配置500 MPa级钢筋混凝土梁的抗弯延性分析

为分析配置500 MPa级纵筋混凝土梁的抗弯延性性能,对6个混凝土梁试件进行弯曲破坏试验,分析不同混凝土强度和纵筋配筋率对延性性能的影响.结果表明:配置500 MPa级纵筋混凝土梁与400 MPa级纵筋混凝土梁的弯曲破坏形式基本一致;随着混凝土强度等级的增大,梁的抗弯承载力和延性也相应增大;纵筋配筋率的提高会使梁的延性降低;相对于400 MPa级纵筋混凝土梁,在相同的纵筋配筋率及混凝土强度条件下,配置500 MPa级纵筋混凝土梁的抗弯承载力得到明显改善,但其延性会下降.在工程中,可以通过降低纵筋配筋率提高混凝土梁的延性,达到节省钢筋的目的.

Analysis of Flexural Ductility of Reinforced Concrete Beams With 500 MPa Steel

n order to analyze the flexural ductility performance of concrete beams with 500 MPa longitudinal reinforcement, the bending failure tests of 6 concrete beam specimens were carried out to analyze the influence of different concrete strengths and the ratio of longitudinal reinforcement on the ductility performance. The results show that the bending failure of 500 MPa reinforced concrete beam is basically the same as that of 400 MPa reinforced concrete beam. With the increase of concrete strength grade, the flexural capacity and ductility of the beam increase. With the increase of the ratio of longitudinal reinforcement, the ductility of the beam decreases. Comparing with the 400 MPa longitudinal reinforced concrete beam, the flexural capacity of the 500 MPa longitudinal reinforced concrete beam with the same longitudinal reinforcement ratio and concrete strength is significantly improved, but its ductility decreases. In the engineering, the ductility of the concrete beam can be improved by reducing the ratio of longitudinal reinforcement, so as to save steel bar.