本文对分析钢筋混凝土梁的抗剪承载能力的变角度桁架模型和模拟拱模型进行修正,给出两个无粘结预应力混凝土梁的抗剪承载能力计算模型,编制了一个有限元非线性分析程序,测试了两根试验梁;并将理论分析和测试结果与规范(JTJ 023—85)所用方法计算的结果进行比较;得出若干结论,和提出抗剪承载力的计算方法。 In this paper, the modified angle truss model and simulated arch model for the analysis of shear capacity of reinforced concrete beams are modified. The shear capacity calculation model for two unbonded prestressed concrete beams is given and a finite element nonlinear analysis is developed. Two test beams were tested in the program; the theoretical analysis and test results were compared with the results of the method used in the specification (JTJ 023-85); several conclusions were drawn, and a calculation method for the shear capacity was proposed.