输电杆塔阵风响应实测与准静态设计研究  

Field measurement and quasi-static studies on gust response of transmission tower

作　　者：李宏男[1] 白海峰[2] 伊廷华[1] 任亮[1] 

机构地区：[1]大连理工大学海岸与近海工程国家重点实验室,大连116024 [2]大连交通大学土木与安全工程学院,大连116028

出　　处：《振动与冲击》2010年第8期17-21,共5页Journal of Vibration and Shock

基　　金：国家自然科学基金重点项目(50638010);教育部创新团队(IRT0518);高等学校博士点基金(20060141027)

摘　　要：为分析输电塔的动力特性和阵风响应因子的变化规律,在现场风荷载条件下,对作用于新建输电塔的脉动风速及其各部位加速度和基底动应变响应进行了同步实测。采用模态识别法和有限元法对输电塔的动力特性进行了对比分析;采用实测数据直接分析法和不同的准静态法分别计算了基于塔顶位移和基底弯矩的阵风响应因子。结果表明,实测数据的模态识别法与有限元法得到的输电塔动力特性相吻合,有限元数值分析正确有效;实测数据分析法与准静态法得到的阵风响应因子的变化规律相同,且与脉动风速的均值和湍流强度相关;基于弯矩的阵风响应因子吻合较好,各种方法的计算值相差在5%以内;基于实测位移的阵风响应因子与准静态法差异较大,其原因有待于进一步试验研究的检验与识别。In order to clarify the variational rules of dynamic properties and gust response factors of transmission tower,the synchronous measurements of the fluctuating wind speed acting on the just built transmission tower,together with its accelerations responses located at different parts and the base bending moments were carried out under field wind condition.The dynamic properties of transmission tower obtained by test were compared with those by mode identification method and finite element method respectively.The gust response factors based on the top displacement and base bending moment were calculated respectively with direct analytical method using test data and various quasi-static methods.The results show that:the dynamic properties obtained by the mode identification method based on measurement data are in good agreement with those by finite element method,which indicates that the numerical results using finite element method are correct.The changing rule of gust response factors obtained by the measurement data analysis is consistent with that by the quasi-static analysis,and is related to the mean velocity and turbulence intensity of fluctuating flow.The gust response factors based on bending moment are almost identical by use of various methods,the differences among them do not exceed 5%.In turn,the gust response factors based on measurement displacement analysis differ from those calculated by quasi-static method,and it is necessary to further identify and verify its causations.

关 键 词：输电杆塔 动态测试 模态识别 有限元分析 动力特性 阵风响应因子 

分 类 号：TU34[建筑科学—结构工程]