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（同濟(jì)大學(xué)土木工程防災(zāi)國(guó)家重點(diǎn)實(shí)驗(yàn)室，上海 200092）
［摘要］在不影響冷卻塔冷卻性能的前提下，對(duì)雙曲冷卻塔塔筒下部半徑和下支柱斜率進(jìn)行微調(diào)，并分析了其對(duì)結(jié)構(gòu)動(dòng)力特性、承載性能及穩(wěn)定性的影響。研究表明，塔筒下部子午線形對(duì)結(jié)構(gòu)的線性特征值屈曲分析結(jié)果影響甚微，下支柱斜率等于或略小于塔筒下緣斜率可以有效提高結(jié)構(gòu)基頻，提高其抗風(fēng)性能。塔筒下部區(qū)域斜率的突然下降或持續(xù)快速下降均會(huì)使附近環(huán)向膜應(yīng)力及環(huán)向位移發(fā)生突變，也因此可能使局部穩(wěn)定無(wú)法滿足要求。所以，在設(shè)計(jì)中應(yīng)保證塔筒下部區(qū)域的子午向斜率與上部斜率一致緩慢下降，使應(yīng)力分布連續(xù)平緩，同時(shí)又可在不增加壁厚的情況下滿足局部穩(wěn)定要求。
［關(guān)鍵詞］雙曲冷卻塔；塔筒子午線形；動(dòng)力特性；承載性能；局部穩(wěn)定
中圖分類號(hào)：TU33+2,TU271-1文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2012)02-0118-04
Effect of bottom meridian curve on the mechanics behavior of hyperboloidal cooling tower
Zhang Junfeng, Ge Yaojun, Zhao Lin(State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China)
Abstract:Radius of the bottom shell and slope of the support columns were optimized without influencing on the cooling property of hyperboloidal cooling tower, and the effect on dynamic behavior, load-carrying properties and local buckling performance were analyzed. It’s shown that the meridian curve of bottom shell has little influence on the linear bifurcation buckling results, and the fundamental frequency can be improved if the slope of the support columns is equal or slightly less than the slope of the bottom shell’s edge. Abrupt or sustaining fast decline of the slope of bottom shell will cause abrupt changes on the latitude membrane stress and latitude displacement, and the local buckling may not be satisfied consequently. Therefore, the slope of the bottom shell should decline slowly according the adjacent shell, so the stress distribution will be continuous and the local buckling can be satisfied without any increase of the shell’s thickness.
Keywords:hyperboloidal cooling tower; meridian curve; dynamic behavior; load-carrying property; local buckling
*科技部重大科技項(xiàng)目（2008ZX06004-001）和國(guó)家自然科學(xué)基金項(xiàng)目（50978203）聯(lián)合資助。
作者簡(jiǎn)介：張軍鋒，博士研究生，Email: brilliantshine@163.com。
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