建立适用于竖向荷载作用下系统识别的斜拉桥简化模型

amage identification based on vibration data is one of the essential technique of Structural Health Monitoring (SHM), the key is to accurately and effectively carry out structural system identification. Although, there are a lot of analysis methodologies available in the literature for system identification, most of them work on either simple structures or structures with small degree-of-freedom (DOF). Therefore, in order to apply these techniques to large and complex bridge structures, model simplification has to be carried out. This paper focuses on how to establish an equivalent model for a complex bridge structure with large DOFs using reasonable simplfication procedures, for the purpose of theoretical analysis and numerical simulation. A simplified model of a cable-stayed bridge will be established for system identification under vertcial excitations. It will be shown that the proposed simplified model is statically and dynamically equivalent to the original prototype model of the bridge.