设置中央稳定板对大跨度悬索桥抗风性能的影响

在润扬长江公路大桥南汊悬索桥的节段模型风洞试验中,研究了稳定板高度对动力抗风稳定性的影响,采用了增设0.65 m高中央稳定板的有效措施,并获得了原断面和增设中央稳定板断面的气动导数和三分力系数;采用非线性静风和颤抖振时域方法,研究了设置中央稳定板对静动力抗风性能影响。结果表明,恰当地设置中央稳定板,不仅能够提高桥梁的颤振临界风速,还能够降低结构的抖振响应,而结构的静风失稳风速在正攻角下有所降低。

Influence of Installation of Central Stabilized Plate on Wind Resistance Performance of Long Span Suspension Bridge

In the wind tunnel test for segmental model of the south bridge(suspension bridge) of Runyang Changjiang River Highway Bridge,the influence of height of central stabilized plate on the aerodynamic wind resistance stability of the bridge was investigated.The effective measure of installation of a central stabilized plate 0.65 m in height was chosen and the aerodynamic derivatives and three-component aerodynamic coefficients of the original bridge girder cross section and the girder cross section installed with the central stabilized plate were obtained.The nonlinear aerostatic stability method and the flutter and buffeting time-domain method were used to study the influence of the central stabilized plate on the aerostatic and aerodynamic wind resistance performance.The results show that the proper installation of the central stabilized plate can not only improve the flutter critical wind speed of the bridge,but also can decrease the buffeting response of the structure while the aerostatic instability wind speed of the structure will decrease a little at the positive wind attack angle.