折线先张预应力梁是采用先张法张拉折线形钢绞线的一种新型预应力混凝土梁,已开始在桥梁工程中应用。通过预应力钢绞线在弯起器处的弯折摩擦损失和弯折抗拉强度试验,分析了影响钢绞线弯折摩擦损失和弯折抗拉强度的主要因素,提出了相应的计算公式,为折线先张法预应力混凝土梁的工程应用提供了依据。 Polyline pre-tensioned prestressed beam is pretensioned tensioned wire with a new type of prestressed concrete beams, has begun to apply in the bridge project. Through the bending friction loss and bending tensile strength test of prestressed steel strand at the bends, the main factors that affect the friction loss and the bending tensile strength of the strand are analyzed. The corresponding formulas , Provided the basis for engineering application of prestressed concrete beam with pre-tensioned fold line.