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。结合某高速公路淮河桥工程,进行了跨度为35m的折线先张法预应力混凝土箱梁受力性能试验,对钢绞线的预应力损失,混凝土的应力,箱梁的抗裂性能、挠度以及承载力进行了分析。结果表明折线先张预应力混凝土箱梁的受力性能良好,为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. Combined with a Huaihe bridge project of a highway, a test of mechanical behavior of prestressed concrete box girder with pre-tensioned broken line with a span of 35m was carried out. The effects of prestressing loss, concrete stress, cracking resistance, load bearing capacity Analyzed. The results show that the prestressed prestressed concrete box girder with broken line has good stress performance and provides the basis for engineering application.