本文選題：冷卻塔 + 風(fēng)洞試驗(yàn)　； 參考：《振動(dòng)與沖擊》2017年03期

【摘要】：為全面獲得冷卻塔塔筒的風(fēng)致動(dòng)力響應(yīng)特征,探究各響應(yīng)包括內(nèi)力和位移的峰值因子g、動(dòng)力放大系數(shù)D以及用于結(jié)構(gòu)設(shè)計(jì)的風(fēng)振系數(shù)β的取值和各參數(shù)在不同響應(yīng)間的差異,以某大型冷卻塔為例,經(jīng)風(fēng)洞試驗(yàn)獲得塔筒表面風(fēng)壓時(shí)程,采用時(shí)程方法進(jìn)行結(jié)構(gòu)動(dòng)力響應(yīng)計(jì)算。分析表明,作為空間結(jié)構(gòu),不同位置不同響應(yīng)的g值和D值有較大差異,難以直接應(yīng)用;但結(jié)合各響應(yīng)的時(shí)程特征、塔筒結(jié)構(gòu)特性及配筋設(shè)計(jì)原則,可以將塔筒的g值和D值從環(huán)向和子午向的二維分布簡(jiǎn)化為僅沿子午向的一維分布,由此所得各響應(yīng)的D值可達(dá)工程實(shí)用范圍,但用法與現(xiàn)行設(shè)計(jì)方法仍不一致;根據(jù)環(huán)向和子午向配筋設(shè)計(jì)的獨(dú)立性,并考慮風(fēng)致各內(nèi)力在結(jié)構(gòu)設(shè)計(jì)中的不同權(quán)重,在實(shí)用中對(duì)D值可僅區(qū)分環(huán)向內(nèi)力和子午向內(nèi)力獨(dú)立取值,但環(huán)向內(nèi)力的D值要大于子午向內(nèi)力。此時(shí),環(huán)向和子午向的D值即可作為風(fēng)振系數(shù)β參與結(jié)構(gòu)設(shè)計(jì)。
[Abstract]:In order to obtain the characteristics of wind-induced dynamic response of cooling tower and tube in an all-round way, the responses including the peak factor g of internal force and displacement, the dynamic magnification factor D, the value of wind-induced vibration factor 尾 used for structural design and the difference of each parameter in different responses are explored. Taking a large cooling tower as an example, the wind pressure time history on the tube surface is obtained by wind tunnel test, and the structural dynamic response is calculated by time history method. The analysis shows that, as a spatial structure, the g and D values of different responses in different positions are quite different and difficult to be directly applied, but combining with the time-history characteristics of each response, the structural characteristics of tower and tube and the design principle of reinforcement, The g value and D value of the tower tube can be simplified from the two dimensional distribution in the circumferential direction and the meridional direction to one dimensional distribution only along the meridian direction. The D value of each response can reach the practical range of engineering, but the usage is still inconsistent with the current design method. According to the independence of circular and meridional reinforcement design, and considering the different weights of wind-induced internal forces in structural design, the D value can only be distinguished between the circular internal forces and the meridional internal forces in practice. But the D value of the circumferential internal force is greater than that of the meridional internal force. At this time, the D value of the toroidal and meridional direction can be used as the wind vibration coefficient 尾 to participate in the structural design.
【作者單位】： 鄭州大學(xué)土木工程學(xué)院;同濟(jì)大學(xué)土木工程防災(zāi)國(guó)家重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金(51508523) 中國(guó)博士后科學(xué)基金(2014M552016)
【分類號(hào)】：TU311.3

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