本文分析了预应力混凝土结构端部锚固区产生纵向裂缝的原因。指出预留孔道削弱了锚固区抗劈裂的能力,成为降低开裂荷载的主要因素。本文提出了验算端部锚固区抗裂性的计算公式和端部横向配筋的计算方法,论述了防止这类裂缝的主要技术措施。文内还给出了算例和主要实验结果。 This paper analyzes the causes of longitudinal cracks in the anchorage zone of prestressed concrete structures. It is pointed out that the reserved channel weakens the ability of the anchorage zone to resist cracking and becomes the main factor to reduce the cracking load. In this paper, the calculation formula of the crack resistance of the end anchorage zone and the calculation method of the end transverse reinforcement are proposed, and the main technical measures to prevent such cracks are discussed. The article also gives examples and main experimental results.