腐蚀对钢筋力学性能影响的研究

Research of the Influence of Corrosion for Mechanical Property of Reinforcing Bars

为准确掌握钢筋腐蚀后性能的变化规律及其影响,通过对新乡某电厂—冷却塔筒壁外表面19根已腐蚀钢筋的试验研究分析,探讨了钢筋的腐蚀机理及腐蚀对钢筋力学性能的影响,认为该批受腐蚀钢筋性能的降低是试样平均截面积的减小,腐蚀坑存在造成的应力集中和材质改变3种因素共同作用的结果,同时分析了钢筋各项力学性能指标与钢筋腐蚀程度的变化规律,建立了腐蚀钢筋最薄弱截面损失率和重量损失率的关系式,并用以衡量钢筋的腐蚀程度,为结构的残余承载力、寿命及耐久性评估提供依据.

<Abstrcat> The corrosion of reinforcing bar in reinforced concrete structure can weaken its strength and ductility, thus causing structural bearing capacity and endurance to decrease. To accurately grasp the influence and the change law of the property, with the experiment on a group of corrosion reinforcing bars, the testing results are analyzed. It concludes that the influence of the property of corrosion reinforcing bars is formed by the combining action of three kind factors,such as average section reduction,stress concentration caused by corrosion hollows and material quality change. By summarizing the change law of every mechanical property index and the corrosion level of reinforcing bars, it establishes the relation ship between the weakest area loss rate and weight loss rate to evaluate the corrosion level of reinforcing bar, and to make appraisal for the remnant bearing capacity, life and durability of the structure.