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

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.