【作者】 钱晓钫；

【导师】 陈朝晖；

【作者基本信息】 重庆大学 ， 结构工程， 2010， 硕士

【摘要】 随着科学技术的发展,土地需求的紧张,现代城市建筑的高度越来越高,建筑密度越来越大,以满足不断增长的人口对生活空间的需求。超高层建筑的修建同时也给结构的抗风设计带来了新的挑战,目前在规范上面没有具体给出超高层建筑的风荷载特性,要求对重要且体型复杂的建筑物和构筑物,应通过风洞试验确定其体型系数,用于实际结构设计[1]。同时,相邻建筑之间的干扰也对高层建筑风荷载特性产生很大的影响。本文以重庆天成大厦为研究背景,采用数值模拟和风洞试验相结合的方法,对超高层建筑的风荷载特性进行了研究,主要有以下几方面的工作:(1)基于Fluent 6.2软件平台,对天成大厦进行合理建模和分析,得出设计中可参考的直观风压云图,通过对云图的分析,得出数值模拟的天成大厦表面风压分布规律,并根据模拟结果指导风洞试验。(2)通过对天成大厦模型在模拟大气边界层风洞中的不同风向角下的风洞试验所得数据处理,分析了试验中结构在各种工况下的表面风压分布规律。(3)为考虑天成大厦周围建筑对该建筑的风荷载特性的影响,在数值模拟以及风洞试验中分别模拟了仅含该建筑单体以及包含天成大厦周围500米范围内的环境建筑两种情况,通过对比两种情况下天成大厦表面风压分布特征,分析了环境建筑对超高层建筑的风荷载特性的影响。(4)通过对风洞试验中天成大厦不同高度体型系数分析,研究了超高层建筑表面风压随建筑高度的变化规律。更多还原

【Abstract】 With the development of science & technology and the shortage of land requirement, the height and the density of modern city structures are getting higher and more in order to meet the need of increasing population. Meanwhile, it also brings a new challenge to the construction of super-high buildings, especially the way of wind engineering design. There is no concrete prescript for the wind load characteristic of the Super-high buildings at the present criterion, but there is a requirement which determine the shape coefficient of the Super-high buildings from the wind tunnel tests. At the same time, the surrounding buildings also influence the buildings’shape coefficient. This paper is based on the method of numerical simulation and wind tunnel test to study the wind character of the Super-high buildings, and its background is Chongqing Tiancheng Building. Main works include these following aspects:(1) Based on the software of Fluent 6.2, built the numerical model of Tiancheng Building and analyzed the model. Through analyzed the cloud picture of the building’s surface pressure distribution, got the disciplinarian of the surface pressure distribution on Tiancheng Building. This result can direct the wind tunnel test.(2) Through analyzed the result of the wind tunnel test at different wind angle, got the disciplinarian of the building’s shape coefficient.(3) In order to analyze the influence of the surrounding building to the wind character of Tiancheng Building, simulated two instances (only analyzed Tiancheng Building and analysed Tiancheng Building with the surrounding buildings which are not far away 500-meters from Tiancheng Building) in the numerical simulation and the wind tunnel test. Through compared the wind pressure character of the above two instance, analysed the influence of the surrounding buildings.(4) Through analyzed the building’s shape coefficient from the wind tunnel test at different high of Tiancheng Building, studied the disciplinarian of the shape coefficient as the change of the building high.更多还原