肇庆西江特大桥动力特性分析

Analysis on the dynamic properties of Zhaoqing Xijiang Bridge

南广铁路肇庆西江特大桥为我国目前跨度最大(450 m)的钢箱提篮拱桥,根据大桥的结构特点,采用ANSYS建立了全桥空间有限元模型,利用分块兰卡斯方法计算了该桥的自振频率和振型,并探讨了拱肋内倾角对大跨度钢箱提篮拱桥动力特性的影响,可为该桥的健康监测、抗风和抗震分析提供前提条件和依据,并可为大跨度钢箱提篮拱桥的设计与动力特性研究提供参考。

Zhaoqing Xijiang Bridge on Nanning-Guangzhou Railway is a steel box x-style arch bridge with the largest span（450 meters） in China.Based on the construction drawings and structural characteristics,the spatial finite element model was established by ANSYS software,and the natural frequencies as well as vibration modes of the bridge were calculated with Lanbcos method.Besides,the influence of arch＇s introverted inclination angle to the dynamic properties of long-span steel box x-style arch bridge was discussed,which could not merely act as the premise of health monitoring,wind stability analysis and seismic analysis,but also provide reference for the design as well as dynamic behavior of long-span steel box x-style arch bridge.