The element siiffness matrix and the geometric stiffness matrix etc. are explicitly presented.
单元的刚度矩阵和几何刚度矩阵全部显式给出。
The geometric stiffness matrix is composed by the effect of axial force, bending moment and bimoment.
其中几何刚度矩阵由轴向力、双向弯曲和截面翘曲的影响组成。
In this paper, a improved geometric stiffness matrix of a column element considering axial force-lateral displacement effects is derived.
本文推导了柱单元受大轴力和单元变形过大两种情况下的单元几何刚度矩阵。
The three-node beam element tangent stiffness matrix including the geometric stiffness matrix is developed according to the nonlinear finite element theory.
进而依据非线性有限元理论推导了该三结点梁单元的几何刚度矩阵的单元切线刚度矩阵；
Method for computing the element restoring force, rather than the stiffness matrix, is the most important factor that determines the accuracy of a geometric nonlinear finite element problem.
几何非线性单元的精度主要决定于单元恢复力的计算方法，刚度矩阵对单元精度的影响很小。
Numerical calculation process to obtain the tangent stiffness matrix of structure is deduced and geometric stability of different types of structures are analyzed.
推导了铰接杆系结构切线刚度矩阵较为简便的计算生成过程，便于在编程中实现。
Having introduced the eccentric space thin-walled girder and the space combined cable elements, the author has derived element elastic stiffness matrix, geometric stiffness and masse matrix.
引入偏心空间薄壁梁单元及空间组合索单元，导出弹性刚度阵、几何刚度阵、质量阵。拉索张力随垂度变化的非线性由等效几何刚度计入。
Having introduced the eccentric space thin-walled girder and the space combined cable elements, the author has derived element elastic stiffness matrix, geometric stiffness and masse matrix.
引入偏心空间薄壁梁单元及空间组合索单元，导出弹性刚度阵、几何刚度阵、质量阵。拉索张力随垂度变化的非线性由等效几何刚度计入。
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