Flutter Performance and Surrounding Flow Structures of Central-Slotted Box Girders

摘要

Investigation on flutter stabilization and its mechanism of long-span suspension bridges with box girders by using central air vent, which resulted in central-slotted box girders, was introduced in this paper. With the experimental results of wind tunnel tests, the minimum values of critical flutter speeds for certain slot width were always measured at the +3° angle of attack. Based on the concept of full-degree coupling analysis, stabilization mechanism was found with the references of aerodynamic damping and degree participation. The characteristics of main vortices around the decks in the flow field obtained from Particle Image Ve-locimetry (PIV) wind tunnel tests and numerical calculations were finally investigated.