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设计了45片钢筋混凝土(RC)构件,基于RC构件通电加速锈蚀,对该批构件进行腐蚀试验研究,测试了锈胀裂缝宽度及其位置和发生时间。以钢筋锈蚀率、保护层锈胀开裂、锈胀裂缝宽度、相对保护层厚度和混凝土强度为分析参数,结合测试数据,利用加速腐蚀和自然腐蚀的对应关系,通过数理统计回归分析建立了锈胀开裂宽度的预测模型。分析了各参数对锈胀开裂扩展的影响。该模型对RC结构耐久性设计提供一定的参考。使用本文建立的模型以及规范模型对文献试验数据和一座服役近40年的实桥构件的锈蚀率和锈胀裂缝宽度进行了预测,计算结果表明本文模型有较强的适用性,能够用于实桥锈胀损伤分析。
45 pieces of reinforced concrete (RC) members were designed. Based on the RC members energized to accelerate the corrosion, the corrosion test of the members was carried out. The width of the corrosion cracks and its location and time were tested. Based on the analysis of corrosion rate, corrosion cracking, corrosion crack width, relative protective layer thickness and concrete strength, combined with the test data, the relationship between accelerated corrosion and natural corrosion was established by mathematical statistic regression analysis to establish the corrosion expansion Prediction model of cracking width. The influence of each parameter on the expansion of rust expansion was analyzed. The model provides some reference to the durability design of RC structure. Using the model and the normative model established in this paper, the experimental data of the literature and the corrosion rate and corrosion crack width of a real bridge component that has been in service for nearly 40 years are predicted. The calculation results show that the model has strong applicability and can be used in real Bridge rust damage and damage analysis.