【摘要】 基于风洞试验与数值模拟，对悬吊双层扁平箱梁颤振性能进行了研究。通过模态分解、断面分布压力和流场模态对悬吊双层扁平箱梁的颤振性能进行了分析。研究结果表明：对于悬吊双层扁平箱梁，下层断面在上层断面气动干扰下，其下缘大尺度旋涡的生成、迁移及脱落导致下层断面发生软颤振；由于双层断面之间的结构静力耦合，在下层断面软颤振驱动下，双层扁平箱梁振动系统整体发生软颤振。更多还原

【Abstract】 The flutter performance of a suspended double-deck flat box girder was studied using a wind tunnel and numerical simulation. The flutter performance of the suspended double-deck flat box girder was analyzed through modal decomposition, section pressure distribution, and flow field modal. The research indicates that under the aerodynamic interference from upper section, the generation, migration, and shedding of large-scale vortices at the lower edge of the lower section cause that the lower section produces the bending-torsional coupling “soft flutter”. Moreover, due to the structural static coupling between the upper section and the lower section, the bending-torsional soft flutter at the lower section induces the bending-torsional soft flutter of the double-deck flat box girder.更多还原