遮挡型格构式塔架风力特性试验研究  

Tests for wind force on occluded latticed towers

作　　者：李正良[1,2] 刘欣鹏[1] 晏致涛[1,2] 肖正直[1,2] 俞登科[1] 

机构地区：[1]重庆大学土木工程学院,重庆400045 [2]重庆大学山地城镇建设与新技术教育部重点实验室,重庆400045

出　　处：《振动与冲击》2015年第11期99-104,共6页Journal of Vibration and Shock

基　　金：国家自然科学基金(51308568)

摘　　要：基于高频天平测力技术,对遮挡型格构式塔架模型进行不同遮挡距离、不同试验风速下的风洞试验,研究其对遮挡型格构式塔架顺风向、橫风向、扭转向平均风力系数以及对顺风向、橫风向基底弯矩功率谱的影响,并在此基础上利用最小二乘法对两个方向的功率谱进行了参数拟合。结果表明,遮挡距离是影响平均风力系数的重要影响因素,而试验风速仅对橫风向平均风力系数有影响;与平均风力系数相反,对于基底弯矩功率谱而言,试验风速对其影响显著,而遮挡距离在整个频段上对功率谱密度影响并不大;特定工况下极值脉动功率谱拟合效果较好,可用于遮挡型格构式塔架动力响应的频域计算中。Based on high-frequency-force-balance technique,a model of an occluded latticed tower was tested in a wind tunnel under conditions of 3 kinds of wind speed,and 6 kinds of occluding distance to investigate mean force coefficients and power spectral densities（PSDs）of base moment.Based on these results,the analytical models of PSD for the base moment in two directions were fitted by applying the least-square method.It was shown that the occluding distance is an important factor to affect mean force coefficients;however,the wind speed is an important factor to affect PSDs of base moment;the analytical models of PSD of base moment agree well with the experimental results obtained with wind tunnel tests,they can be used to calculate wind-induced dynamic responses of occluded latticed towers in frequency domain.

关 键 词：遮挡型格构式塔架 风洞试验 风力系数 功率谱 解析模型 

分 类 号：TU279.744[建筑科学—建筑设计及理论] TU973.213