路桥梁段,以达到跨越不同的地形地貌、实现地区间交互联通的效果。目前,桥梁风工程的研究主要集中在风荷载计算、抗风设计、平坦地形条件下桥梁区域风场的数值模拟等方面,对于起伏地形条件下高速公路桥梁段区域风场的研究目前还不太成熟。因此,通过理论分析及数值模拟,探究起伏地形变化对高速公路桥梁段区域风场的影响是很有意义的。本文以计算流体动力学基本理论为基础,利用CFD软件Fluent,对不同起伏地形条件下,高速公路桥梁段区域风场进行数值模拟,主要研究内容有： 1.对迎风侧起伏地形条件下高速公路桥梁段区域风场进行数值模拟。改变起伏地形的高度、起伏地形与桥梁之间的距离、起伏地形的数量等参数,对比分析不同工况时风场的分布,探讨迎风侧起伏地形的变化对高速公路桥梁段区域风场的影响。 2.对背风侧起伏地形条件下高速公路桥梁段区域风场进行数值模拟。改变起伏地形的高度、起伏地形与桥梁之间的距离、起伏地形的数量等参数,对比分析不同工况时风场的分布,探讨背风侧起伏地形的变化对高速公路桥梁段区域风场的影响。 3.对两侧起伏地形条件下高速公路桥梁段区域风场进行数值模拟。改变起伏地形的高度、起伏地形与桥梁之间的距离、起伏地形的数量等参数,对比分析不同工况时风场的分布,探讨两侧起伏地形的变化对高速公路桥梁段区域风场的影响；将平坦地形、迎风侧、背风侧,两侧起伏地形四种工况数值计算结果对比分析,探讨不同类型起伏地形条件下,高速公路桥梁段区域风场的分布规律。 4.对本文的研究结果进行分析总结,提出需要进一步开展的研究工作。
[Abstract]:The research content of this paper belongs to the National Natural Science Foundation of China-"the study of the influence of highway construction on regional airflow field" (51178033). With the rapid development of transportation and the implementation of the western development strategy. The construction of mountain highway is increasing day by day. Because the terrain of mountain area is more complex, many sections will set up highway bridge section to reach the effect of crossing different terrain and geomorphology and realizing the mutual connection between regions. At present. The research of bridge wind engineering mainly focuses on wind load calculation, wind resistance design, and numerical simulation of wind field in bridge area under flat terrain. The study of wind field in highway bridge section under undulating terrain is not very mature at present. Therefore, through theoretical analysis and numerical simulation. It is significant to explore the influence of undulating topography on the wind field in highway bridge section. Based on the basic theory of computational fluid dynamics (CFD), the wind field in highway bridge section is numerically simulated by using CFD software Fluent. under different undulating terrain conditions. The main research contents are as follows: 1. Numerical simulation of wind field in bridge section of expressway under upwind side undulating terrain, changing the height of undulating terrain, distance between undulating terrain and bridge, quantity of undulating terrain and so on. The distribution of wind field in different working conditions is analyzed, and the influence of upwind side undulating topography on the wind field in bridge section of expressway is discussed. 2. Numerical simulation of wind field in the bridge section of expressway under the condition of leeward side undulating terrain, changing the height of undulating terrain, the distance between undulating terrain and bridge, the quantity of undulating terrain and so on. The distribution of wind field in different working conditions is analyzed, and the influence of the variation of leeward side undulating topography on the wind field in bridge section of expressway is discussed. 3. Numerical simulation of the wind field in the bridge section of expressway under the condition of undulating terrain on both sides, changing the height of the undulating terrain, the distance between the undulating terrain and the bridge, the quantity of undulating terrain and so on. The distribution of wind field under different working conditions is analyzed, and the influence of the undulating terrain on the wind field in the bridge section of expressway is discussed. In this paper, the numerical results of flat terrain, upwind side, leeward side and undulating terrain on both sides are compared and analyzed, and the distribution of wind field in highway bridge section under different types of undulating terrain is discussed. 4. The research results of this paper are analyzed and summarized, and the further research work is put forward.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U442.59

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