An experimental study is performed on five post-tensioned concrete beams to explore the effects of different fracture positions on secondary transfer length and residual prestress of fractured strand. A numerical model is developed and used to predict the secondary transfer length and residual prestress of fractured strand in post-tensioned concrete beams. The model change interaction, which can deactivate and reactivate the elements for simulating the removal and reproduction of parts of the model, is used to reproduce the secondary anchorage of fractured strand. The numerical model is verified by experimental results. Results shows that the fractured strand can be re-anchored in concrete through the secondary anchorage, and the secondary transfer length of fractured strand with the diameter of 15.2 mm is 1133 mm. The residual prestress of fractured strand increases gradually in the secondary transfer length, and tends to be a constant beyond it. When the fractured strand is fully anchored in concrete, a minor prestress loss will appear, and the average prestress loss is 2.28% in the present study.

通过对5根后张混凝土梁进行试验研究，探讨不同断裂位置对断裂钢绞线二次传递长度和残余预应力的影响。建立了一种数值模型，用于预测后张混凝土梁中断裂钢绞线的二次传递长度和残余预应力。模型更改交互作用，可以去激活和重新激活用于模拟模型部分移除和再现的元素，用于再现断裂钢绞线的二次锚固。通过实验结果验证了数值模型。结果表明，断裂钢绞线可通过二次锚固重新锚固在混凝土中，直径15.2 mm的断裂钢绞线二次转移长度为1133 mm。断裂钢绞线的残余预应力随着二次传递长度逐渐增大，超过该长度后趋于恒定。当断裂钢绞线完全锚固在混凝土中时，会出现较小的预应力损失，在本研究中平均预应力损失为2.28%。