西安理工大学学报2017，Vol.33Issue(4)：413-418,6.DOI:10.19322/j.cnki.issn.1006-4710.2017.04.007
高强钢组合偏心支撑振动台试验模态参数识别方法研究
Modal parameter identification of shaking table test of eccentrically braced frames with high strength steel combination
摘要
Abstract
In order to understand the dynamic characteristics of the structure model and its changes in the whole test,the method for the stochastic subspace identification (SSI) using the acceleration records in the process of shaking table test directly is presented to identify the structural modal parameters.The frequency,damping and vibration mode of the three-storey K-shaped eccentrically braced frames with high strength steel combination are obtained.The results show that the error of the natural frequency is very small,the maximum margin of error is of 4 percentage points,and that the damping identification results are more stable and closer to the experiment phenomenon compared with the method of peak picking (PP) recognition results.It turns out that the SSI method can identify the structural modal parameters after each input in the process of the shaking table test,overcoming the issues such as the traditional approach to identifying that the damping is not stable,with sometimes error unexpected.It is of theoretical significance and practical value in understanding the dynamic characteristics of structure model.关键词
随机子空间法/振动台试验/模态参数识别/峰值拾取法/高强钢组合偏心支撑Key words
stochastic subspace identification/shaking table test/modal parameter identification/peak picking recognition/eccentrically braced frames with high strength steel combination分类
建筑与水利引用本文复制引用
田小红,苏明周,杨水成..高强钢组合偏心支撑振动台试验模态参数识别方法研究[J].西安理工大学学报,2017,33(4):413-418,6.基金项目
国家自然科学基金资助项目(51178382) （51178382）
