1.School of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang 050043, China;
2.State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures, Shijiazhuang Tiedao University, Shijiazhuang 050043, China;
3.Innovation Center for Wind Engineering and Wind Energy Technology of Hebei Province, Shijiazhuang 050043, China
Abstract：Rain-wind-induced and vortex induced vibration of stay cables are widely concerned problems of wind-induced vibration. In order to suppress wind rain vibration, setting longitudinal ribs on the surface of stay cables is one of the commonly used aerodynamic measures. The influence of the parameters of the longitudinal ribs on the vortex induced vibration performance and the aerodynamic force of the stay cable is worth studying. Through the wind tunnel test, the aerodynamic force and vortex induced vibration of the stay cable under different included positions were studied for the rectangular parallelepiped ribs with width and height of 5mm arranged on the surface of the stay cable. The results show that for aerodynamic forces, Reynolds number has little effect on the wind pressure distribution of stay cables when the included position of ribs is ≥25°; When the included position of ribs is ≤30°, the average resistance coefficient of stay cables with ribs is smaller than that of cables without ribs; When the included position of the ribs is ≥35°, the average resistance coefficient and the average lift of the stay cable do not change with the Reynolds number, while when the included position of the ribs is =60°, the average resistance coefficient of the stay cable reaches the maximum, which is about 1.7. For vortex induced vibration, under the condition of rib included position =55°, the vortex induced vibration of stay cables is completely suppressed, which can be applied to practical projects to suppress the vortex induced vibration of stay cables and related slender column structures; However, when the included position is 60°, although the vortex-induced vibration amplitude of the stay cable is smaller than that of the cable, the wind speed locking range of the vortex-induced vibration will be amplified, which should be fully considered in practical engineering.
常幸1，孙一飞1，邵林媛1，刘庆宽1,2,3. 纵向肋条对斜拉索气动力和涡激振动特性影响的试验研究[J]. 振动与冲击, 2023, 42(16): 47-55.
CHANG Xing1，SUN Yifei1，SHAO Linyuan1，LIU Qingkuan1,2,3. Experimental study on the influence of longitudinal ribs on the aerodynamic force and vortex-induced vibration characteristics of stay cables. JOURNAL OF VIBRATION AND SHOCK, 2023, 42(16): 47-55.
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