【摘要】：為明確冷卻塔結(jié)構(gòu)的振型特征、不同振型在地震響應(yīng)中貢獻(xiàn)及地震內(nèi)力環(huán)向分布特點,便于冷卻塔結(jié)構(gòu)設(shè)計,以某大型雙曲冷卻塔為例,在動力特性分析基礎(chǔ)上采用反應(yīng)譜方法進(jìn)行地震響應(yīng)計算,并與其它荷載作用下內(nèi)力進(jìn)行對比。研究表明,冷卻塔振型可據(jù)其形狀、方向分為環(huán)向與子午向諧波耦合振型、側(cè)向彎曲振型、豎向伸縮振型及豎向扭轉(zhuǎn)振型4類。第1類振型為冷卻塔主振型;水平、豎向地震響應(yīng)貢獻(xiàn)分別來自第2、3類振型,第1、4類振型對地震作用均無貢獻(xiàn)。側(cè)彎振型的截面變形特征決定水平地震作用下塔筒內(nèi)力在環(huán)向呈正弦或余弦分布。無論水平或豎向地震作用,塔筒中主要產(chǎn)生雙向軸力,在下支柱主要產(chǎn)生軸力及彎矩,且水平地震作用產(chǎn)生的內(nèi)力遠(yuǎn)大于豎向地震。較其它荷載作用效應(yīng),地震作用對塔筒的關(guān)鍵效應(yīng)為塔筒中下區(qū)段內(nèi)子午向拉力及塔筒頂端0.2HS范圍內(nèi)環(huán)向拉力,且地震效應(yīng)對下支柱影響明顯大于對塔筒影響。
[Abstract]:In order to clarify the mode characteristics of cooling tower structure, the contribution of different vibration modes to the seismic response and the characteristics of the internal force distribution in the earthquake are convenient for the structural design of the cooling tower. A large hyperbolic cooling tower is taken as an example. Based on the analysis of dynamic characteristics, the response spectrum method is used to calculate the seismic response, and the results are compared with the internal forces under other loads. The results show that the vibration modes of cooling tower can be divided into four types according to their shape and direction: toroidal and meridional harmonic coupling mode lateral bending mode vertical telescopic mode and vertical torsional mode. The first type of mode is the main mode of cooling tower, and the contribution of horizontal and vertical seismic response comes from the second and third types of vibration respectively, and the first and fourth type of vibration have no contribution to seismic action. The cross section deformation characteristics of lateral bending mode determine the sinusoidal or cosine distribution of the inner force of the tower tube under horizontal earthquake. No matter horizontal or vertical seismic action, the axial force is mainly produced in the tower and tube, the axial force and bending moment are mainly produced in the lower pillar, and the internal force produced by horizontal earthquake is much larger than that by vertical earthquake. Compared with other load effects, the key effects of seismic action on the tower tube are meridian tension in the middle and lower section of the tower tube and inner circular tension force in the 0.2HS range at the top of the tower tube, and the influence of seismic effect on the lower pillar is obviously greater than that on the tower tube.
【作者單位】： 鄭州大學(xué)土木工程學(xué)院;
【基金】：中國博士后科學(xué)基金(2014M552016)
【分類號】：TU347;TU311.3

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本文編號：2256371