钢筋混凝土双向偏压构件截面非线性分析的割线刚度法

本文用三次多项式分段模拟混凝土和钢筋的非线性本构关系的方法，以平截面假定为基础，得截面内力平均关系，对钢筋混凝土弯压构件任意形状截面进行了非线性分析，推导出截面割线刚度矩阵的表达式以及截面内任意点应变，应力与截面变形，截面力之间的关系，刚度矩阵中系数可用格林积分公式和高斯数值积分法计算。

The Secant Stiffness Method of Nonlinear Analysis of Reinforced Concrete Biaxial Eccentric Compression Member

This paper applies the method of the cubic polynomial functions to simulating the nonlinear constitutive relationship of concrete and reinforcement. On the basis of the plane section assumption, the arbitrary cross-section of reinforced concrete member with biaxial eccentric loading is analyzed. The cross-section secant stiffness matrices have been derived from the cross-section equilibrium equations, which are calculated by Green function and Gauss numerical integration. The relation of strain, stress and deformation, forces of the cross-section have also been derived.