李士彬, 张 鑫, 贾留东, 王 欣. 箍筋锈蚀钢筋混凝土梁的抗剪承载力分析[J]. 工程力学, 2011, 28(增刊I): 60-063,.
引用本文: 李士彬, 张 鑫, 贾留东, 王 欣. 箍筋锈蚀钢筋混凝土梁的抗剪承载力分析[J]. 工程力学, 2011, 28(增刊I): 60-063,.
LI Shi-bin, ZHANG Xin, . ANALYSIS FOR SHEAR CAPACITY OF REINFORCED CONCRETE BEAMS WITH CORROSION STIRRUPS[J]. Engineering Mechanics, 2011, 28(增刊I): 60-063,.
Citation: LI Shi-bin, ZHANG Xin, . ANALYSIS FOR SHEAR CAPACITY OF REINFORCED CONCRETE BEAMS WITH CORROSION STIRRUPS[J]. Engineering Mechanics, 2011, 28(增刊I): 60-063,.

箍筋锈蚀钢筋混凝土梁的抗剪承载力分析

ANALYSIS FOR SHEAR CAPACITY OF REINFORCED CONCRETE BEAMS WITH CORROSION STIRRUPS

  • 摘要: 为研究箍筋锈蚀钢筋混凝土梁抗剪性能退化规律,在考虑质量损失影响的基础上,对48根混凝土中自然锈蚀光圆钢筋试件进行轴向拉伸试验。结果表明:钢筋试件大多断面整齐,基本无颈缩现象,表现为脆性破坏;随着质量损失的增大,钢筋的屈服平台缩短甚至消失,极限变形显著减小。经回归分析,建立了自然锈蚀光圆钢筋的强度退化模型。考虑钢筋锈蚀对箍筋截面面积和力学性能及混凝土截面的影响,基于《混凝土结构设计规范》(GB50010-2002)以剪压破坏的受力特征为基础建立的混凝土梁抗剪承载力计算公式,提出了箍筋锈蚀钢筋混凝土梁的抗剪承载力估算公式。并且,对所提出的箍筋锈蚀钢筋混凝土梁的抗剪承载力的理论预测进行了试验验证。计算结果与试验结果吻合较好,且偏于安全。

     

    Abstract: In order to study the shear capacity degeneration of reinforced concrete(RC) beams with corrosion stirrups, considering the mass loss of the stirrup reinforcement, axial tensile tests were conducted on 48 naturally carbonation-induced corrosion plain steel bars embedded in roof concrete beams. The testing results indicate that the fracture section of corrosion steel bars is even without necking basically, and possesses a distinct brittle fracture character; also the yield point elongation of specimen shortens even disappears, and the limit deformation of specimens diminishes obviously with the increase of mass loss. By the regression analysis, a strength degeneration model of naturally corrosion plain steel bars is built. Considering the influence of steel bar corrosion on their cross-section and mechanical properties, as well as the reduction of the effective section area of the concrete, a shearing capacity assessment formula of RC beams with corrosion stirrups is proposed based on the shear capacity formula given by the actual Chinese code for the design of concrete structures(GB50010-2002). Finally, the proposed shear capacities of RC beams with corrosion stirrups are compared with the corresponding test results. The calculated results are shown to be in reasonable agreements with test ones.

     

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