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为了分析钢筋黏结退化区段的空间分布对钢筋混凝土(RC)结构承载机制和破坏形态的影响,对10根模拟完全黏结失效的RC梁进行实验研究.从荷载挠度关系曲线、箍筋屈服举动、裂缝进展情况以及构件破坏形态出发,利用桁架和拱理论分析了纵向受拉钢筋不同区段的黏结退化及不同锚固形式箍筋的黏结退化对RC梁抗剪性能的影响.研究结果表明:纵向受拉钢筋的端部区域黏结失效比跨中区域黏结失效更为危险,破坏模式呈脆性,且承载能力有较大幅度的下降;端部黏结失效导致的上述影响在剪跨比较大梁中尤为明显;箍筋形式对梁的最终承载力影响不大,但相对于开口型箍筋,闭合型箍筋对斜裂缝开口进展有更好的限制作用.
In order to analyze the influence of the spatial distribution of bond degeneration zone on the bearing mechanism and failure mode of reinforced concrete (RC) structure, ten RC beams with simulated failure are investigated experimentally. From the curves of load deflection, yield behavior of stirrup, The progress of cracks and the failure modes of components, the truss and arch theory are used to analyze the influence of the bond degradation of different sections of longitudinal tensile reinforcement and the bond degradation of stirrups with different anchorage forms on the shear resistance of RC beams. The results show that the longitudinal It is more dangerous to pull the reinforcement in the end region than that in the mid-span region. The failure mode is brittle and the carrying capacity is greatly decreased. The above-mentioned effect caused by the end bonding failure is more obvious in the beam with larger shear-span ratio. The stirrups have little effect on the final bearing capacity of the beam, but the closed stirrups have a better effect on the progress of the oblique crack opening than the open stirrups.