论文部分内容阅读
在退化RC结构的时变性能评估、剩余寿命预测以及维修加固决策分析中,其抗力模型的建立至关重要。钢筋锈蚀导致钢筋的屈服强度降低、改变钢筋力学行为和影响钢筋与混凝土之间的粘结行为。钢筋腐蚀损失量影响钢筋的失效模式,即从延性破坏到脆性破坏变化。该文发展了退化RC桥梁的概率抗力时变模型,可以定量考虑腐蚀对钢筋力学行为、倒塌机理和粘结性能的影响。建立退化结构的抗力概率模型可以抓住退化结构的退化机理、点蚀分布、结构尺寸参数、粘结行为、腐蚀扩展、钢筋失效模式和计算模型的随机性和变异性。RC梁的加速腐蚀试验和旧桥的破坏性试验验证了该文模型的正确性和可靠性。
In the degradation of RC structure of the time-varying performance assessment, the remaining life prediction and repair reinforcement decision analysis, the establishment of its resistance model is essential. Corrosion of rebar leads to the decrease of the yield strength of rebar, changes the mechanical behavior of rebar and affects the bond behavior between rebar and concrete. The corrosion loss of rebar affects the failure mode of rebar, that is, the change from ductile damage to brittle failure. In this paper, the probability-resistance time-varying model of degraded RC bridges is developed, which can quantitatively consider the influence of corrosion on the mechanical behavior, collapse mechanism and bonding behavior of rebars. Establishing the resistance probability model of degraded structure can grasp the randomness and variability of degradation mechanism, pitting corrosion distribution, structural size parameter, bond behavior, corrosion expansion, failure mode of steel reinforcement and calculation model. The accelerated corrosion test of RC beam and the destructive test of old bridge verify the correctness and reliability of the model.