中文摘要：

随着桥梁跨径不断增大,抗风性能已成为设计中的关键控制性因素。由典型流线型钢箱梁中央开槽而来的分离式双箱主梁在超大跨径桥梁中具有广阔的应用前景。但目前针对分离式双箱主梁断面气动优化的研究多围绕某单一气动措施的优化展开,关于多种气动措施配合使用对其气动性能影响的研究较少。以同时设置了风嘴、导流板和分流板的分离式双箱主梁断面为对象,设计了16种断面形式,从静风稳定性和颤振稳定性两方面,研究了多种气动措施共存情况下,各气动措施对分离式双箱主梁断面抗风性能的影响,从而得到各气动措施的优化设置方法。研究成果对提高超大跨径桥梁抗风性能具有指导意义。

英文摘要：

With the bridge span increasing,the wind-resistant performance of bridge has become a key controlling factor in design. Evolving from typical streamline box girder by slotting in center,separated twin-girder deck has a good application prospect in the super large-span bridge. However,most of the research results published on the aerodynamic optimization for separated twin-girder decks focus on single aerodynamic measure,and little research work has been done to improve the aerodynamic performance with multiple aerodynamic measures. In this paper,the separated twin-girder deck with wind fairing,guide vane,and splitter plate is studied. Sixteen girder separated twin-girder decks are designed. The aerostatic stability and the flutter stability are compared to study the effects of different aerodynamic measures on the wind-resistant performance of the separated twin-girder deck when multiple aerodynamic measures are used. The research results about aerodynamic measures arrangement methods can provide reference for improving the wind-resistant performance of super large-span bridges.