【摘要】 利用频域-空间域分解法,建立桥梁运行模态识别方法。该方法对桥梁在实际运行状态下车辆激励的响应测量数据进行无偏功率谱估计;然后采用奇异值分解技术,将随机响应数据空间分解成信号和噪声2个子空间,得出模态指示函数;并利用空间模态滤波技术分离出单一模态,准确识别出桥梁结构的模态参数。通过对杨浦大桥进行动力试验,测试桥梁在环境激励下的振动信息,采用该方法分析得到桥梁结构的动力参数,并与有限元计算结果相对比,有效实现了对桥梁结构整体状态和工作性能的评估。更多还原

【Abstract】 Operational modal analysis method of bridge was built based on frequency domain and spatial domain decomposition.Responding signal excited by traveling vehicles was utilized to analyze unbiased power spectrum.Then singular value decomposition was adopted to separate the signal space from the noise space to obtain the modal indicator function.Single mode was then separated by spatial modal filtering technology,and bridge modal parameters were discerned.Dynamic loading test of Yangpu Bridge was carried out to measure vibration signals excited by ambient excitation,then the bridge dynamic parameters were obtained and compared with computing result of finite element method,which estimated the bridge load bearing capacity and condition effectively.更多还原