闭口箱梁水平分流板颤振控制效果与机理OA

Based on a closed-box girder design for a sea-crossing bridge,five horizontal splitter plates with different widths were designed,and section model vibration tests were conducted.The influence mechanism of fixed horizontal splitter plates on the flutter performance of the closed-box girder was analyzed.A movable horizontal splitter plate was also designed,and its control effect and mechanism were investigated through wind tunnel tests.The results indicate that fixed horizontal splitter plates with different widths improve the section flutter performance at 0° and+3° attack angles,whereas they deteriorate the flutter performance to varying degrees at a −3° attack angle.Compared with the fixed horizontal splitter plates,the movable horizontal splitter plate further improves the overall section flutter performance.At a+3° attack angle,the flutter performance is improved by more than 20%,and the critical attack angle for flutter is simultaneously shifted from+3° to − 3°.The section flutter performance is jointly influenced by the aerodynamic shape alteration induced by the torsional static wind displacement of the windward plate and the tuned-mass-like effect of the leeward plate motion on the vibration of the main girder.