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Influence of deck spacings on vortexinduced vibration characteristics ofdoublelayer decks with steel box girders(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2022年2期
Page:
43-55
Research Field:
桥梁与隧道工程
Publishing date:

Info

Title:
Influence of deck spacings on vortexinduced vibration characteristics ofdoublelayer decks with steel box girders
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
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
PACS:
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DOI:
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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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Last Update: 2022-04-13