Analysis of mitigation effect of longitudinal ribs on stay cable

doi:10.16265/j.cnki.issn1003-3033.2019.06.022

Abstract

Abstract: This paper is presented in order to study the mitigation mechanism of longitudinal ribs on rain-wind-induced vibration. Firstly, a theoretical vibration model of stay cables with kinetic rivulet which could be used for different aerodynamic shapes was established. Then the coupled water film oscillation and cable vibration equations were deduced. Finally, the theoretical model was used to study cable vibration response, water film features and changes of aerodynamic lifts and drags of stay cables with different longitudinal ribs. The results show that longitudinal ribs could suppress the formation of upper rivulet, and the increase of longitudinal ribs number could reduce the occurrence of rain-wind-induced vibration; the mitigation effect will be the best when the stay cable is installed with 12 longitudinal ribs since the dominant frequency of water film will deviate from the inherent frequency of stay cables, thus reducing the amplitude of crosswind while ensuring the drag coefficient is small and the amplitude of stay cable is decreased, the mitigation effect is the best.

Key words: rain-wind- induced vibration, numerical simulation, upper rivulet, aerodynamic forces, longitudinal ribs

CLC Number:

X966

BI Jihong, QIAO Haoyue, GUAN Jian, WANG Jian. Analysis of mitigation effect of longitudinal ribs on stay cable[J]. China Safety Science Journal, 2019, 29(6): 134-139.

References

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