通讯塔钢结构动力特性的数值计算与现场测试  

Theoretical Analysis and Site Testing of the Dynamic Characteristics of Communication Tower Steel Structure

作　　者：周兆明[1] 夏懿琳 王磊[2] 杜麟龙 王军[1] 李明轩 徐淋 ZHOU Zhaoming;XIA Yilin;WANG Lei;DU Linlong;WANG Jun;LI Mingxuan;XU Lin(School of Mechanical Engineering,Southwest Petroleum University,Chengdu 610500,China;Safety Supervision Center,Petrochina Qinghai Oilfield Company,Dunhuang 736202,China)

机构地区：[1]西南石油大学机电工程学院,四川成都610500 [2]青海油田公司安全监督中心,甘肃敦煌736202

出　　处：《测试技术学报》2020年第1期61-67,共7页Journal of Test and Measurement Technology

摘　　要：通讯塔钢结构工作过程中,由于承受环境风载、振动等动载荷而容易发生共振,进而影响塔架的整体稳定性.位于天然气处理站旁的通讯塔,由于受到周围环境风载、压缩机及电机振动的影响,塔架螺栓连接易出现脱落.通讯塔现场检测评估需要对其动态特性进行检测分析.首先利用ANSYS仿真软件对通讯塔动态特性进行分析,得出通讯塔架的固有频率,然后采用环境随机振动激励法对其进行动力特性检测,利用模态软件对检测的振动信号进行分析处理,并建立模型,获取结构自振频率、振型、模态阻尼比.通过比较发现,测试获取的塔架固有频率与有限元仿真结果相差较小,由现场压缩机的振动频率与电机振动频率测试,进而获得是否发生共振的评价结果,同时依据测试结果修正有限元模型进行不同载荷下的应力分析.During the working process of the steel structure of communication tower,resonance is easy to occur due to the dynamic loads such as environment wind load and vibration,which affects the overall stability of the tower.Due to the influence of wind load,compressor and motor vibration in the surrounding environment,the bolt connection of the communication tower located next to the natural gas processing station is easy to fall off.On-site detection and evaluation of communication towers require detection and analysis of their dynamic characteristics.In this paper,ANSYS simulation software is used to analyze the dynamic characteristics of the communication tower,and the natural frequency of the communication tower is obtained.The dynamic characteristics of the structure are tested by random vibration excitation method.The vibration signals detected are analyzed and processed by modal software,and the model is established to obtain the natural frequency,modes and modal damping ratios of the structure.By comparison,the natural frequency of the tower obtained by the test is little different from the finite element simulation results.The vibration frequency of compressor and motor in the field is tested,so as to obtain the evaluation result of whether resonance occurs.Meanwhile,the finite element model can be modified according to the test results to conduct stress analysis under different loads.

关 键 词：通讯塔 模态分析 有限元模型 动力特性 环境随机振动激励法 

分 类 号：TU311.3[建筑科学—结构工程]