项目名称： 子午线型对冷却塔结构特性和抗风性能的影响机理

项目编号： No.51508523

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 建筑环境与结构工程学科

项目作者： 张军锋

作者单位： 郑州大学

项目金额： 20万元

中文摘要： 双曲冷却塔的子午线型对结构特性和抗风性能存在显著影响，不合理的子午线型也被认为是渡桥电厂风毁事故的原因之一。线型对结构特性和抗风性能的影响形式已有零星发现，但并不系统全面，对影响机理还没有明确认识，阻碍了冷却塔线型设计和优化工作的开展，亦不利于我国当前高涨的建设实践。本项目拟通过数值计算，对比分析子午线型参数对结构特性的具体影响形式和关键影响因素，包括其力学行为模式、动力特性、稳定性以及整体和局部刚度特征等；借助板壳结构力学理论分析，明确线型参数对结构特性的影响机理。以此为基础上升到冷却塔抗风性能的两个关键问题，风振响应和极限承载能力：经刚体和气弹模型风洞试验和风致动力响应分析，考虑线型和动力参数，揭示子午线型对风振响应的影响规律；通过数值仿真模拟，分析子午线型对风荷载极限承载能力和破坏模式的影响；并将两者结合展开针对在役非完善结构的风振响应研究。最终结合实际设计过程探究线型优化策略。

中文关键词： 双曲冷却塔；子午线型；结构特性；抗风性能；线型优化

英文摘要： Meridian curves have great influences on the structure behaviors and wind-resistant performance of hyperboliodal cooling towers. The defective meridian curve was also regarded as one of the reasons resulting in Ferrybridge accident. There have been some fragmentary findings about these influences but not comprehensive, and the influence mechanism is quite far beyond our perception. This obstructs the pursuing for optimized meridian curves and is not favorable for the flourishing construction of cooling towers. In this project, numerical methods will be employed to give comprehensive comparative study on the structure behaviors firstly, including the mechanical behavior, dynamic properties, buckling behavior, global and local stiffness, from which the critical parameters of meridian curves would be picked up and the influence patterns would be found out. Then, the influence mechanism of meridian curves on the structure behaviors of hyperboloidal cooling towers would be recognized, according to those previous findings and theoretical analyses based on structure mechanics of plate and shell. Based on the comprehensive understanding of the structure behaviors, rigid and aeroelastic model tests followed by dynamic response analysis would be conducted to peruse the influence of meridian curves on wind induced vibration responses, in which meridian curve and dynamic property parameters would be included. On the other hand, the ultimate wind loads and failure mode of hyperboloidal cooling towers would be obtained from numerical simulation, and the influence from meridian curves would also be studied. Then based on the wind induced vibration and ultimate wind loads analysis, wind induced vibration study on imperfect structures would be conducted. Finally, the optimizing strategy would be proposed based on the above fundamental study and the practical design process.

英文关键词： hyperboloidal cooling towers;meridian curves;structure behaviors;wind-resistant performance;optimization