Abstract
Flutter stabilization is one of the most important engineering problems in wind-resistant design of long-span bridges, particularly constructed in a large strait crossing project. Previous investigations have shown 2-box girder sections get superior stability performances against flutter through various attachments. However the mechanism of flutter stabilization has not been cleared thoroughly. In this study, the aerodynamic characteristics and the flutter stability performance of 2-box girder sections with attachments are examined by wind tunnel tests and complex eigen value analyses. Tested attachment sets are combinations of three typical devices of the center barrier, the parapets and the rails for a maintenance carrier. The mechanism of stabilization in each attachment set is explained from the change of important components in unsteady aerodynamic derivatives.
