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钢筋与混凝土间的粘结力是二者共同工作的基本前提;粘结强度和粘结滑移关系是分析混凝土构件承载力和预测结构寿命的基础。本文通过室内模拟试验,研究了混合侵蚀与冻融环境下,钢筋与混凝土的粘结强度退化规律。探讨了环境作用、钢筋直径、混凝土质量对钢筋混凝土粘结性能的影响,得到了粘结滑移曲线。在试验研究的基础上,给出了混合侵蚀与冻融环境下粘结强度的计算模型。分析结构表明,钢筋直径越大,混凝土强度越低、水灰比越大,钢筋的极限粘结强度越低;应重视混凝土质量对粘结强度的影响。
The bond between steel bar and concrete is the basic prerequisite for their joint work. The bond strength and bond-slip relationship are the basis for analyzing the bearing capacity of concrete members and predicting the life of the structure. In this paper, through indoor simulation test, the degradation of bond strength between reinforced concrete and concrete under mixed erosion and freeze-thaw environment was studied. The effect of environment, the diameter of steel bar and the quality of concrete on the bond performance of reinforced concrete was discussed, and the bond slip curve was obtained. Based on the experimental study, the calculation model of bond strength under mixed erosion and freeze-thaw environment is given. Analysis of the structure shows that the larger the diameter of the steel bar, the lower the concrete strength, the greater the water-cement ratio, the lower the ultimate bond strength of the steel; the quality of the concrete should pay attention to the bond strength.