根据有限元理论及基本假定,考虑了材料的非线性及结构的几何非线性,应用Fortran语言编制无粘结预应力高性能粉煤灰混凝土桥梁极限承载力的非线性有限元程序,并用程序对9根无粘结预应力混凝土试验梁进行了计算.计算结果和试验结果符合良好,说明该分析程序是可靠的,并且能准确可靠的预测无粘结预应力高性能粉煤灰混凝土桥梁从开始加载直到破坏的全过程结构响应;试验结果也表明不同粉煤灰掺量对高性能混凝土桥梁的极限承载力影响不大和高性能粉煤灰混凝土桥梁中混凝土、钢筋和预应力钢筋参数按《桥规》取值计算能够取得比较满意的结果. According to the finite element theory and the basic assumptions, considering the nonlinearity of the material and the geometrical nonlinearity of the structure, the nonlinear finite element program of the ultimate bearing capacity of unbonded prestressed high performance fly ash concrete bridge is compiled by using Fortran language. 9 unbonded prestressed concrete test beams were calculated.The calculated results are in good agreement with the experimental results, indicating that the analytical procedure is reliable and accurate and reliable prediction of unbonded prestressed high-performance fly ash concrete bridges from the beginning The experimental results also show that the different fly ash content has little effect on the ultimate bearing capacity of high performance concrete bridges. The parameters of concrete, steel bar and prestressed concrete in high performance fly ash concrete bridges are in accordance with “Bridge Regulation ”value to obtain more satisfactory results.