The research of approach to monitor bridge health state has become a hot spot which social and technologic people have explored through the theory of, dynamics of structures and the lest technology.

利用结构动力学原理和现代检测技术相结合对桥梁的健康状态进行识别的方法研究已成为相关科技工作者关注的热点。

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System dynamics model shows the deed of system with structure and the focal point of system dynamics is to find structures.

系统动力学模型用结构展现系统行为，因此，系统动力学的重点是发现结构。

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Then the author combines the basic equation of impact dynamics with finite element method and establishes the analysis method of complex structures under impact load.

将冲击动力学的基本方程和有限元分析相结合，建立了复杂结构在冲击载荷作用下的分析方法。

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