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为寻求适用于超大跨度桥梁的具有更优气动特性的主梁断面,推动我国超大跨桥梁建设的发展,针对超大跨度桥梁原型设计中提出的5种主梁断面形式,采用CFD数值模拟方法计算得到了各断面的静力和动力气动参数,并进一步计算了对应5种主梁断面桥梁的静风失稳临界风速及颤振临界风速,对比了各断面的静动力稳定性能。结果表明,分离双箱主梁和分离3箱主梁的气动性能优于其他类型主梁断面;单箱主梁和双箱主梁气动特性目前已得到较大程度的优化,3箱主梁气动特性应具有较大的优化空间,椭圆形主梁及重力式主梁气动性能较差,优化价值有限。
In order to seek the section of main girder with better aerodynamic characteristics and to promote the construction of super-long-span bridges in our country, five kinds of main girder sections proposed in the prototype design of super-long span bridges are calculated by CFD numerical simulation The static and dynamic aerodynamic parameters of each section were calculated and the critical wind speed and flutter critical wind speed of the bridge corresponding to the five kinds of main girder sections were calculated. The static and dynamic performance of each section was compared. The results show that the aerodynamic performance of the separation of two-girder main girder and the separation of three main girders is better than that of other types of main girder. The aerodynamic characteristics of single girder and double girder have been optimized to a great extent. The aerodynamic characteristics of three girders With a large space for optimization, the aerodynamic performance of the elliptical main girder and the gravity girder is poor, and the optimization value is limited.