抄録
A multiple-span suspension bridge has been often proposed for strait crossings because of the advantage of reducing huge intermediate anchorages. However, it has a disadvantage of large static deflection and therefore a countermeasure was proposed such as stiffer intermediate towers. The characteristics of the static deflection have been studied by some researchers, however a limited number of studies on that aerodynamics have been done so far. In this study, flutter characteristics of a 4-span suspension bridge with main span length of 2,000 - 4,000m were investigated by flutter analysis. The results showed that its flutter speed is lower than that of a 3-span with the same center-span length, and that the side-span length of a 4-span suspension bridge affects the flutter speed less than that of a 3-span suspension bridge.
