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(1 上海大學(xué)土木工程系，上海 200072； 2 江蘇省建筑設(shè)計(jì)研究院有限公司，南京 210029)
［摘要］基于臺風(fēng)的基本特性，采用合適的臺風(fēng)風(fēng)速譜，運(yùn)用數(shù)值模擬方法，仿真得到與結(jié)構(gòu)豎向相關(guān)的18條脈動(dòng)風(fēng)載時(shí)程樣本。為提高計(jì)算效率和精度，引入了快速傅立葉變換技術(shù)。通過比較自功率譜和自相關(guān)函數(shù)可以看出，模擬值和目標(biāo)值吻合得較好，從而驗(yàn)證了風(fēng)場模擬的準(zhǔn)確性與有效性。采用有限元方法建立了某高聳鋼塔結(jié)構(gòu)的三維有限元模型，并在時(shí)域內(nèi)研究該結(jié)構(gòu)在臺風(fēng)作用下的動(dòng)力響應(yīng)。通過對比分析采用石沅臺風(fēng)風(fēng)譜、田浦臺風(fēng)風(fēng)譜和Davenport風(fēng)譜計(jì)算該結(jié)構(gòu)風(fēng)載時(shí)程及風(fēng)振響應(yīng)結(jié)果的差異性，得出一些有參考價(jià)值的結(jié)論。
［關(guān)鍵詞］高聳結(jié)構(gòu)；臺風(fēng)功率譜密度；快速傅立葉變換；有限元法；風(fēng)致動(dòng)力響應(yīng)
Dynamic response analysis of a highrising structure under typhoon
Xu Xu1， Liu Yu2(1 Department of Civil Engineering, Shanghai University, Shanghai 200072, China;2 Jiangsu Provincial Architectural Design & Research Institute Co., Ltd., Nanjing 210029, China)
Abstract: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.
Keywords:high-rising structure； power spectral density; typhoon; FFT; finite element method; wind-induced dynamic response
*上海市教委科研資助項(xiàng)目(05AZ77)。
作者簡介：徐旭（1968-），男，博士，副教授，Email:xxu@mail.shu.edu.cn。
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