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对5根配置600MPa钢筋有粘结部分预应力混凝土梁进行静力加载试验,对试验梁的受弯承载力、混凝土应变、裂缝分布及延性等进行了分析,研究了混凝土强度及非预应力钢筋配筋率对试验梁抗弯性能的影响。结果表明:试验梁达到受弯极限状态时,尽管钢绞线未屈服,但600MPa钢筋可屈服,且梁的破坏仍具有一定的延性;试验梁跨中截面混凝土应变基本符合平截面假定,极限承载力可按照桥涵设计规范中抗弯理论公式计算;提出600MPa钢筋在预应力混凝土梁中抗拉强度设计值取500MPa,为600MPa钢筋在预应力混凝土结构中的应用提供参考依据。
Five prestressed concrete beams with 600MPa reinforcing bars are tested with static loading, and the flexural capacity, strain distribution and crack distribution of the beams are analyzed. The effects of concrete strength and non-prestressed reinforcement Influence of reinforcement ratio on flexural behavior of test beam. The results show that when the test beam reaches the bending limit state, the 600MPa steel can yield and the failure of the beam still has some ductility even though the steel strand is not yielding. The concrete strain in the mid-section of the test beam basically conforms to the assumption of the flat section and the ultimate load The force can be calculated according to the bending resistance theory formula in the design code of bridge and culvert. The design value of tensile strength of 600MPa steel bar in prestressed concrete beam is 500MPa, which provides a reference for the application of 600MPa steel bar in prestressed concrete structure.