Abstract
The span length of cable-stayed bridges has become longer with the increment of years, which requires a larger, longer and heavier cable. A heavier construction machine is required to lift the cables up to cable anchoring points on the pylon and large capacity jacking facilities are required to put high tensile force into the cables. From the view point of construction cost, the larger diameter and longer, heavier cables increase the construction cost. In order to reduce the construction cost or keep ordinary construction cost, smaller diameter and lighter cables should be used in substitution of large diameter and heavier cables. Therefore, it is required to investigate the aerodynamic instabilities of multiple cables by changing the number of cables and the space between cables. The present paper shows the experimental results concerning aerodynamic instabilities of two, three and four cables with various arrangements.
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