利用杆件截面的弯矩—曲率关系，可以直接由弹性杆件的转角—位移方程建立单元的非线性刚度矩阵。
By using the moment-curvature relationships of the member section, the inelastic element stiffness matrix is derived directly from the slope-deflection equation of clastic member.
风荷载作用下的非线性静力失稳理论，推导了适合计算的非线性刚度矩阵，并开发了大跨度桥梁的非线性静力。
Wind Loads nonlinear static instability theory, derived for calculating the nonlinear stiffness matrix, and the development of long-span Bridges in the nonlinear static.
本文详细地分析了囊体结构的非线性变形过程及刚度矩阵出现奇异的原因；
This paper analyzes the nonlinear deformational process of the envelop structure and the cause of stiffness matrix singularity in details.
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