【作者】 郑庆星；

【导师】 傅继阳；

【作者基本信息】 广州大学 ， 结构工程， 2011， 硕士

【摘要】 随着我国城市化进程的推进,城市人口高度集中,高层建筑进入了一个快速发展的时期。高层建筑具有质量轻、柔性大、阻尼小、自振频率低等特点,风荷载往往是结构设计的控制荷载。风洞试验与原型实测是风工程研究的主要方法,本文以广州利通广场为例对此展开研究,主要内容包括：1.在刚性模型测压风洞试验与高频底座天平试验的基础上,计算了结构的基底倾覆弯矩、顶部峰值加速度以及等效静风荷载,对比分析了测压试验结果与天平试验结果,验证了试验数据的可信度,从而为高层建筑的结构抗风设计提供参考依据。2.台风登陆时,在高层建筑顶部进行长时间连续风场监测,利用获得的实测数据,系统地研究了台风的脉动风概率分布、功率谱和湍流积分尺度等台风相关特征,以及湍流强度、阵风因子的自身特征及其与平均风速之间的相互关系,将为我国在台风作用下风环境、风场模拟、设计风荷载等方面的研究提供有价值的成果。3.在台风影响下,同步测试结构顶部风速和风振响应,利用风振响应数据研究了台风作用下被测结构的自振频率、加速度均方根和阻尼特征等,并分析结构振动响应长期观测数据,总结结构在施工过程中自振频率的变化特征,从而为高层建筑自振频率的识别提供参考标准。更多还原

【Abstract】 With the rapid urbanization and centralization of city population in china, more and more tall buildings have developed in recenet years. As tall buildings have the characteristics of light mass, more flexibility, small damping and low natural frequencies, wind load has become the controlling load for the structural design of such tall buildings. As we know, wind tunnel test and field measurement are two major methods for wind engineering society. Taking Guangzhou Leatop Plaza as an example, the wind effects on this tall building was comprehensively studied in this dissertation by these two methods. The main content of this dissertation were listed as the following:1. First the Multiple Point Synchronous Scanning (MPSS) test of wind pressure and High-Frequency Force Balance test (HFBB) were conducted in the wind tunnel. The overturning moments at basement, peak acceleration response atop of the building and equivalent static wind load (ESWL) for this tall building were analyzed based on the wind tunnel data. A comparison of wind-induced responses has been made between these two wind tunnel test methods. The reliability of the test data has been verified.The analyzed results from wind tunnel tests would establish the valuable reference for the wind resistant design of such tall buildings.2. A continuous structural vibration monitoring was conducted for a long-term period when typhoon affected this tall building.The field measured data about the typhoon characteristics atop the building was obtained. The statistically results about the probability distribution, power spectrum density and turbulence integral scale of fluctuating wind speed were analyzed. Furthermore, the relationship between turbulence intensities, gust factors and wind speed were also studied in this project.The analyzed results would provide valuable information for further research into wind climate, wind field simulation, and wind load design.3. During the typhoon affected this tall building, wind speed atop of the building and wind-induced responses were measured and recorded synchronously.The dynamic characteristics including natural frequencies, damping ratios and wind-induced acceleration response have been analyzed for this tall building based on the measured data.Thus information about the wind effects on this tall building was obtained comprehensively. Furthermore the variation of identified natural frequencies of this tall building during the construction process was also analyzed to provide the more information of dynamic characteristic of such tall buildings in various construction stages.更多还原