摘要
基于台风的基本特性,采用合适的台风风速谱,运用数值模拟方法,仿真得到与结构竖向相关的18条脉动风载时程样本。为提高计算效率和精度,引入了快速傅立叶变换技术。通过比较自功率谱和自相关函数可以看出,模拟值和目标值吻合得较好,从而验证了风场模拟的准确性与有效性。采用有限元方法建立了某高耸钢塔结构的三维有限元模型,并在时域内研究该结构在台风作用下的动力响应。通过对比分析采用石沅台风风谱、田浦台风风谱和Davenport风谱计算该结构风载时程及风振响应结果的差异性,得出一些有参考价值的结论。
Considering the basic characteristics of typhoon, 18 samples of fluctuating wind loads have been numerically simulated based on the appropriate wind speed spectrum of typhoon. At the same time, the fast Fourier transformation （FFT） technique is also introduced in order to improve the calculation efficiency and precision. By comparing the auto power spectrum and auto correlation function, the veracity and feasibility of the simulation method raised here have also been validated, for the agreement of the simulation value with the target one. A three-dimensional finite element model of a high-rising steel tower structure has been established by using finite element method, and the dynamic response of the steel tower structure under typhoon is studied in the time domain. Finally, some valuable conclusions are obtained by comparing the forementioned results with those of the classical method, where the Davenport spectrum is used.
出处
《建筑结构》
CSCD
北大核心
2009年第6期105-109,共5页
Building Structure
基金
上海市教委科研资助项目(05AZ77)
关键词
高耸结构
台风功率谱密度
快速傅立叶变换
有限元法
风致动力响应
high-rising structure
power spectral density
typhoon
FFT
finite element method
wind-induced dynamic response
