發(fā)布時間：2018-10-13 18:48

【摘要】：為系統(tǒng)研究超過規(guī)范高度限值(190 m)的特大型冷卻塔風(fēng)振特性及風(fēng)振系數(shù),以國內(nèi)某在建的高度200 m的特大型冷卻塔為研究對象,基于大渦模擬技術(shù)對該冷卻塔進(jìn)行了平均和脈動風(fēng)荷載的數(shù)值模擬,并將模擬結(jié)果與規(guī)范曲線以及國內(nèi)外現(xiàn)有實測結(jié)果進(jìn)行對比,驗證數(shù)值模擬方法的有效性。在此基礎(chǔ)上,采用有限元方法對該特大型冷卻塔的動力特性、風(fēng)振響應(yīng)與風(fēng)振系數(shù)進(jìn)行了系統(tǒng)分析,探討了以塔筒迎風(fēng)面子午向軸力、迎風(fēng)面的von Mises應(yīng)力、節(jié)點徑向位移、子午向軸力和環(huán)向彎矩為目標(biāo)響應(yīng)的風(fēng)振系數(shù)取值方法,歸納出高度200 m特大型冷卻塔二維風(fēng)振系數(shù)空間分布特征顯著且在塔筒底部及背風(fēng)區(qū)普遍較大的分布規(guī)律,給出了此類特大型冷卻塔風(fēng)振系數(shù)的取值建議和二維擬合公式。主要研究結(jié)論可為高度200 m特大型冷卻塔的抗風(fēng)設(shè)計提供科學(xué)依據(jù)。
[Abstract]:In order to systematically study the wind-induced vibration characteristics and wind-induced vibration coefficients of super large cooling towers exceeding the specified height limit (190m), a 200 m high super large cooling tower under construction in China is taken as the research object. The numerical simulation of the average and pulsating wind loads of the cooling tower is carried out based on the large eddy simulation technology. The effectiveness of the numerical simulation method is verified by comparing the simulation results with the standard curves and the measured results at home and abroad. On this basis, the dynamic characteristics, wind-induced vibration response and wind-induced vibration coefficient of the super large cooling tower are systematically analyzed by using finite element method. The meridional axial force of the upwind surface, the von Mises stress of the upwind plane, and the radial displacement of the node are discussed. Based on the method of selecting wind vibration coefficient in response to meridional axial force and toroidal bending moment, the spatial distribution characteristics of two-dimensional wind vibration coefficient of 200 m super large cooling tower are concluded, which are generally larger at the bottom of the tower tube and in the backwind region. The value of wind vibration coefficient of the super large cooling tower and the two-dimensional fitting formula are given. The main conclusions can provide scientific basis for wind resistance design of 200 m super large cooling tower.
【作者單位】： 南京航空航天大學(xué)土木工程系;
【基金】：江蘇省優(yōu)秀青年基金項目(BK20160083) 國家自然科學(xué)基金項目(51208254) 中國博士后科學(xué)基金項目(2013M530255,1202006B) 江蘇高校青藍(lán)工程項目
【分類號】：TU312.1

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