锈蚀钢筋混凝土梁正截面承载力计算探讨

Exploration on computing of normal section bearing capacity of corroded RC beams

利用极限平衡公式,通过对大量试验数据的分析,计算了梁弯曲破坏时的钢筋应力,并与相应锈蚀钢筋名义屈服强度进行了比较。结果表明,在锈蚀率不是特别大、梁端锚固良好的情况下,锈蚀钢筋面积及力学性能的降低,是导致梁正截面承载力退化的主要原因,粘结性能降低对其影响不显著;构件破坏时,受拉钢筋均可达其名义屈服强度;利用与现行规范形式相同的承载力计算公式,便可对锈蚀梁的正截面承载力进行评估。

Using the ultimate equilibrium formula, basing on the analysis of abundant test data, stress of the corroded steel is computed at flexural failure of the beam, compared with its specified yield point. The result shows that reduced corroded steel area and mechanical prosperity, not the bonding prosperity, are the prime reasons for the falling of normal section bearing capacity; tension reinforcement can reach the specified yield point at good beam anchor and not too large corrosion ratio; then the bearing capacity computing formula in the form of applicable code can be used for the assessment of normal section bearing capacity of corroded RC beams.