What are the differences in flutter characteristics between cable-stayed and suspension bridges?

Answer 1

Since the cables on a suspension bridge pass freely through the support tower(s) while cable-stayed design attaches the cables to the towers, I would expect that cable-stayed construction would be stiffer to vertical deflection, and thus have less responsive longitudinal vibration modes in the vertical plane. Torsional flutter response would probably be most strongly affected by how the cables are attached to the roadway. Center attachment should be more susceptible to torsional flutter since the cable ends would move less than side-attached cables would.
Note: The old Tacoma Narrows Bridge was a suspension design with two-sided roadway support. Footage of its oscillation suggests a primarily torsional mode (ref.), a counterexample to my supposition on torsional flutter, but verbal accounts suggest strong longitudinal and lateral (!)modes as well.

Answer 2

Suspension: Deck is supported by using 2 substantial cables by using secondary cables (hangers). Cable-stayed: Deck is supported by using tower quickly by using cables. Bot structures have following similarities: a million. substantial helping shape is above deck line. 2. Cables and towers are used as helping device won't be in a position to choose of the different similarity :-)