[1]李加武,王路,霍五星.梁间距对双层钢箱梁涡振特性的影响[J].长安大学学报(自然科学版),2022,42(2):43-55.
　LI Jia wu,WANG Lu,HUO Wu xing.Influence of deck spacings on vortexinduced vibration characteristics ofdoublelayer decks with steel box girders[J].Journal of Chang’an University (Natural Science Edition),2022,42(2):43-55.
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梁间距对双层钢箱梁涡振特性的影响()
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长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

卷:
第42卷
期数:
2022年2期
页码:
43-55
栏目:
桥梁与隧道工程
出版日期:
2022-03-15

文章信息/Info

Title:
Influence of deck spacings on vortexinduced vibration characteristics ofdoublelayer decks with steel box girders
作者:
李加武; 王路; 霍五星
1. 长安大学 公路学院，陕西 西安 710064； 2. 长安大学 风洞实验室，陕西 西安 710064；3. 中建丝路建设投资有限公司，陕西 西安 710075
Author(s):
LI Jiawu;  WANG Lu;  HUO Wuxing
1. School of Highway, Changan University, Xian 710064, Shaanxi, China; 2. Wind Tunnel Laboratory,Changan University, Xian 710064, Shaanxi, China; 3. China Construction Silk Road ConstructionInvestment Co., Ltd., Xian 710075, Shaanxi, China
关键词:
桥梁工程; 双层钢箱梁; 涡振; 风洞试验; 计算流体力学; SST kω湍流模型; 梁间距; 风攻角
Keywords:
bridge engineering; doublelayer decks with steel box girders;  vortexinduced vibration;  wind tunnel test;  CFD;  SST kω turbulence model;  deck spacing;  wind attack angle
文献标志码:
A
摘要:
为了研究梁间距对双层钢箱梁涡振特性的影响，设计了6类试验组合，共31种试验工况，通过节段模型测振风洞试验，测得各个工况单层和双层钢箱梁的量纲一化涡振振幅，分析了在不同来流风攻角时，梁间距对双层钢箱梁涡振特性的影响，并与单层钢箱梁的试验结果进行对比，研究其变化趋势；在双层钢箱梁的计算流体力学（CFD）分析过程中，选用了对钝体扰流模拟效果好的SST kω湍流模型，模拟了不同梁间距下双层钢箱梁的周边流场，分析了双层钢箱梁断面的周边绕流特性，并结合瞬态速度流线图和压力云图探讨了不同梁间距和风攻角的双层钢箱梁涡振特性的机理。结果表明：梁间距对双层钢箱梁涡振特性的影响与风动试验来流风攻角有关，在0°风攻角时，梁间距越大，双层钢箱梁涡振振幅越小；双层钢箱梁正风攻角的竖弯涡振，存在1个最优的梁间距，而部分风攻角的扭转涡振，也存在1个最优的梁间距；在负风攻角时，没有发现明显的涡振现象，其涡振特性较好。CFD计算分析表明：梁间距越大，上、下层梁周边绕流相互扰动越小，随着梁间距的增大，上层梁后缘斜腹板处气流越不易分离，前缘再附点越靠前；随着风攻角从正变负，双层钢箱梁上层梁上表面前缘绕流分离现象受到抑制，气流在上层梁上表面前缘发生的不同流动分离现象，是此类钢箱梁涡振特性在不同风攻角下表现出差异的主要原因之一。
Abstract:
In order to study the influence of deck spacings on the vortex vibration characteristics of doublelayer decks with steel box girders, 6 types of test combinations which contain 31 load cases were carried out. Through the segment model vibration measurement wind tunnel test, the dimensionless vortexinduced vibration amplitude of various load cases of the singlelayer deck with steel box girder and the doublelayer decks with steel box girder were tested. And the influence of the distance on the vortexinduced vibration characteristics of the doublelayer decks with steel box girder at different inflow wind attack was analyzed, and compared with the results of singlelayer deck with steel box girder, then the law of change was studied. In the computational fluid dynamics (CFD) analysis process of doublelayer decks with steel box girder, the SST kω turbulence mode which has good effect on bluff body, was chosen to numerically simulate the flow field of the doublelayer decks with steel box girder under different deck spacings. The flow characteristics around the section of the doublelayer decks with steel box girder were analyzed, and combined transient velocity streamline diagram and pressure contour, the vortexinduced vibration mechanism of the doublelayer decks with steel box girder section with different deck spacings and wind attack angles was discussed. The results show that the influence of the vortexinduced vibration characteristics of doublelayer decks with steel box girder with different deck spacings is related to the wind tunnel test inflow wind attack angles. At 0° wind attack angle, the larger the deck spacing, the smaller the vortexinduced vibration amplitude of the doublelayer decks with steel box girder. At the positive wind attack angle, there is an optimal deck spacing for vertical bending vortexinduced vibration, and for torsional vortexinduced vibration, there is also an optimal deck spacing for some wind attack angles. At the negative wind attack angle, there is no obvious vortexinduced vibration of doublelayer decks with steel box girder. CFD calculation analysis shows that the larger the deck spacing, the smaller the mutual disturbance of the flow around the upper and lower decks. Its mainly manifested in, as the increase of the deck spacing, the flow at the oblique web at the rear edge of the upper deck is more difficult to separate, and the position of the reattachment point is more forward. With the wind attack angles change from positive to negative, the phenomenon of the flow separation on the front edge of the upper deck surface of the doublelayer decks with steel box girder is suppressed, which is one of the main reasons why the vortexinduced vibration characteristics of this type steel box girder show differences under different wind attack angles. 3 tabs, 13 figs, 39 refs.

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更新日期/Last Update: 2022-04-13