Effect of Projecting Slab Length on Flutter Stability of Steel Truss Girder

被引：0
|
作者：
Dong G. [1 ]
Xu Y. [1 ]
Han Y. [1 ]
Li K. [1 ]
Li C. [1 ]
Cai C. [1 ,2 ]
机构：
[1] Hunan Province Engineering Laboratory for Bridge Structure Safety Control, Changsha University of Science & Technology, Changsha
[2] School of Transportation, Southeast University, Nanjing
来源：
Hunan Daxue Xuebao/Journal of Hunan University Natural Sciences | 2023年 / 50卷 / 03期
基金：
中国国家自然科学基金;
关键词：
flutter stability; numerical simulation; projecting slab; steel truss girder;
D O I：
10.16339/j.cnki.hdxbzkb.2023037
中图分类号：
学科分类号：
摘要：
Based on the numerical simulation method，the influence of projecting slab length on flutter stability of steel truss girder suspension bridge is studied. The flutter stability of the initial design girder（projecting slab length L is 0.947 m）at different attack angles for the originally designed section of some suspension bridge steel truss girder was tested by wind tunnel test，and the results were compared with that of CFD to verify the reliability of the numerical method. Based on the study on the input energy value of aerodynamic force in a single period and the evolution of flow field under the same reduced wind speed，the influence of projecting slab length（0.0L，0.5L，1.0L，and 1.5L）on the flutter stability of steel truss girder is obtained. The results show that the influence of projecting slab length on the flutter stability of steel truss girder is not obvious at the positive attack angle，but the flutter stability of steel truss girder with a 1.5L projecting slab is significantly better than other conditions at 0° and negative attack angle. The change of pressure caused by the movement of the vortices on the upper surface and the change of the pressure on the windward side of the lower surface at 0°attack angle become the dominant factors of the aerodynamic force. The direction of the aerodynamic force is consistent with that of the steel truss girder，which promotes the divergence of torsional vibration. However，increasing the length of the projecting slab weakens the scale of the vortices on the upper surface，and forms a relatively stable pressure region at the projecting slab. There is no obvious vortex on the upper surface at negative attack angle steel truss，and the evolution of vortices on the lower surface and pressure change become the dominant factors of flutter divergence. Increasing the cantilever arm can weaken the scale and intensity of the vortex on the lower surface，and continuously form a stable negative pressure zone on the lower surface of the windward cantilever arm. The energy input of aerodynamic force is negative. © 2023 Hunan University. All rights reserved.
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页码：132 / 142
页数：10
相关论文
共 24 条
  • [1] WANG K, LIAO H L, LI M S．, Flutter suppression of long-span suspension bridge with truss girder［J］, Wind and Structures, 23, 5, pp. 405-420, (2016)
  • [2] CAI C S．, Study of central buckle effects on flutter of long-span suspension bridges, Wind and Structures, 31, 5, (2020)
  • [3] KWON S D, CHANG S P，, KIM Y S, Aerodynamic stability of self-anchored double deck suspension bridge, Journal of Wind Engineering and Industrial Aerodynamics, 54, 55, pp. 25-34, (1995)
  • [4] SETAREH M．, Study of verrazano-narrows bridge movements during a New York City marathon［J］, Journal of Bridge Engineering, 16, 1, pp. 127-138, (2011)
  • [5] WANG Q, Characterization of vibration amplitude of nonlinear bridge flutter from section model test to full bridge estimation, Journal of Wind Engineering and Industrial Aerodynamics, 197, (2020)
  • [6] LIU Z W, YI Z T，, CHEN Z Q, Experimental study on aerostatic coefficients of plate-truss composite stiffening girder under skew wind［J］, Journal of Hunan University （Natural Sciences）, 47, 5, pp. 78-87, (2020)
  • [7] DONG G C, HAN Y, Study on flutter stability and mechanism of optimization measure for open-cross-section girder, Journal of Hunan University（Natural Sciences）, 49, 1, pp. 124-134, (2022)
  • [8] Flutter performance optimization of steel truss girder with double-decks by wind tunnel tests［J］, Advances in Structural Engineering, 21, 6, pp. 906-917, (2018)
  • [9] ZHAO L, Review on passive aerodynamic countermeasures on main girders aiming at wind-induced stabilities of long-span bridges［J］, China Journal of Highway and Transport, 32, 10, pp. 34-48, (2019)
  • [10] WANG Y F，, WANG B, Flutter performance study of steel truss girder suspension bridge under large angles of attack ［J］, Journal of Basic Science and Engineering, 27, 2, pp. 384-390, (2019)
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