secant stiffness matrix

This paper mainly deals with the secant method used on stiffness matrix.

主要说明割线法在刚度矩阵上的应用.

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Secant stiffness matrix and tangent stiffness matrix of reinforced concrete arbitrary cross-section members with eccentric compression load are derived, on the base of plane assumption and the cross-section equilibrium equations.

以平截面假设为基础，利用截面内力平衡关系，推导出钢筋混凝土双向偏压构件截面割线刚度、切线刚度矩阵计算的简便公式。

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At the same time, from the basic theory of mechanics of materials, particularly expatiate the material secant stiffness of the principal strain direction and the principal stress direction and the element transformation matrix; they provide the theory basis of the procedure presented in this paper.

同时由材料力学出发详细推导了主应变或者主应力方向上的材料割线刚度、单元坐标转换矩阵，为本文程序的编制提供了理论基础。

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