CAJ | 학술논문

通过环境激励模态识别技术对一座中高层新结构大楼环境激励试验建模研究.首先介绍了试验模型设计,并在现场测量整栋大楼在环境激励下的振动响应.然后采用新发展的频率空间域方法(FSDD)进行模态识别,分别在0～4.5 Hz和0～6.5 Hz频率范围识别出9阶弯曲和扭转模态频率和振型.采用频率空间域方法识别了结构的阻尼特性, 并得到满意的结果.所得试验模型已成功应用于CFT大楼的有限元动态模型修正.所研发的试验建模技术可望在结构响应预报, 健康监测和振动控制中发挥重要作用.
통과배경격려모태식별기술대일좌중고층신결구대루배경격려시험건모연구.수선개소료시험모형설계,병재현장측량정동대루재배경격려하적진동향응.연후채용신발전적빈솔공간역방법(FSDD)진행모태식별,분별재0～4.5 Hz화0～6.5 Hz빈솔범위식별출9계만곡화뉴전모태빈솔화진형.채용빈솔공간역방법식별료결구적조니특성, 병득도만의적결과.소득시험모형이성공응용우CFT대루적유한원동태모형수정.소연발적시험건모기술가망재결구향응예보, 건강감측화진동공제중발휘중요작용.
Experimental modeling of a middle-rise office building via ambient modal identification is presented. A 200-DOF (Dimension of freedom) test model is designed to correlate with finite element mode. A newly developed frequency-spatial domain decomposition (FSDD) technique is used to identify modal characteristics of the full-size building by using ambient response measurements. In the interested frequency ranges of 0～4.5 Hz and 0～6.5 Hz altogether 9 bending and torsion modes are identified. As one of the major focuses of the project, the accurate damping estimation is conducted based on FSDD. The identified modal frequencies and mode shapes are utilized for finite element model tuning. Excellent agreement has been achieved with respect to the final tuned finite element (FE) model up to 9 modes.