摘要
基于灌河大桥健康监测系统,选取灌河大桥良态气候条件下主跨跨中和塔顶风速仪监测数据,分析比较了自相关函数法、指数衰减法、AR模型法、功率谱法等四种常用方法计算湍流积分尺度的效果及其可靠性,分析了湍流积分尺度与平均风速及湍流强度之间的关系,给出了湍流积分尺度的长期统计结果。结果表明:不同湍流积分尺度计算方法得到的湍流积分尺度有一定差异,并且纵向湍流积分尺度与横向湍流积分尺度的比值差异较大;湍流积分尺度与平均风速没有确定性关系,纵向湍流积分尺度有随着湍流强度增大而增大的趋势,横向湍流积分尺度与湍流强度无明显关系;不同高度上,塔顶湍流积分尺度大于跨中湍流积分尺度,不同方向上,纵向湍流积分尺度比横向湍流积分尺度大。
With the monitoring data of anemometers under conventional climate in the Guanhe bridge field, four commonly used methods for calculating turbulence integral scale are investigated to verify their own reliability. The relationship between turbulence integral scale with mean wind speed and turbulence intensity is analyzed, long-term statistical results of turbulence integral scale is presented. Results show that different method led to different calculation result and different ratio of longitudinal turbulence integral scale and lateral turbulence integral scale. There is no certain relationship between turbulence integral scales with mean wind speed. Longitudinal turbulence integral scale has a same increasing trend with turbulence intensity, and no significant relationship is found for lateral turbulence integral scale and turbulence intensity. The turbulence integral scale with tower measured data is larger than of middle of the bridge main span, the longitudinal turbulence integral scale is larger than than that of the lateral.
出处
《结构工程师》
北大核心
2016年第2期75-83,共9页
Structural Engineers
基金
国家自然科学基金资助项目(51378112)
关键词
结构健康监测
湍流积分尺度
平均风特性
湍流强度
structural health monitoring, turbulence integral scale, mean wind characteristics, turbulence intensity
