Straight forward method for two-dimensional flutter analysis of super-long-span suspension bridge in frequency domain.

The conventional eigen value analysis method (CEVA) has some shortcomings in solving two-dimensional coupled flutter problems, for example, when the frequency ratio of torsional to bending is approaching 1, the pre-selection of frequency and its iteration is a time consuming work. This paper presents an straight forward method for analyzing two-dimensional coupled flutter of super-long-span suspension bridges, utilizing CEVA method and Ferrari's thoughts on solving univariate equations of four degrees, which has both improvements on work process and work time compared with the CEVA method. Case studies of four different cross section suspension bridges (the ideal plate, close steel box, single slotted steel box, and double slotted steel box) are provided to validate the developed procedure as well as to demonstrate the flutter analysis of super-long-span suspension bridges using straight forward method. The proposed method in this paper enables the researchers to make comparison on the flutter modality, flutter stability performance and freedom coupling extent of suspension bridges with different mid-span and different cross sections. [ABSTRACT FROM AUTHOR]