格构式塔架横风向脉动风荷载空间相关性研究  

Spatial correlation of across-wind wind fluctuating wind load of a lattice tower

作　　者：李峰 邹良浩[1] 梁枢果[1] 陈寅 LI Feng;ZOU Lianghao;LIANG Shuguo;CHEN Yin(School of Civil Engineering,Wuhan University,Wuhan 430072,China;Central-southern China Electric Power Design Institute Co.,Ltd.,China Power Engineering Consulting Group,Wuhan 430071,China)

机构地区：[1]武汉大学土木建筑工程学院,武汉430072 [2]中国电力工程顾问集团中南电力设计院有限公司,武汉430071

出　　处：《振动与冲击》2020年第5期25-31,共7页Journal of Vibration and Shock

基　　金：国家自然科学基金(51078296)。

摘　　要：为了研究格构式塔架横风向脉动风荷载的空间相关性,基于某实际格构式塔架2个典型节段模型同步高频测力天平风洞试验和同步风速测试风洞试验,测得了模型基底剪力、弯矩和风速时程,通过数据处理方法得到了其横风向脉动风荷载及脉动风速的相干函数。在此基础上,分析比较了脉动风荷载及脉动风速的相干函数特点与变化规律。结果表明:格构式塔架横风向风荷载相干函数与频率,水平距离和竖向距离均有关;格构式塔架横风向风荷载相干函数与现有高层建筑及锥形烟囱等结构的结果存在一定差别。最后,运用非线性最小二乘法拟合得到了脉动风荷载相干函数经验公式,拟合公式与试验结果较吻合,可为分析格构式塔架横风向风荷载及风致响应提供一定的参考。Here,to study spatial correlation of across-wind fluctuating wind load of a lattice tower,based on two typical segmental models of a certain lattice tower’s synchronous high-frequency force-measuring balance wind tunnel tests and synchronous wind speed measuring wind tunnel tests,two models’base shear force,bending moment and wind speed time histories were measured.Coherence functions of across-wind fluctuating wind load and fluctuating wind speed were calculated with the data-processing method,and these coherence functions’characteristics and variation laws were analyzed contrastively.The results showed that coherence function of across-wind fluctuating wind load of a lattice tower is related to frequency,horizontal distance,and vertical distance;there is a certain deviation between this coherence function and those of existing high-rise buildings and conical chimneys.Finally,the nonlinear least square method was used to deduce the empirical formula for across-wind fluctuating wind load coherence function.It was shown that the calculation results with this fitted formula agree well with test ones;the study results provide a reference for analyzing across-wind fluctuating wind load and wind-induced response of lattice towers.

关 键 词：格构式塔架 横风向 脉动风荷载 相干函数 高频测力天平 

分 类 号：TU312.1[建筑科学—结构工程]