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对曝露在盐碱或海洋条件下的钢筋混凝土结构,其安全性和适用性的研究逐渐引起了工程人员的兴趣。其中一个研究重点是钢筋的腐蚀。目前相关的现场经验和数据都很少,这不利于结构安全和适用性评估中强度和性能退化模型的开发。利用理论和概率建模,提出一个替代方法。有证据显示:包裹钢筋的混凝土的内部损伤会影响氯化物传播速率。这可能是由外荷载或混凝土收缩产生的局部应力而导致。通常,实际效果是初始腐蚀的时间缩短,导致更大的局部腐蚀、最终强度和结构刚度的更早退化。在示范梁上应用提出的方法,并且与试验结构相对比,包括对最终残余弯矩和梁刚度的预测。提议方法的分析结果与试验具有很好的一致性。
Research on the safety and suitability of reinforced concrete structures exposed to saline or marine conditions has drawn the interest of engineers. One of the focuses of research is the corrosion of steel bars. There is currently little relevant field experience and data, which is detrimental to the development of strength and performance degradation models for structural safety and suitability assessment. Using theoretical and probabilistic modeling, an alternative approach is proposed. Evidence shows that internal damage to concrete wrapped with steel bars can affect chloride transmission. This may be caused by local stresses caused by external loads or concrete shrinkage. In general, the practical effect is a reduction of the initial corrosion time leading to greater localized corrosion, an earlier degradation of final strength and structural stiffness. The proposed method is applied to the demonstration beam and is compared to the experimental structure, including the prediction of the ultimate residual bending moment and beam stiffness. The analytical results of the proposed method are in good agreement with the experiment.