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介绍了在双向弯曲及轴向作用下任意截面钢筋混凝土柱强度分析的精确方法.该方法既考虑了材料非线性特征,也考虑了构件变形对柱承载力的影响.混凝土和钢筋的实际应力-应变关系用三次多项式分段模拟.得到的单元刚度矩阵是小位移材料非线性刚度、几何刚度矩阵以及高阶相互作用矩阵的简单叠加.建立的分析模式既可用于柱的材料强度破坏分析,也可用于柱的稳定破坏分析.分析模型运用于任意形状截面钢筋混凝土中心受压、偏心受压和双向偏压构件.推导的标准有限元公式很容易与其他有限元模型兼容,理论分析结果与实验结果吻合较好.
The accurate method for strength analysis of reinforced concrete columns with arbitrary cross section subjected to bidirectional bending and axial action is introduced.The method not only considers the nonlinear characteristics of materials but also considers the influence of component deformation on the column bearing capacity.The actual stress- The strain relationship is simulated by cubic polynomial. The obtained element stiffness matrix is a simple superposition of nonlinear stiffness, geometric stiffness matrix and high order interaction matrix of small displacement materials. The established analytical model can be used to analyze the failure of material strength of columns, Which can be applied to the stability analysis of columns.The analytical model is applied to the compression, eccentric compression and bi-directional biasing members in the reinforced concrete with arbitrarily shaped cross section.The derived standard finite element equations are easy to be compatible with other finite element models, and the theoretical analysis results and experiments The result is in good agreement.