桥梁结构的动力特性就是结构振动的基本特性，是对桥梁结构进行地震反应分析的基础。
Dynamic characteristics of bridge structure is the foundation of seismic response analysis of bridge structures.
结构的动力特性是评价古塔抗震性能和损伤状态的重要指标。
The origin and present situation of the ancient iron pagodas are described in this paper.
结构的动力特性是评价古塔抗震性能和损伤状态的重要指标。
The origin and present situation of the ancient iron pagodas are described in this paper.
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