It is necessary to elaborate on the definition of a fatigue coefficient such as that for ductility.

有必要对疲劳系数，如延性系数的定义作详细讨论。

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Comparing two types of damage model, it is proposed to adopt the model based on the ductility coefficient.

通过比较两种不同的损伤模型，建议采用一个基于延性系数的损伤模型。

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Based on the piers mode shape function, this paper studied the methodology of structure ductility coefficient by modal test and the procedure of the structures inelastic seismic force.

以桥墩的基本振型函数为基础，推导出基于试验动力参数的在役桥梁结构延性系数的计算公式，并给出了结构非弹性地震力的求解方法。

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