高层强风现场实测若干基本问题的研究

发布时间：2019-06-15 02:47

【摘要】：由于现代高层建筑呈现出质量轻、柔性大、阻尼低等特点,其对风的敏感性也随着这一特征的放大而增加,高层建筑(尤其是沿海多台风地区的高层建筑)的风荷载研究变得越来越重要,风荷载已成为高层建筑结构设计的主要荷载之一。基于风灾的常年频发、高层建筑的飞速发展、高层建筑对风的敏感性比较大等因素,风与结构的相互作用以及高层建筑风致响应的研究已经成为时下最热门的研究课题之一。为此,对沿海地区的高层建筑开展抗风实测研究变得很有必要。本文基于沿海某高层建筑在强风“天兔”作用下实测风场风压数据,对高层强风现场实测几个基本问题进了分析研究,文章主要包括以下内容。首先,本文给出了几种台风异常数据甄别和处理的方法,择优采用格拉布斯方法对选取的3组异常实测风速样本进行了处理和分析,主要对比分析了处理前后数据在湍流度、阵风因子和功率谱密度函数3方面的特征,分析结果表明,在风速异常的时段,相对应的湍流度和阵风因子的值,经处理后的值较小;功率谱密度函数在低频段两者比较接近,但在高频段,处理前的谱值明显要大于处理后的谱值。其次,本文研究了实测建筑墙面的风压特性,具体探讨分析了各风压测点的脉动风压概率分布特征、脉动风压功率谱和风压的相关性。分析结果表明,测点位置、测点之间的距离、是否位于分离流区域对风压特性有较大影响。最后,基于迎风面的风场和风压数据,采用夹角余弦公式分别分析了在不同时距和不同来流风向角条件下,风场和风压的相关性,分析结果表明,当基本时距取为3s,来流风向垂直于结构迎风面时,同步实测风场同风压之间的相关性比较大。
[Abstract]:Because modern high-rise buildings have the characteristics of light weight, large flexibility and low damping, their sensitivity to wind increases with the amplification of this characteristic. The study of wind load in high-rise buildings (especially in coastal multi-typhoon areas) becomes more and more important, and wind load has become one of the main loads in the structural design of high-rise buildings. Based on the frequent occurrence of wind disasters, the rapid development of high-rise buildings, the sensitivity of high-rise buildings to wind and other factors, the interaction between wind and structure and the wind-induced response of high-rise buildings has become one of the most popular research topics. Therefore, it is necessary to carry out wind resistance measurement of high-rise buildings in coastal areas. Based on the measured wind pressure data of a coastal high-rise building under the action of strong wind "Tianyu", several basic problems of high-rise strong wind field measurement are analyzed and studied in this paper. the main contents of this paper are as follows. First of all, several methods of typhoon anomaly data identification and processing are given in this paper. The Grabbs method is selected to process and analyze the selected three groups of abnormal measured wind speed samples. The characteristics of the data in turbulence, gust factor and power spectral density function before and after processing are mainly compared and analyzed. The analysis results show that the corresponding turbulence degree and gust factor in the period of abnormal wind speed. The value after treatment is small. The power spectral density function is close to each other in the low frequency band, but in the high frequency band, the spectral value before treatment is obviously larger than that after treatment. Secondly, the wind pressure characteristics of the measured building wall are studied in this paper, and the probability distribution characteristics of fluctuating wind pressure at each wind pressure measuring point and the correlation between fluctuating wind pressure power spectrum and wind pressure are discussed and analyzed in detail. The analysis results show that whether the position of the measuring point and the distance between the measuring points are located in the separated flow area has a great influence on the wind pressure characteristics. Finally, based on the wind field and wind pressure data of the upwind surface, the correlation between the wind field and the wind pressure under different time distances and different wind direction angles is analyzed by using the angle cosine formula. The results show that when the basic time distance is 3s and the incoming wind direction is perpendicular to the upwind surface of the structure, the correlation between the synchronous measured wind field and the wind pressure is large.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU973.213

【引证文献】