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精确地建立梁柱单元模型是钢筋混凝土杆系工程结构非线性分析的关键。依据虚位移原理,耦合钢筋混凝土材料非线性和几何非线性,推导出任意形状截面钢筋混凝土梁柱单元模型。单元积分采用沿横截面二维高斯积分和沿梁柱单元长度一维高斯积分的双重高斯积分算法,使钢筋混凝土非线性梁柱单元积分更加简单和精确。应用所提出的梁柱单元模型和单元双重高斯积分方法编制了相应的结构有限元分析程序(STA-D),对13个异形(L形、T形、十字形)截面柱、3榀异形柱框架结构进行非弹性分析,理论分析结果与试验结果吻合较好。
Accurately establishing the beam-column element model is the key to the nonlinear analysis of reinforced concrete structure. According to the principle of virtual displacement and the nonlinear and geometric nonlinearity of the coupled RC materials, the element model of RC beam-column with arbitrary shape is deduced. Element Integral Double Gaussian integration of two-dimensional Gaussian integral along the cross-section and one-dimensional Gaussian integral along the length of the beam column element makes the integration of nonlinear beam-column elements of reinforced concrete more simple and accurate. The corresponding structural finite element analysis program (STA-D) was developed by applying the proposed beam-beam element model and element double Gaussian integration method. Thirteen deformed (L, T, The inelastic analysis of the frame structure shows that the theoretical analysis is in good agreement with the experimental results.