大跨度桥梁近距离拉索风载作用的数值模拟
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摘要
为了研究大跨度桥梁中近距离并列拉索在脉动风场下的响应,建立桥梁并列拉索三维实体数值模型,采用MATLAB软件模拟随机脉动风场并导入流体力学计算软件Fluent中,选择计算精度较高的重整化群组理论(RNG)k-ε湍流模型作为计算模型,对近距离并列拉索的3种不同高度处风压分布和风速分布进行数值分析。结果表明:风压力随着高度的增加而增大,在上游拉索前端正压力最大,两侧负压力最大;最大风速出现在两索之间,在下游拉索后端不断减小,随着高度的不同,风速变化呈现规律性;在上游拉索和下游拉索之间区域的风速出现紊乱现象,主要原因是拉索距离较近,两索之间相互影响效应比较明显。
To study the response of close-range cables in parallel under a fluctuating wind field in a long-span bridge, a three-dimensional physical model of a bridge parallel cable was established. Using MATLAB software to simulate the stochastic fluctuating wind field and importing it into fluid mechanics software Fluent, the re-normalization group(RNG) k-ε turbulence model with high calculation accuracy was selected as the calculation model, the close-range cables in para-llel under the wind pressure distribution and the wind speed distribution at three heights were numerically analyzed. The results show that the wind pressure increases with height. In the upstream cable, the maximum positive pressure is at the front of the advanced cable and the maximum negative pressure is at both sides. The maximum wind speed occurs between the two cables, and at the back end of the downstream cable decreases continuously. The variation of wind speed is regular with the change of height. The disturbance of the wind speed occurs in the area between the upstream cable and the downstream cable, the main reason is the close distance of the cables and the obvious mutual influence between the two cables.
To study the response of close-range cables in parallel under a fluctuating wind field in a long-span bridge, a three-dimensional physical model of a bridge parallel cable was established. Using MATLAB software to simulate the stochastic fluctuating wind field and importing it into fluid mechanics software Fluent, the re-normalization group(RNG) k-ε turbulence model with high calculation accuracy was selected as the calculation model, the close-range cables in para-llel under the wind pressure distribution and the wind speed distribution at three heights were numerically analyzed. The results show that the wind pressure increases with height. In the upstream cable, the maximum positive pressure is at the front of the advanced cable and the maximum negative pressure is at both sides. The maximum wind speed occurs between the two cables, and at the back end of the downstream cable decreases continuously. The variation of wind speed is regular with the change of height. The disturbance of the wind speed occurs in the area between the upstream cable and the downstream cable, the main reason is the close distance of the cables and the obvious mutual influence between the two cables.
引文
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[10] AFUNGCHUI D, KAMOUN B, HELALI A. Vortical structures in the wake of the savonius wind turbine by the discrete vortex method[J]. Renewable Energy, 2014, 69(3):174-179.
[11] ZHANG J, DALTON C. A three-dimensional simulation of a steady approach flow past a circular cylinder at low Reynolds number[J]. International Journal for Numerical Methods in Fluids, 2015, 26(9): 1003-1022.
[2] 李胜利, 路毓, 王东炜. 悬索桥骑跨式吊索驰振气动干扰效应数值分析[J]. 公路交通科技, 2015, 32(3):82-88.
[3] LI Y L, WU M X, CHEN X Z, et al. Wind-tunnel study of wake galloping of parallel cables on cable-stayed bridges and its suppress-ion[J]. Wind and Structures, 2013, 16(3):249-261.
[4] THAPA J, ZHAO M, CHENG L, et al. Three-dimensional simulations of flow past two circular cylinders in side-by-side arrangements at right and oblique attacks[J]. Journal of Fluids & Structures, 2015, 55:64-83.
[5] ALAM M M, MEYER J P. Global aerodynamic instability of twin cylinders in cross flow[J]. Journal of Fluids & Structures, 2013, 41(8):135-145.
[6] 邹琳, 汪秒, 郭丛波, 等. 低雷诺数下并列双波浪柱尾迹干扰效应数值模拟[J]. 水动力学研究与进展, 2016, 31(5): 599-607.
[7] 张大可, 赵西增, 胡子俊, 等. 低雷诺数下串列双圆柱涡激振动的数值模拟[J]. 哈尔滨工程大学学报, 2018, 39(2): 247-253.
[8] 杨吉新, 黎建华, 余越, 等. 考虑流固耦合CFRP拉索风雨激振数值模拟[J]. 武汉理工大学学报(交通科学与工程版), 2017, 41(3): 443-447.
[9] 杜晓庆, 张利平, 刘庆宽. 缆索承重桥近距离并列索气动力的雷诺数效应[J]. 重庆交通大学学报(自然科学版), 2016, 35(6): 1-5.
[10] AFUNGCHUI D, KAMOUN B, HELALI A. Vortical structures in the wake of the savonius wind turbine by the discrete vortex method[J]. Renewable Energy, 2014, 69(3):174-179.
[11] ZHANG J, DALTON C. A three-dimensional simulation of a steady approach flow past a circular cylinder at low Reynolds number[J]. International Journal for Numerical Methods in Fluids, 2015, 26(9): 1003-1022.