Wind and Structures

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Aerostatic load on the deck of cable-stayed bridge in erection stage under skew wind

  • Li, Shaopeng (Research Centre for Wind Engineering, Southwest Jiaotong University) ;
  • Li, Mingshui (Research Centre for Wind Engineering, Southwest Jiaotong University) ;
  • Zeng, Jiadong (Research Centre for Wind Engineering, Southwest Jiaotong University) ;
  • Liao, Haili (Research Centre for Wind Engineering, Southwest Jiaotong University)
  • Received : 2015.04.01
  • Accepted : 2015.10.20
  • Published : 2016.01.25
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Abstract

In conventional buffeting theory, it is assumed that the aerostatic coefficients along a bridge deck follow the strip assumption. The validity of this assumption is suspect for a cable-stayed bridge in the construction stages, due to the effect of significant aerodynamic interference from the pylon. This situation may be aggravated in skew winds. Therefore, the most adverse buffeting usually occurs when the wind is not normal to bridge axis, which indicates the invalidity of the traditional "cosine rule". In order to refine the studies of static wind load on the deck of cable-stayed bridge under skew wind during its most adverse construction stage, a full bridge 'aero-stiff' model technique was used to identify the aerostatic loads on each deck segment, in smooth oncoming flow, with various yaw angles. The results show that the shelter effect of the pylon may not be ignored, and can amplify the aerostatic loading on the bridge deck under skew winds ($10^{\circ}-30^{\circ}$) with certain wind attack angles, and consequently results in the "cosine rule" becoming invalid for the buffeting estimation of cable-stayed bridge during erection for these wind directions.

Keywords

Acknowledgement

Supported by : National Natural Science Foundation

References

  1. Davenport, A.G., Isyumov, N., Fader, D.J. and Bowen, C.F.P. (1969a), A study of wind action on a suspension bridge during erection and on completion: the Narrows bridge, BLWT-3-69.
  2. Davenport, A.G., Isyumov, N., Fader, D.J. and Bowen, C.F.P. (1969b), An aeroelastic study of the Northumberland straits bridge-cantilevered concrete design, BLWT-4-69.
  3. Davenport, A.G., Isyumov, N. and Tanaka, H. (1976), A study of wind action for the Bronx Whitestone suspension bridge, BLWT-SS3-76.
  4. Gamble, S.L. and Irwin, P.A. (1985), "The action of wind on a cable stayed bridge during construction", Proceedings of the 5th US National Conference in Wind Engineering, Lubbock, America, November.
  5. Kimura, K. and Tanaka, H. (1992), "Bridge buffeting due to wind with yaw angles", J. Wind Eng. Ind. Aerod., 42(1-3), 1309-1320. https://doi.org/10.1016/0167-6105(92)90139-2
  6. Li, S.P., Li, M.S. and Ma, C.M. (2013), "Buffeting analysis of long span bridge under skew wind in frequency domain", Proceedings of the 8th Asia-Pacific Conference on Wind Engineering, Chennai, India, December.
  7. Liu, X.B., Chen, Z.Q. and Liu, Z.W. (2008), "Experimental study on the aerodynamic coefficients of long span bridge deck under skew winds (in Chinese)", J. Hunan Univ. :Nat. Sci. Ed., 35(9), 9-14.
  8. Melbourne, W.H. (1980), "Model and full scale response to wind action of the cable stayed box girder west gate bridge", Proceedings of the IAHR/IUTAM Symposiums on Practical Experiences with Flow-Induced Vibrations, Karlsruhe, Germany, September.
  9. Scanlan, R.H. (1993), "Bridge buffeting by skew winds in erection stages". J. Eng. Mech.-ASCE, 119(2), 251-269. https://doi.org/10.1061/(ASCE)0733-9399(1993)119:2(251)
  10. Scruton, C. (1951), Experiments on the aerodynamic stability of suspension bridges, NPL-185-199.
  11. Sun, Y.G., Li, M.S. and Liao, H.L. (2013), "Investigation on vortex-induced vibration of a suspension bridge using section and full aeroelastic wind tunnel tests", WindStruct.,17(6), 565-587.
  12. Tanaka, H. and Davenport, A.G. (1982), "Response of taut strip models to turbulent wind", J. Eng. Mech. Div.-ASCE, 108(1), 33-49.
  13. Xie, J. and Tanaka, H. (1991), "Buffeting analysis of long span bridges to turbulent wind with yaw angles", J. Wind Eng. Ind. Aerod., 37(1), 65-77. https://doi.org/10.1016/0167-6105(91)90005-H
  14. Xu, Y.L. and Zhu, L.D. (2005), "Buffeting response of long-span cable-supported bridges under skew winds. Part 2: case study", J. Sound Vib., 281(3-5), 675-697. https://doi.org/10.1016/j.jsv.2004.01.025
  15. Zan, S.J. (1987), The effects of mass, wind angle and erection technique in the aeroelastic behavior of a cable-stayed bridge model, NAE-AN-46.
  16. Zhu, L.D. (2002), Buffeting response of long span cable supported bridges under skew winds field measurement and analysis. Ph.D. Dissertation, The Hong Kong Polytechnic University, Hong Kong.
  17. Zhu, L.D., Wang, M., Wang, D.L., Guo, Z.S. and Cao, F.C. (2007), "Flutter and buffeting performances of third Nanjing bridge over Yantze river under yaw wind via aeroelastic model test". J. Wind Eng. Ind. Aerod., 95(9-11), 1579-1606. https://doi.org/10.1016/j.jweia.2007.02.019
  18. Zhu, L.D., Xu, Y.L., Zhang, F. and Xiang, H.F. (2002a), "Tsing Ma bridge deck under skew winds. Part I: aerodynamic coefficients", J. Wind Eng. Ind. Aerod., 90(7), 782-805.
  19. Zhu, L.D., Xu, Y.L. and Xiang, H.F. (2002b), "Tsing Ma bridge deck under skew winds-Part II: flutter derivatives", J. Wind Eng. Ind. Aerod., 90(7), 807-837. https://doi.org/10.1016/S0167-6105(02)00159-9