堆石体本身为弹塑性结构，应力和变形呈非线性关系，故确定计算方法采用增量有限元法；
Rockfill is elastoplastic itself and its stress-strain relationship is nonlinear. So the calculation method must be incremental FEM.
对于考虑介质与结构弹塑性性质的课题，解析解更难以求得。
The problem becomes more sophisticated when elastoplastic properties of rock mass and structures are considered.
运用渡槽薄壁结构弹塑性动力分析模型，开展了渡槽非线性地震响应分析计算。
Based on the elastic-plastic dynamic model of the thin-wall structure aqueduct, the non-linear earthquake response analysis is presented.
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