可基于截面刚度矩阵以及现有的位移模式推导出弹塑性阶段的单元刚度矩阵。
According to section stiffness matrix and available displacement mode, element stiffness matrix of elastoplastic stage was derived in this paper.
弹塑性阶段是累计振铃数增长的主要阶段，累计振铃数达到AE累计振铃总数的35.35%；
Elastoplastic phase(III) is the main phase, in which AE accumulative counts increase more, about 35.35% of its total counts.
但这些研究多建立在弹性阶段分析的基础之上，对于弹塑性阶段的选波采用了与弹性阶段相同的特征周期。
But these researches all established on the stage of elasticity analysis, the same characteristic period of response spectrum was used for the stage of elastoplastic analysis.
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