预应力混凝土的应用至今未有合理简便的模型准确预测其受剪承载力。基于此，设计了一组预应力混凝土简支梁，旨在研究其受剪性能。通过观察试验梁的开裂状况、结合试验梁在分级荷载作用下的破坏形态，提出了一种新的受剪承载力预测模型。模型采用了拉－压杆模型的基本思路，传力路径明确，同时考虑了混凝土在复杂应力的软化效应。模型形式简洁，计算结果和试验值有较好的吻合度，结果表明可以作为工程计算的依据。%Although the application of prestressed concrete has a history of nearly 80 years, its shear mechanism has not been fully clarified. In this paper, a group of prestressed concrete simply supported beams were designed to study its shear mechanism. By observing the crack development and shear failure mode under the stepped load of every grade of the tested beam, a new shear capacity model was proposed. The model is based on strut-and-tie model, the force transfer path is clear, and the concrete softening effect under complex stress conditions is consid⁃ered. It was discovered that the model is compact, the shear capacity predicted by the model agrees well with the experiment results and can be used in the engineering design.
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