摘要
在输出功率谱的基础上建立了桥梁运行模态分析方法——频域分解法。该方法利用来往车辆激励的响应测量数据,进行无偏功率谱分析,然后对响应谱矩阵进行奇异值分解来识别桥梁的模态参数。该方法保留了传统频域法快速简便的特点,还可以解决传统频域法不能识别近频和重频模态的问题。通过实桥测试,证明该方法可用于桥梁承载力和使用状况评估。
A new operational analysis method named frequency domain decomposition was built based on outputting power spectrum,Responding signal excited by traveling vehicles was utilized to analyze unbiased power spectrum.Then bridge modal parameters could be discerned through singular value decomposition of response spectrum,It is not only simple,convenient and quick as traditional frequency domain method,but also could discern closed and overlapped modals.In the end,a real bridge test proved that the method could be used to estimate bridge load bearing capacity and condition.
出处
《现代交通技术》
2007年第3期42-44,48,共4页
Modern Transportation Technology
关键词
桥梁工程
状态评估
运行模态
频域分解
bridge engineering
state assessment
operational modal
frequency domain decomposition
