基于时序分析法的城市桥梁模态参数识别与软件开发研究

Research on Modal Parameter Identification and Software Development of Urban Bridges Based on ARMA Model

当前,城市桥梁交通繁忙,在复杂恶劣的环境作用下桥梁结构极易出现损伤。因而,准确鉴定桥梁的结构安全状况,是建筑安全检测机构的重要课题。基于环境激励的模型时序分析法(ARMA)由于操作简便成为近年来的研究热点,该方法能够有效地从环境激励的结构响应中获取模态参数。本文将ARMA法应用到城市桥梁的模态参数识别中,并采用Matlab商用数学软件开发了基于ARMA法的工程结构模态分析软件(MAES)。文中采用简支梁桥有限元仿真模拟、城市人行天桥工程实例两案例分别计算理论模态频率值与基于ARMA法的实测模态频率值进行对比研究。研究表明,ARMA法能够准确地识别城市桥梁模态参数,本文基于Matlab软件开发的模态分析软件(MAES)具有较高的实用价值。

Currently,heavy traffic urban bridges in complex and harsh environments prone to structure damage. Therefore,to accurately identify the structural safety of the bridge situation is an important task of building safety testing organizations. The method of time series method（ARMA） based on ambient excitation has become a research hotspot in recent years because of its simple operation. The method can effectively obtain the modal parameters from the structural response of environmental excitation. In this paper,the time series method was applied to the identification of modal parameters of urban bridges,and the engineering structure modal analysis software（MAES） based on the time series method was developed by using 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 showed that the time series method could accurately identify the modal parameters of the urban bridges. The modal analysis software（MAES） based on Matlab software has a high practical value.