锈蚀钢筋混凝土梁抗弯承载力计算

针对目前锈蚀钢筋混凝土构件的研究仅考虑钢筋锈蚀程度的影响,而忽略了在相同锈蚀程度下构件其他参数对承载力退化的影响,导致现有计算模型参数相差较大的问题,对现有锈蚀钢筋混凝土梁抗弯承载力计算方法进行了对比分析。基于无粘结钢筋混凝土梁的研究成果,分析钢筋锈蚀程度、截面配筋率对锈蚀损伤构件的承载力退化产生的影响,综合考虑锈蚀构件截面配筋指标以反映不同构件参数对其产生的影响及无粘结梁钢筋强度利用系数的计算公式,建立了一般锈蚀钢筋混凝土梁受拉钢筋强度利用系数的计算公式。经试验验证,数据吻合很好,其结果有益于完善和发展锈蚀钢筋混凝土梁抗弯承载力的计算方法。

Flexural Bearing Capacity Calculation of Corroded Reinforced Concrete Beams

The present researches on corroded reinforced concrete members mainly focused on the corroded degree of steel bars,and other influences were systematically considered.These resulted in the differences among the existing parameters of calculation model.Therefore,the calculation methods of flexural bearing capacity strength of corroded reinforced concrete beams were comparatively analyzed.Based on the study results on the non-bond reinforced concrete beams,factors that influence the stress of steel bar in heavily corroded reinforced concrete members were investigated in detail.The results show that reinforcement index can reflect the influences of both concrete strength and reinforcement ratio on the steel stress.The degrading mechanism of bearing capacity for ordinary corroded reinforced concrete beams was analyzed,and a calculation formula of flexural capacity was proposed,which considers both corrosion degree and reinforcement index.The method was used to analyze large numbers of tested members,and there was excellent agreement between calculation results and experiment results.The results were useful to perfect the calculation method of the flexural bearing capacity of corroded reinforced concrete beams.