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某公铁两用三塔悬索桥主桥长1 704m,结构形式复杂,基本风速较高,抗风稳定性是该桥进行设计和施工的主要控制因素之一。以该桥成桥状态的结构动力特性为基础,分别进行了基本风参数分析,主梁断面静气动力系数数值模拟,主梁断面气动导数数值模拟,多模态耦合三维颤振分析,最后进行了结构风荷载分析和风荷载响应计算。结果表明该桥成桥的颤振稳定性能较差,需要进一步采取措施来提高颤振稳定性能;在静阵风荷载作用下,主梁跨中侧向位移较大。
The main bridge of a three-suspension railway bridge with a length of 1 704m has complex structural forms and high basic wind speed, and the wind-resistant stability is one of the main control factors in the design and construction of the bridge. Based on the structural dynamic characteristics of the bridge, the basic wind parameters, the numerical simulation of the main aerodynamic and aerodynamic coefficients of the main girder, the aerodynamic derivative numerical simulation of the main girder and the multi-mode coupled three-dimensional flutter analysis are carried out respectively. Finally, Structural Wind Load Analysis and Wind Load Response Calculation. The results show that the flutter stability of the bridge is poor, and further measures are needed to improve the flutter stability. Under the static gust wind load, the mid-span displacement of the main beam is larger.