某低矮模型房屋实测风场和风压的相关性研究

基于台风"菲特"影响下温州某低矮房屋的环境风场实测数据及该建筑物屋盖上的风压实测数据,对于风场特性和屋盖风压特性参数进行了计算分析.分析结果表明:随着平均时距的减小,平均风速最大值增大;湍流度随着平均风速的增大呈逐渐减小的趋势;建筑物屋面及屋面屋脊边缘处的平均风压均为较大的负压且脉动较大;根据风速和风压的变化趋势可以看出,风场风速与建筑物屋盖上风压呈现明显的相关性,进而在不同的时距条件下对风场风速与屋盖风压的相关性进行了分析,发现取5min为基本时距时风速与风压的相关性系数值较高,说明在确定结构的风荷载时取基本时距为5min更为合理.

Correlation Research of the Measured Wind Field and Wind Pressure of a Low-rise Building

This paper presented the analysis results of the wind field characteristics and wind pressure of the roof on the basis of the measurement data of the roof obtained in an instrumented low-rise building, which sits in Wenzhou and was affected by the typhoon Fitow. The results reveal that, with the decrease of the average interval, the maximal average wind velocity increases; the turbulence intensity tends to decrease with an increasing average wind velocity. Furthermore, the average wind pressure at the edge of the building roof and ridge is negative with large fluctuation. The variation tendencies of wind velocity and wind pressure show the obvious correlation between the velocity in wind field and wind pressure on the roof. The correlation analysis between the wind field characteristics and wind pressure on the roof was then conducted within different time intervals. The analysis results show that the wind velocity and wind pressure are correlated well at an average interval of 5 minutes, which indicates that the average interval of 5 minutes can be reasonably used to calculate the wind load.