自平衡单元及其刚度矩阵的推导方法

Self Balanced Elements and the Derivation of Their Stiffness Matrices

提出了自平衡单元的概念，介绍了几种典型的自平衡单元，并结合平面三角形单元。

The concept of self balanced elements is presented. Some typical self balanced elements are introduced with emphasis on the derivation of their stiffness matrices, taking triangular elements as an example.