Stiffness matrix of the model and element stiffness was developed.

推导了模型的单元刚度矩阵和各杆件的刚度.

The introduction includes the principle of instituting contact interface element, the element stiffness matrix of parallel infinite element and the method of coupling the different element.

阐述了接触元建立的方法；推导了平行无限元的单元刚度矩阵方法以及无限元单元刚度矩阵组装成总体刚度矩阵的原理。

The use of element stiffness matrix will produce exact solutions for members with linearly varying radius.

对于截面半径按线性变化的梁，运用该扭转刚度矩阵将得到精确解。

This paper presents element stiffness matrix of parabolic wedge-shaped beam of rectangular section in plane frame structure.

提出了平面框架结构中矩形截面抛物线楔形梁的单元刚度矩阵。