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采用有限元软件ANSYS建立某钢结构电视塔三维有限元模型,在此基础上得出其等效串联多自由度体系模型,对比了两种模型的动力特性;分析研究了Davenport谱、Harris谱、西安热工所谱、Kaimal谱、Simiu谱5种常用脉动风速谱的特点及其对结构风振响应的影响;比较了M.Shinozuka法、星谷胜法2种脉动风速模拟方法的模拟精度;并探讨了风振响应中天线桅杆的影响及高阶振型的贡献。结果表明:两种计算模型的动力特性较接近,利用串联多自由度体系模型进行高耸塔式结构的风振响应分析可行;采用Davenport谱进行结构设计偏于安全;M.Shinozuka法相对星谷胜法模拟精度较高;天线桅杆的改变对塔楼和整体结构加速度影响明显,天线设计中应综合考虑鞭梢效应和对舒适度的影响;塔楼的最大加速度超过了舒适度的要求,有必要进行风振控制。
The three-dimensional finite element model of a steel structure TV tower was established by the finite element software ANSYS. Based on this, the equivalent multi-degree-of-freedom multi-degree-of-freedom model was obtained and the dynamic characteristics of the two models were compared. The Davenport spectrum, Harris spectrum, Xi’an Thermal Engineering spectrum, Kaimal spectrum and Simiu spectrum, and their effects on the wind-induced vibration response of the structure were compared. The simulation accuracy of the two wind-induced wind velocity simulations by M.Shinozuka method and Xingguisheng method was compared. The effect of antenna mast in wind-induced vibration response and the contribution of high-order modes are discussed. The results show that the dynamic characteristics of the two models are close to each other, and it is feasible to use the model of multi-degree-of-freedom system to analyze the wind-induced vibration response of tall tower structure. The Davenport spectrum is safe for structure design. The simulation accuracy is high; the change of the antenna mast has a significant effect on the acceleration of the tower and the whole structure; the whiplash effect and the influence on the comfort should be considered in the antenna design; the maximum acceleration of the tower exceeds the requirement of comfort; control.