大跨度柔性斜拉-悬索体系风致静动力响应研究

发布时间：2018-08-24 20:03

【摘要】：在风作用下大跨度斜拉-悬索体系具有明显的三维流动特点,其风效应较为复杂,同时斜拉-悬索体系跨度大、刚度小、对风作用较为敏感,易产生风致振动。该文以空中客车系统为工程背景,首先通过1∶1足尺节段模型风洞试验得到主缆和轨道的气动力系数,然后在分析风、主缆、轨道三者相互作用的基础上,对有限元分析软件ANSYS进行二次开发,建立风、主缆、轨道非线性空间分析模型,通过风荷载的自动加载,实现风致静动力响应全过程仿真模拟,从而得到主缆、轨道的静动力响应。计算结果表明,结构整体表现较柔,在设计风速下轨道和主缆横向位移较大,结构横向总响应较竖向总响应要大得多,结构总响应以横桥向为主。研究结论可为大跨度柔性斜拉-悬索体系的进一步优化设计提供依据。
[Abstract]:The long-span cable-stayed suspension system has obvious three-dimensional flow characteristics under the action of wind, and its wind effect is more complex. At the same time, the cable-stayed suspension system has large span, small stiffness, sensitive to wind action and easy to produce wind-induced vibration. Taking the Airbus system as the engineering background, the aerodynamic coefficients of the main cable and the track are obtained by the full-scale wind tunnel test at 1:1, and then on the basis of the analysis of the interaction among wind, main cable and track. The finite element analysis software ANSYS is redeveloped, and the nonlinear spatial analysis model of wind, main cable and track is established. Through the automatic loading of wind load, the whole process simulation of wind-induced static and dynamic response is realized, and the main cable is obtained. The static and dynamic response of the orbit. The calculation results show that the whole structure is flexible, the lateral displacement of track and main cable is larger under the design wind speed, the total lateral response of the structure is much larger than that of the vertical total response, and the overall response of the structure is mainly in the transverse bridge direction. The conclusion can provide the basis for further optimization design of long span flexible cable-stayed-suspension system.
【作者单位】：西南交通大学桥梁工程系;
【基金】：国家科技支撑计划课题项目(2012BAG05B02) 中央高校基本科研业务费专项资金项目(SWJTU11CX008,SWJTU11CX127)
【分类号】：U18

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