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为了探究剪跨比对高强钢筋活性粉末混凝土(RPC)梁抗剪性能的影响,对中等剪跨比条件下,3根HRB500级钢筋活性粉末混凝土无腹筋简支梁进行抗剪性能试验研究,分析不同剪跨比对高强钢筋RPC梁受剪破坏形态、斜裂缝宽度、开裂荷载与极限荷载的影响。通过研究得出:高强钢筋RPC梁比普通混凝土梁传递剪力的能力和延性显著增强;临界斜裂缝倾角大小随剪跨比的增大而减小;开裂荷载与剪跨比大小无比例关系,极限荷载随剪跨比的增大而减小;基于桁架-拱模型无腹筋梁的抗剪承载力计算式,比较适用于高强钢筋RPC无腹筋梁抗剪承载力的计算。
In order to explore the influence of shear span ratio on shearing performance of high strength reinforced reactive concrete (RPC) beam, the shear resistance of 3 HRB500 reinforced concrete with non-web reinforcement was tested and analyzed under middle shear span ratio Effect of different shear-span ratios on shear failure morphology, crack width, crack load and ultimate load of RPC beams with high strength steel bars. The results show that the capability and ductility of high strength reinforced RPC beams to transfer shear force are significantly enhanced compared with that of ordinary concrete beams; the inclination angle of critical diagonal cracks decreases with the increase of shear span ratio; the crack load is not proportional to the size of shear span ratio, The ultimate load decreases with the increase of shear span ratio. Based on the truss-arch model, the calculation formula of shear strength of reinforced concrete beams without web reinforcement is more suitable for the calculation of shear strength of RPC reinforced reinforced concrete beams.