环境激励下ERA方法在砌体结构振动测试中的应用研究

Eigen-system realization algorithm used in the modal parameter identification of masonry structure based on ambient excitation

ERA方法是基于环境激励的结构振动测试的方法中重要的时域分析方法。主要由ERA算法对齐齐哈尔砌体结构居民房的基本模态参数进行测试。简述了ERA算法的主要思路和计算过程,介绍了相应的模态识别准则MAC,以及ERA算法在MATLAB中的实现。由ERA算法得到的模态参数与有限元建模分析结果分析比较吻合,为砌体结构在环境激励下用ERA方法测试模态参数提供了实验依据。最后,讨论了ERA方法与有限元建模分析结果出现差异的原因,以及ERA方法在环境激励下的限制和不足。

Eigen -system realization algorithm is an important time domain method for structural model parameter identification based on ambient excitation. The authors carry out the modal analysis and modal test for the masonry structure of Qiqihar by using ERA algorithm for data processing. The authors summary the main ideas and calcula- tion process of ERA algorithm, then introduce the corresponding MAC modal identification criterion and the way to realize ERA algorithm in MATLAB. And the analysis results of ERA algorithm meet the finite element method re- suits well. This paper provides an experimental basis for using ERA to test the modal parameters of masonry structure. Finally, the reason for the difference of results between the ERA algorithm and FEM modeling analysis is discussed, and the limitation of ERA method based on the ambient excitation is also discussed.