高耸塔式结构动力特性设计与测试  

Design and Measurement of Dynamic Characteristics of Tall Tower Structure

作　　者：吴泽玉[1] 王东炜[2] 王复明[3] 

机构地区：[1]华北水利水电大学土木与交通学院,郑州450045 [2]郑州大学土木工程学院,郑州450000 [3]郑州大学水利与环境学院,郑州450000

出　　处：《振动．测试与诊断》2017年第1期153-157,共5页Journal of Vibration,Measurement & Diagnosis

基　　金：国家自然科学基金资助项目(50978232);河南教育厅资助项目(14B560029);华北水利水电大学高层次人才基金资助项目(201246)

摘　　要：为了满足上置设备工作需要,高耸塔式结构基频要大于某一给定数值。通过对结构基频计算公式和结构变形曲线分析,增大结构基频应以降低结构顶部质量和提高结构底部刚度为主的频率调整基本原则。基于空间有限元理论,通过模态分析获得了结构的频率和振型。利用环境激励下结构振动模态参数识别方法对雷达塔进行动力检测。采用模态识别法求出结构的前三阶频率、振型和阻尼值。引入模态置信因子和标准化模态差准则,对计算振型数据和实测振型数据进行分析比较,以验证有限元计算的准确性。该研究成果为深入研究高耸塔式结构频率调整、准确预测结构的动力响应提供可靠依据。In order to meet the equipment work on the building, the natural frequency of a high-rise tower structure should be greater than a certain value. The basic principles of structure frequency adjustment are to reduce the top mass of the structure and improve the bottom stiffness of the system, through the analysis of the fundamental frequency calculation formula and structure deformation curve. Based on the spatial finite element theory, we obtained the frequency and mode shapes of the structure through modal analysis. We used the ambient excitation identification method to test the dynamic property of the radar tower, and used the modal parameter identification method to identify the first three order frequencies, mode shapes and damping ratio of the structure. Then, we introduced modal assurance criteria and a normalized mode difference criterionto analyze and compare the calculated mode and the measured data. The results provided a reliable basis for further accurate predictions of the tower structure dynamic response and frequency adjustment. © 2017, Editorial Department of JVMD. All right reserved.

关 键 词：动力特性 现场测试 模态置信因子 标准化模态差准则 功率谱 

分 类 号：TU355[建筑科学—结构工程] TH123[机械工程—机械设计及理论]