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用计算流体力学(CFD)方法模拟了双箱梁周围的风场绕流特性,不仅得到流场的压力、速度和涡旋的分布,还计算了箱梁截面的体型系数、挡风折减系数。对不同尺度的箱梁结构进行数值模拟分析,得出体型系数变化规律,并将数值模拟结果与国内外研究结果对比,分离箱梁的气动减阻优势使其与《规范》中单梁相比体型系数较小。由于涡流的影响,使后梁所受载荷转向,挡风折减系数出现一零点值。
The CFD method was used to simulate the flow field around the double box girder, which not only got the pressure, velocity and vortex distribution in the flow field, but also calculated the body coefficient of box girder section, the windshield reduction coefficient . The numerical simulation of box girder structures with different scales was carried out, and the change rule of body shape coefficient was obtained. The numerical simulation results were compared with those of the domestic and foreign research results. The aerodynamic drag reduction of the box girder separated from the single girder Body size coefficient is smaller. Due to the influence of eddy current, the load on the back beam is turned, and the windshield reduction factor shows a value of zero.