基于随机子空间法的城市桥梁模态参数识别研究与程序开发

Research on Modal Parameter Identification and Program Development of Urban Bridge Based on Stochastic Subspace Method

近年来,在桥梁结构安全性状鉴定研究中,基于环境激励的随机子空间模态分析法(SSI)研究较多。论文在城市桥梁模态参数识别中应用随机子空间算法(SSI),基于SSI理论采用Matlab软件开发出工程结构模态分析软件(MAES);以有限元仿真简支桥梁模型、市内某单跨人行天桥工程为依托,计算出模态频率的理论值,同时实测出基于随机子空间法的模态频率值进行对比和验证。研究表明,两者吻合度较高,随机子空间法在城市桥梁模态参数识别中应用价值较高。

Currently,the method of stochastic subspace modal analysis(SSI)based on ambient excitation has become a research hotspot in the territory of bridges safety testing.In this paper,the stochastic subspace method is applied to the identification of modal parameters of urban bridges,and the engineering structure modal analysis software(MAES)based on the stochastic subspace method is developed by using the Matlab software.Theoretical modal frequency value and the measured value of the modal frequencies were compared by simply supported beam bridge finite element simulation and city skywalk project examples were calculated.The research shows that the random subspace method can accurately identify the modal parameters of the urban bridges.