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Abstract
The long-span cable-stayed bridges considered as a modern form of bridges which is both economical and aesthetic considerations. However, this kind of bridge is characterized by high inhabitant flexibility due to its main girder low depth to span ratio. Since the well-known collapse of Tacoma Narrows Bridge in 1940, great attention has been given to the aero-elastic instability. Especially the problems arising for flutter instability which have a great effect on the safety of this kind of bridges. Many researches have been conducted to improve the flutter instability of bridges by increasing the critical wind velocity. In this research, different arrangement of additional cable net has been adapted as a solution for increasing critical coupled flutter wind velocity and improving the overall behavior of the bridge