大跨度球面网壳结构风力荷载间歇特性研究

发布时间：2019-01-15 07:35

【摘要】：针对典型大跨度球面网壳结构,在同济大学TJ-3大气边界层风洞试验室进行了刚性模型测压试验.首先,利用游程分析方法验证了风力信号的非平稳特性.其次,使用离散小波变换对其1∶200的模型结构风力信号在各尺度进行分解,得到各尺度小波系数时程曲线.为量化分析风力间歇特性,对尺度能量分布,间歇因子及间歇能量分布进行了分析和比较.研究表明:风场类型对阻力系数及Z向升力系数的平稳特性,以及对高尺度区间歇能量比率及间歇因子影响较大,而对各尺度风力系数尺度能量比率的影响均较小.各尺度下,整体阻力系数与Y向升力系数呈现正相关,而与Z向升力系数呈现负相关,并且整体阻力系数与Y向升力系数的相关性随着尺度增大而增大.
[Abstract]:For typical long-span spherical reticulated shell structures, rigid model pressure measurement tests were carried out in the TJ-3 atmospheric boundary layer wind tunnel laboratory of Tongji University. Firstly, the non-stationary characteristics of wind signal are verified by run-length analysis method. Secondly, the discrete wavelet transform is used to decompose the wind signal of the model structure of 1: 200 at each scale, and the time-history curve of wavelet coefficients of each scale is obtained. In order to quantitatively analyze the intermittent characteristics of wind, the scale energy distribution, the intermittent factor and the intermittent energy distribution are analyzed and compared. The results show that the type of wind field has great influence on the stationary characteristics of drag coefficient and Z-direction lift coefficient, as well as on the intermittent energy ratio and intermittent factor in high scale region, but has little effect on the scale energy ratio of each scale wind coefficient. At each scale, the overall drag coefficient is positively correlated with the Y-direction lift coefficient, but negatively correlated with the Z-direction lift coefficient, and the correlation between the global resistance coefficient and the Y-direction lift coefficient increases with the increase of the scale.
【作者单位】：重庆交通大学山区桥梁与隧道工程国家重点实验室培育基地;同济大学土木工程防灾国家重点实验室;
【基金】：国家自然科学基金资助项目(51378396) 中国博士后科学基金资助项目(2014M560706)~~
【分类号】：TU399;TU312.1

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