Prestressed concrete girders are prone to the formation of horizontal end cracks during prestress transfer. These cracks propagate and progress extensively in deeper hollow-type pretensioned girders with larger prestressing forces. This study examines the strand-debonding method to eliminate horizontal cracks at the ends of hollow–type pretensioned girders by directly reducing the vertical tensile stresses resulting from the prestress release acting on the strands. Finite element analysis is adopted to model the girder and identify the cracking zone in the cross-section. Furthermore, the load-bearing capacity of the girder is investigated through a four-point bending test using construction stage analysis in a numerical simulation. The numerical results are validated through fabrication of an actual girder with geometrical and mechanical specifications identical to those in the numerical model. The experimental findings match the numerical results; the horizontal end cracks diminish with the application of the proposed method. Furthermore, the study confirms the normal behavior of the girder against vertical loading; the girder can resist the load, similar to a girder with an ordinary cross-section.

预应力混凝土梁在预应力传递过程中容易产生水平端部裂缝。这些裂纹在具有较大预应力的较深空心型预应力梁中广泛传播和发展。本研究通过直接降低预应力释放作用于钢绞线而产生的垂直拉应力，研究钢绞线脱粘法，以消除空心型预应力梁端部的水平裂纹。采用有限元分析对梁进行建模并识别横截面中的开裂区域。此外，通过数值模拟中的施工阶段分析，通过四点弯曲试验研究了梁的承载能力。通过制造几何和机械规格与数值模型相同的实际梁来验证数值结果。实验结果与数值结果相符；随着所提出的方法的应用，水平端部裂纹减少。此外，该研究证实了大梁抵抗垂直载荷的正常行为；大梁可以抵抗载荷，类似于普通截面的大梁。