双开槽箱梁断面悬索桥的抗风性能及气动措施研究

发布时间：2018-04-27 02:33

本文选题：双开槽箱梁 + 颤振　；参考：《振动与冲击》2017年10期

【摘要】：为研究双开槽箱梁断面桥梁的抗风性能,并提出合理的颤振和涡振气动控制措施,本文以拟建的某钢箱梁悬索桥为研究对象,开展了一系列节段模型风洞试验,并结合二维三自由度方法和CFD数值模拟分别分析了不同措施下颤振和涡振机理的改变。研究表明:相比于单箱梁断面,双开槽断面能有效的改善颤振性能;防撞栏杆基座的有无,对该类桥的颤振临界风速影响显著;中央稳定板作为改善颤振稳定性的常用手段,对提高双开槽断面颤振临界风速同样适用,且在一定范围内,临界风速与稳定板高度正相关;二维三自由度分析结果显示,中央稳定板和较优形式的栏杆均能减缓气动阻尼随风速的变化趋势。针对开槽引起涡振的问题,尝试采用各种控制措施,试验证明,均匀间隔的纵向格栅能有效的抑制涡振。结合CFD模拟,其根本原因为纵向格栅明显改变了流场绕流特性,阻碍了大规模涡脱的形成。
[Abstract]:In order to study the anti-wind performance of double-slotted box girder cross-section bridges and to put forward reasonable aerodynamic control measures for flutter and vortex vibration, a series of segmental model wind tunnel tests were carried out in this paper, taking a steel box girder suspension bridge as an object of study. The changes of flutter and vortex vibration mechanism under different measures are analyzed by using two-dimensional three-degree-of-freedom method and CFD numerical simulation. The results show that: compared with single box girder section, double slotted section can effectively improve flutter performance, the existence of anti-collision railing base has a significant effect on the flutter critical wind speed of this kind of bridge, and the central stabilizer board is used as a common means to improve flutter stability. It is also applicable to increase the critical flutter velocity of double slotted section, and in a certain range, the critical wind speed is positively correlated with the height of the stabilizing plate, and the results of 2-D three-degree-of-freedom analysis show that, Both the central stabilizing plate and the better type of railing can slow down the trend of aerodynamic damping with wind speed. Aiming at the problem of vortex vibration caused by grooving, various control measures are used. The experiment shows that the longitudinal grid with uniform spacing can effectively suppress the vortex vibration. Combined with CFD simulation, the main reason is that the longitudinal grid obviously changes the flow characteristics around the flow field and hinders the formation of large-scale vortex detachment.
【作者单位】：同济大学土木工程防灾国家重点实验室;
【基金】：土木工程防灾国家重点实验室“973计划”项目(2013CB036301)
【分类号】：U448.25

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