半开口分离双箱梁涡振性能及其气动控制措施研究

发布时间：2018-05-12 15:15

本文选题：半开口分离双箱梁 + 涡激振动　；参考：《土木工程学报》2017年03期

【摘要】：基于某主跨820m混合梁斜拉桥,利用刚体节段模型风洞试验结合计算流体动力学(CFD)数值模拟,系统研究了半开口分离双箱梁的涡振性能并进行一系列气动控制措施的探讨。该断面成桥状态在+3°或+5°风攻角下会产生大幅竖弯涡振,来流上游侧检修道栏杆处的气流分离起主导作用,检修车轨道对竖弯涡振有放大作用,这主要源于其后方连续产生的小尺度漩涡在断面下部开口内汇聚,形成了能量集中的大尺度漩涡。采用不同形式的检修道栏杆或改变风嘴角度对竖弯涡振控制效果不理想,将风嘴向外延伸可以有效降低振幅,但要保证检修道栏杆不移动,工程实用性较差。下中央稳定板基本没有抑制效果;水平翼板和抑流板都能有效控制竖弯涡振,其中水平翼板可以延缓漩涡能量的集中降低涡振振幅,但不能完全抑制振动,而且大攻角下会延长涡振风速区间;抑流板则直接通过抑制断面上表面漩涡的形成而有效控制涡振发生。
[Abstract]:Based on a cable-stayed bridge with 820m main span hybrid beam, the vortex vibration performance of a semi-open separated double box girder is systematically studied by using a rigid segment model wind tunnel test combined with the numerical simulation of computational fluid dynamics (CFD), and a series of aerodynamic control measures are discussed. Under the condition of 3 掳or 5 掳wind attack, the cross-section will produce large vertical bending vortex vibration, and the flow separation at the railing of the overhauling track on the upstream side of the incoming flow will play a leading role, and the vehicle repair track will amplify the vertical bending vortex vibration. This is mainly due to the small scale vortex which is produced continuously behind the cross section and converges in the opening of the lower section, forming a large scale swirl of energy concentration. It is not ideal to control the vertical bending vortex vibration by adopting different forms of overhaul rail or changing the angle of the wind nozzle. The amplitude can be effectively reduced by extending the wind nozzle outward, but the engineering practicability is poor to ensure that the railing of the overhaul track does not move. The horizontal flange and flow suppression plate can effectively control the vertical bending vortex vibration, in which the horizontal wing plate can delay the concentration of vortex energy and reduce the amplitude of vortex vibration, but it can not completely suppress the vibration. Moreover, the wind speed range of vortex vibration will be prolonged at high angle of attack, and the vortex vibration can be effectively controlled by suppressing the formation of vortex on the surface of the section directly.
【作者单位】：同济大学土木工程防灾国家重点实验室;
【基金】：科技部国家重点基础研究973计划(2013CB036300) 国家自然科学基金重点项目(51323013) 国家重点实验室自主课题(SLDRCE 10-B-05)
【分类号】：U441.3

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