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本文提出了一种用于外张预应力钢筋混凝土结构非线性分析的单元模型，此模型可模拟外张预应力钢筋在转向点处的滑移和摩擦作用。将这一单元模型与混凝土和钢筋单元模型相组合，建立了外张预应力钢筋混凝土结构非线性分析程序，非线性方面包括了材料和几何非线性。该有限元模型可用于外张预应力钢筋混凝土结构从张拉施工至使用阶段的全过程分析，分析内容包括弹塑性变形、混凝土开裂和破坏等。最后给出的实例表明模型计算分析结果与试验结果[１］吻合良好。
This paper presents a unit model for nonlinear analysis of prestressed external prestressed concrete structures. This model simulates the slippage and friction of external prestressing tendons at turning points. By combining this element model with the concrete and steel element model, a non-linear analysis program of external prestressed reinforced concrete structure is established. The non-linearity includes material and geometrical nonlinearity. The finite element model can be used to analyze the whole process of prestressed reinforced concrete structure from tensioning to using. The analysis includes elastoplastic deformation, cracking and destruction of concrete. The last example shows that the model calculation and analysis results agree well with the experimental results [1].