（同济大学土木工程防灾国家重点实验室，上海 200092）
［摘要］在不影响冷却塔冷却性能的前提下，对双曲冷却塔塔筒下部半径和下支柱斜率进行微调，并分析了其对结构动力特性、承载性能及稳定性的影响。研究表明，塔筒下部子午线形对结构的线性特征值屈曲分析结果影响甚微，下支柱斜率等于或略小于塔筒下缘斜率可以有效提高结构基频，提高其抗风性能。塔筒下部区域斜率的突然下降或持续快速下降均会使附近环向膜应力及环向位移发生突变，也因此可能使局部稳定无法满足要求。所以，在设计中应保证塔筒下部区域的子午向斜率与上部斜率一致缓慢下降，使应力分布连续平缓，同时又可在不增加壁厚的情况下满足局部稳定要求。
［关键词］双曲冷却塔；塔筒子午线形；动力特性；承载性能；局部稳定
中图分类号：TU33+2,TU271-1文献标识码：A文章编号：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
*科技部重大科技项目（2008ZX06004-001）和国家自然科学基金项目（50978203）联合资助。
作者简介：张军锋，博士研究生，Email: brilliantshine@163.com。
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