方钢管钢骨混凝土中钢骨锈蚀量计算

针对混凝土中的钢骨锈蚀后,钢骨的周围产生锈胀力,随着锈蚀程度的增加,钢骨锈胀力将导致混凝土保护层开裂,影响钢骨混凝土结构耐久性的问题,应用弹性力学的方法建立了混凝土锈胀开裂时方钢管锈蚀量的计算模型,得到了钢骨锈蚀量的计算公式,并对影响钢骨锈蚀量的因素进行了分析.分析结果表明,钢骨锈蚀量随着混凝土保护层厚度、钢管内径的增加和混凝土强度等级的提高而加大,随着钢管外径和铁锈膨胀率的增加而减小.

Corrosion Damage Calculation for Steel Tube in Rectangular Steel-Reinforced Concrete

Expansive force will occur around the reinforced steel in concrete due to corrosion,and it increases with corrosion damage and,as a result,it will crack the concrete cover so as to shorten the durability of steel-reinforced concrete structures.Based on the elastic mechanics,a corrosion damage calculation model is therefore developed for the steel tube in rectangular steel-reinforced concrete pipes when concrete is cracking due to corrosive expansion,with a relevant formula given.In addition,the influencing factors on the corrosion damage are analyzed,and the results indicate that the corrosion damage increases with the thickness of concrete cover,inner diameter of steel tube and concrete strength grade,but it decreases with increasing outer diameter of steel tube and expansion rate due to corrosion.