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设计了一套使钢筋混凝土梁剪切破坏稳定可控的刚性试验系统,利用该试验系统,完成了19根剪跨比为3的钢筋混凝土简支梁的剪切破坏试验,得到了荷载-挠度曲线。根据试验结果,分析了混凝土强度等级、箍筋的强度和倾角、纵筋配筋率和纵向分布钢筋等因素对试验梁破坏形态、剪切延性系数和受剪承载力的影响,并将受剪承载力试验值与我国混凝土结构设计规范和美国ACI规范计算值进行了对比。结果表明:对于剪跨比等于3的梁,适当配置腹筋,可以改善其延性性能;在高强混凝土梁中应用高强箍筋,可使两种材料的强度充分发挥,不仅增加了梁的剪切延性,而且提高了梁的受剪承载力;高强箍筋高强混凝土梁的受剪承载力仍可采用我国现行混凝土结构设计规范公式进行计算,但是对于高强混凝土无腹筋梁、纵筋配筋率低的梁和配有高强箍筋的普通强度混凝土梁安全度偏低。
A set of rigid test system was designed to make the shear failure of RC beams stable and controllable. By using this test system, the shear failure test of 19 reinforced concrete simply supported beams with shear to span ratio of 3 was completed, and the load-deflection curve. According to the test results, the influence of concrete strength grade, strength and inclination of stirrups, reinforcement ratio of longitudinal reinforcement and longitudinally distributed reinforcement on the failure mode, shear ductility coefficient and shear capacity of test beam are analyzed. The test values of the bearing capacity are compared with those of the concrete structure design code and the ACI code of the United States. The results show that for the beam with shear span ratio equal to 3, the ductility can be improved by properly arranging the webs. The application of high-strength stirrups in high-strength concrete beams can give full play to the strength of the two materials, not only increasing the shear ductility , But also improve the shear capacity of the beam. The shear capacity of high strength concrete beams with high strength stirrup can still be calculated by the formula of China’s current concrete structure design formula, but for the non-reinforced concrete beams with high web strength, Beams and ordinary strength concrete beams with high strength stirrups have low safety.