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为探讨预应力超高强混凝土梁的抗弯性能,进行了4根后张法有粘结预应力超高强混凝土简支梁在竖向静力荷载作用下的受力性能试验,分析了试件受力过程、破坏形态、短期最大裂缝宽度以及跨中挠度等相关试验数据.结果表明:预应力超高强混凝土梁受弯破坏形态和挠曲模式与预应力混凝土梁基本相同;试验梁跨中控制截面基本符合平截面假定,极限承载力按照规范正截面抗弯理论计算可行.通过分析试验数据,在现行规范的基础上修正了裂缝宽度及挠度计算公式.研究结果可为超高强混凝土梁的设计以及相关规范的修订提供理论依据.
In order to investigate the flexural behavior of prestressed super high-strength concrete beams, the mechanical behavior of four post-tensioned prestressed super high strength concrete beams under vertical static load was studied. The results show that the bending failure modes and flexural modes of prestressed super high-strength concrete beams are basically the same as those of prestressed concrete beams. The cross-section of test beam Which is basically consistent with the assumption of the plane section and the ultimate bearing capacity is calculated according to the normal sectional bending theory.According to the experimental data, the formula of the crack width and deflection is modified based on the existing specifications.The research results can be used to design the ultra-high strength concrete beam, Relevant norms to provide a theoretical basis for the revision.