基于初位移加载法和脉动法的单管通信塔模态测试与数值分析

Modal Test and Numerical Analysis of Single Tube Communication Tower Based on Pulsating Method and Initial Displacement Loading Method

为了获得实际单管通信塔的动力特性,基于初位移加载法和脉动法对一单管通信塔结构进行了现场动力特性测试,获得了其前三阶频率和一阶阻尼比。利用SAP2000软件建立了该结构有限元模型,获得了结构计算的自振频率。对比结构实测和数值计算可知:初位移加载法和脉动法测试单管塔的动力特性基本一致;结构实测与数值计算自振频率基本一致;实测阻尼比比规范规定的阻尼比小。

In order to obtain the dynamic characteristics of the actual single tube communication tower the field dynamic characteristics of a single tube communication tower structure were tested based on the initial displacement loading method and pulsating method and the first three mode frequencies and the first mode damping ratio were obtained.The finite element model of the structure was established by software SAP2000 and the calculated natural frequencies were obtained.Compared with the actual measurement and numerical calculation of the structure it could be found that the dynamic characteristics of the actual single tube communication tower measured by the initial displacement loading method and pulsating method are basically the same.The measured frequencies of the structure are basically the same as the numerical calculated frequencies.The measured damping ratio is smaller than that specified in the code.