摘要
为了研究某大型体育馆看台的自振特性,采用现场实测和数值模拟的方法对其竖向振动特性进行研究。由于看台具有对称性,故取其1/4分别布置96个测点(第1层看台)和88个测点(第3层看台)进行实测,采用环境激励和不测力法来识别看台结构的模态频率及振型。实测结果表明:第1层和第3层看台的实测第1阶竖向振动基频均为4.5 Hz;实测第1层和第3层看台的第3阶竖向振动频率分别为19.14 Hz和12.28 Hz,且均呈反对称振动形态,第1层看台实测第3阶竖向振动频率较第3层看台高55.8%;利用ANSYS有限元模拟结果与上述实测结果趋势基本一致,计算频率相对误差不超过12%;看台的主要振动发生于体育馆的北部。
In order to study the natural vibration characteristics of a large stadium stand, a modal field test and finite element analysis were carried out. Due to the symmetry of the stands, a quarter of the stand structures were measured. The first stand and the third stand were respectively arranged with 96 and 88 measuring points. The environmental incentive method and any force method were used to measure and identify the modal frequency and modal shape of the stand structures. The results show that the first-order vertical vibration frequencies of the first and the third stand are both 4.5 Hz. The third-order vertical vibration frequencies of the first and third stand are 19.14 Hz and 12.28 Hz respectively, and the modal shape of the third-order vertical vibration of the stands presents the ant-symmetric distribution. Moreover, the third-order vertical vibration frequency of the first stand is higher than that of the third stand about 55.8%. The results of the finite element simulation by using the ANSYS software are essentially identical in trend and the maximum error of the frequency between the calculation and the test is less than 12%. The main vibration occurs in the north parts of the stand.
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2013年第12期5025-5031,共7页
Journal of Central South University:Science and Technology
基金
国家自然科学基金资助项目(50878212)
关键词
体育馆看台
自振特性
有限元分析
土-结构相互作用
stadium stand
natural vibration characteristics
fmite-element analysis
soil-structure interaction
