高墩连续梁桥风荷载的数值模拟

发布时间：2018-03-28 15:34

本文选题：高墩连续梁桥　切入点：箱梁截面绕流　出处：《西南交通大学》2017年硕士论文

【摘要】：近年来,随着计算机技术和数值方法的发展,计算流体动力学(CFD)在风工程研究领域得到了越来越广泛的应用。本文中采用CFD商业软件Fluent对高墩连续梁桥的三分力系数、静阵风荷载和流场特性进行数值模拟,主要内容包括:(1)本文数值模拟中桥梁模型参考的原型为厄瓜多尔基多市Tramo桥。由于该桥的主梁为变截面梁,因此从中选取较有代表性的跨中截面和墩顶截面进行数值模拟,其截面高度分别为4.0m、7.0m和10.5m,截面宽度均为13.5m。(2)在均匀流中,分别建立截面高度为4.0m、7.0m和10.5m的跨中截面和墩顶截面的二维模型,并考虑风攻角为+3°、0°和-3°的情况,得到了各模型的三分力系数和斯托罗哈数,及其随梁高的变化趋势,并对比分析了不同截面高度和不同风攻角对三分力系数、斯托罗哈数和流场的影响。(3)在均匀流中,以厄瓜多尔的Tramo桥为原型,建立三维足尺模型,对主梁高度为4.0m、7.0m和10.5m的梁段进行单独监测,并考虑风攻角为+3°、0°和-3°的情况,得到了三维模型中跨中截面和墩顶截面的三分力系数,及其随梁高的变化趋势,以及三维流场的分布情况,并和二维数值模拟中得到的结果进行了对比。(4)通过统计分析Tramo桥位处附近的地面气象站提供的风速观测资料,对Tramo桥桥址处风特性进行了数值模拟,研究了桥址处的实际风环境,并计算了桥面高度处、重现期为100年的设计风速。(5)根据得到的设计风速以及前述二维和三维流场中分别得到的阻力系数,计算主梁上的静阵风荷载,并将这两种情况下的计算结果与根据规范得到的静阵风荷载进行了对比。
[Abstract]:In recent years, with the development of computer technology and numerical methods, computational fluid dynamics (CFD) is widely used in wind engineering research field. The three component coefficients by using CFD commercial software Fluent this paper on high pier of continuous girder bridge, numerical simulation of static gust load and flow characteristics, the main contents include: (1) the prototype model reference bridge in this numerical simulation for Ecuador city of Quito Tramo bridge. The bridge is because the main beam of variable cross-section beam, therefore selected from a cross section of the pier top section and numerical simulation of representative, the section height were 4.0m, 7.0m and 10.5m, the width of the cross section are 13.5m. (2) in the uniform flow, established section height 4.0m, two-dimensional model of cross section and pier section of 7.0m and 10.5m, and considering the wind attack angle is +3 degrees, 0 degrees and -3 degrees, the three component and the coefficients of the model Strouhal, change trend and with the high beam, and comparative analysis of different section and different wind attack angle on the impact of the three component coefficients, Strouhal and flow field. (3) in the uniform flow, the Tramo bridge in Ecuador as the prototype, the establishment of three-dimensional full-scale models on the beam height is 4.0m 7.0m, beam and 10.5m separate monitoring, and considering the wind attack angle is +3 degrees, 0 degrees and -3 degrees, the three component coefficients in cross section and pier top section of the three-dimensional model, and its change with Liang Gao, as well as the distribution of three-dimensional flow field, the obtained results have been compared and the two-dimensional numerical simulation. (4) through the statistical analysis of the Tramo bridge is located near the ground meteorological station wind speed observations, the Tramo bridge wind characteristics are investigated by numerical simulation, studied the actual wind environment at the bridge site, the height of the deck and calculation of return period The design wind speed is 100 years. (5) the static gust load on the main girder is calculated based on the obtained design wind speed and the drag coefficient obtained in the two-dimensional and three-dimensional flow field respectively. The calculated results in the two cases are compared with the static gust loads obtained according to the specifications.

【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U441.2

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