笔者用有限元法进行了分析，给出了单元的线性刚度矩阵和增量刚度矩阵。
Finite element method is used in the analysis. The linear incremental and stiff matrices are derived.
在预应力加固设计方面，钢吊车梁与混凝土吊车梁不同，由于其刚度较小、挠度较大，当吊车荷载作用上去后，会引起水平拉杆作用效应增量。
The steel crane girder's rigidity is smaller and its deflection is larger, when the crane moves, there will be force increment in the prestressed horizontal tie.
本文采用三维弹塑性增量变塑性刚度有限元法计算地下洞室围岩稳定。
In this paper, the elastoplastic incremental finite element method with variable plastic stiffness is used to analyse the surrounding rock stability of underground openings.
本文以变刚度的增量原理为基础，论述了复合材料组合网架的弹塑性设计方法。
This paper, basing on the principle of the changing rigidity, discusses the clastic-plastic designing method of the complex material grids.
因而，得到的单元切线刚度矩阵是对称的，此外在增量求解过程中用节点变量的全量进行更新。
As a result, the element tangent stiffness matrix is symmetric and is updated by using the total values of the nodal variables in an incremental solution procedure.
采用增量变塑性刚度迭代法，求解非线性动力方程。
The incremental variable plastic stiffness iteration method is employed to solve dynamic equations.
本文首先利用刚性单柱屈曲荷载增量与支撑刚度的关系，得到了单柱横系杆支撑、斜拉杆支撑的门槛刚度要求。
Based on the relationship between the buckling load of a rigid column and the bracing stiffness, the critical stiffness requirement of the bracing for a single column was obtained.
本文首先利用刚性单柱屈曲荷载增量与支撑刚度的关系，得到了单柱横系杆支撑、斜拉杆支撑的门槛刚度要求。
Based on the relationship between the buckling load of a rigid column and the bracing stiffness, the critical stiffness requirement of the bracing for a single column was obtained.
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