- 摘 要
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（鄭州航空工業(yè)管理學(xué)院， 鄭州 450000）
［摘要］運用SAP2000軟件建立了河南電視塔的桿系三維有限元模型，利用諧波合成法并考慮塔式結(jié)構(gòu)風(fēng)速譜隨豎向變化的特點，模擬了該電視塔多變量互相關(guān)脈動風(fēng)荷載時程曲線，并對該塔整體模型、天線段部分及主體結(jié)構(gòu)部分分別進行了模態(tài)分析及風(fēng)荷載作用下的風(fēng)振動力響應(yīng)時程分析。結(jié)果表明，附加天線桅桿后，其振動對主體結(jié)構(gòu)的振動形式在低頻段影響較小，在高頻段該塔的運動形式改變較大，高振型的影響不可忽視；河南電視塔作為一超高全鋼結(jié)構(gòu)塔，風(fēng)荷載作用下動力反應(yīng)較大，由于天線段高柔，附加天線桅桿后整體結(jié)構(gòu)的自振周期明顯增加，從而產(chǎn)生了較強的鞭梢效應(yīng)，卻在一定程度上減小了塔樓的加速度。
［關(guān)鍵詞］河南電視塔； 超高塔； 鞭梢效應(yīng)； 模態(tài)分析； 時程分析
中圖分類號：TU398-7文獻標(biāo)識碼：A文章編號：1002-848X(2016)14-0100-04
Analysis and research on whipping effect of Henan TV tower
Yan Xiangmei, Liu Jie
(Zhengzhou University of Aeronautics, Zhengzhou 450000, China）
Abstract:A bar system three-dimensional finite element model of Henan TV tower was established using SAP2000 software. The harmonic synthesis method was used to simulate the time-history curve of TV tower′s multivariate correlated fluctuating wind load, considering the characteristics of the wind speed spectrum of the tower structure changed along the vertical elevations. And the modal analyses as well as wind-induced dynamic response time-history analyses under wind load were carried out on the whole model of the tower, antenna part and the main structure respectively. The results show that the vibration of the additional antenna mast has little effect on main structure′s vibration form in low frequency band. The vibration form of the tower has larger changes in the high frequency band, so effects of higher mode cannot be ignored. Henan TV tower is a super high-rise steel structure tower, and it has great dynamic reaction under wind load. Due to the high and soft antenna section, the natural period of the whole structure increases significantly with additional antenna mast added, which results in a strong whipping effect and reduces the acceleration of the tower to a certain extent.
Keywords:Henan TV tower; super high-rise tower; whipping effect; modal analysis; time-history analysis
*國家自然科學(xué)基金青年基金項目（51508524），鄭州市科技局科技攻關(guān)項目（20150405），河南省教育廳科技攻關(guān)項目（14B560006）。
作者簡介：閆祥梅，博士，講師，Email: yxm0927@163.com。
