Chapter 2: basic theories about finite element method are introduced, basic formulas about elastic-plastic finite element method and elastic-plastic matrix are put forward.

第二章介绍了有限单元法的基本原理，详细推导了弹塑性有限元法的基本公式和弹塑性矩阵。

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This paper presents a simplified plastic zone method with consideration of the influences of the plastic zone length on the stiffness matrix for elastic-plastic analysis of steel frames.

对于杆件单元，本文采用了一种变刚度的杆单元模型，建立了考虑塑性铰分布长度影响的构件单元刚度矩阵。

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An explicit expression of stiffness matrix for a 3-dimensional beam made of elastic-plastic material is derived in the paper.

本文推导了材料为理想弹塑性的空间梁单元弹塑性刚度矩阵的显式形式。

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