Inclined-Cable Aerodynamics

by M. Matsumoto, Kyoto Univ, Japan,
C. W. Knisely, Kyoto Univ, Japan,
N. Shiraishi, Kyoto Univ, Japan,
M. Kitazawa, Kyoto Univ, Japan,
T. Saitoh, Kyoto Univ, Japan,

Document Type: Proceeding Paper

Part of: Structural Design, Analysis and Testing


A series of wind tunnel tests have been conducted to clarify the fundamental mechanism of the vibration of the inclined cables of cable stayed bridges. The influence of the cable orientation relative to the wind direction, the cable diameter, mass, surface roughness and surface chemistry (water repellency), natural frequencies and structural damping of the cable, the wind velocity and the intensity of the simulated rain on the onset and amplitude of vibration were examined. The induced axial secondary flow about the inclined cable was found to play a major role in the excitation of the cable. The results from additional tests with spring-mounted rigid cylinders oriented perpendicular to the oncoming wind, but with an externally applied secondary axial wake flow were in excellent agreement with the results from the tests on inclined cables. The presence of rain appears to act as an amplifier for the already existing inclined cable instability.

Subject Headings: Cables | Cable stayed bridges | Vibration | Bridge tests | Wind tunnel | Suspension bridges | Wind direction | Hydraulic roughness

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