摘要
文章首先详细介绍了模态分析与模态参数识别的原理,并介绍了现场环境脉动实验概况,利用模态参数识别方法进行桥梁动力参数识别;利用大型有限元软件建立了全桥三维有限元模型,并进行了参数修正,理论和实验模态分析结果具有较好的吻合程度。此类测试和分析可以提供结构健康监测的基准模型,服务于结构状态评估和修复。
The paper presents the theory of analytical modal analysis. The field test is carried out conducting ambient vibration testing under traffic-induced excitation. The analytical modal analysis method is used for the output-only modal identification. A good agreement in identified frequencies has been found among these methods. The 3-D finite element models (FEM) are constructed and an analytical modal analysis is then performed to generate natural frequencies and mode shapes in the 3-orthogonal directions. The finite element model is validated to match the field natural frequencies and mode shapes of the bridge. It is further demonstrated the results from the FEM agrees well with the field tests and can serve as a baseline model in the seismic evaluation/retrofit of the bridge.
出处
《建筑监督检测与造价》
2010年第5期13-15,21,共4页
Supervision Test and Cost of Construction
关键词
简支梁桥
模态分析
环境振动
系统识别
有限元方法
Simply supported girder bridge
Modal analysis
ambient vibration
system identification
finite element method.
