A bilevel programming model and heuristic solution algorithm is proposed to model the continuous equilibrium network design problem with elastic demand.

采用双层规划模型描述弹性需求条件下的连续平衡网络设计问题，设计了近似解的启发式算法。

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According to the three dimensional elastic equilibrium equations and the conditions of interfacial shear slip, a model of interfacial shear slip of laminated composite plates is developed.

根据三维弹性平衡方程和层间剪切滑移条件，导出了一个复合材料层板层间剪切滑移模型。

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The first-order derivative equal to zero of total potential energy with respect to the relative shear deformation of shear band leads to the equilibrium condition of elastic rock.

将系统的总势能对相对剪切变形求一阶导数（等于零），得到了弹性岩石的平衡条件。

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