大跨度悬索桥中央开槽箱梁断面的颤振性能

以建成后将成为世界最大跨径的钢箱梁悬索桥——西堠门大桥为例，通过节段模型风洞试验、CFD数值模拟和理论计算对中央开槽箱梁断面的颤振稳定性能进行研究，分析了开槽宽度和箱梁内外侧局部气动外形的改变对中央开槽箱梁断面颤振稳定性能的影响。研究结果表明：开槽宽度对中央开槽箱梁断面的颤振稳定性能影响显著；箱梁内外侧局部气动外形的改变也会对结构颤振性能产生一定的影响，而且影响规律更为复杂。

Flutter Performance of Central-slotted Box Girder Section for Long-span Suspension Bridges

Based on Xihoumen Bridge, which will be the longest steel box girder suspension bridge in the world, the flutter performance of central-slotted box girder section was studied through sectional model wind tunnel test, CFD numerical simulation and theoretical calculation. The influences of the variation of slot width, local aerodynamic configuration inside and outside the box girder section on the flutter performance of central-slotted box girder section were analyzed. The research results show that slot width has significant influence on the flutter performance of central-slotted box section; the variation of local aerodynamic configuration inside and outside the box girder section will also influence the structural flutter performance to a certain extent and its influence rule is more complex.