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首页> 外文期刊>Journal of Materials Engineering and Performance >The Corrosion Effects on the Structural Integrity of Reinforcing Steel
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The Corrosion Effects on the Structural Integrity of Reinforcing Steel

机译：腐蚀对钢筋结构完整性的影响

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An experimental study conducted on 12 mm diameter, artificially corroded BSt500{sub}s steel rebars, showed that the mass loss, the fatigue limit, and the life expectancy were reduced according to the level of corrosion. Rebar corrosion has a great impact on the mass loss, mechanical properties, low cycle fatigue (LCF) and there is strong indication that embrittlement takes place. The extended salt-spray exposure enhanced the damage and promoted extended creation of pits and perforations suggesting progressive embrittlement and reduction of the available energy, justified by the SEM micrograph results. The low cycle strain-controlled fatigue testing under ±1, ±2.5, and ±4% constant amplitude strain indicated that the corroded steel bars exhibit gradual reduction in available energy, number of cycles to failure, and load bearing ability. For the ±1% strain level the fatigue limit was reduced considerably as the level of corrosion increased due to mass loss and reduction of the exterior martensitic layer. In addition, a drastic drop in the energy density of the specimens was observed with creation of stress concentration points. At ±2.5% and ±4% strain levels, the fatigue limit was reduced dramatically mainly due to accumulated damage from plastic deformation and minimally due to corrosion. Anti-seismic design that ignores the influence of corrosion and cumulative damage due to plastic deformation, and the mechanical behavior of reinforcing steel during severe ground motion, could lead to unpredictable performance.
机译：对直径为12 mm的人工腐蚀的BSt500 {sub} s钢筋进行的实验研究表明，随着腐蚀程度的降低，质量损失，疲劳极限和预期寿命会降低。钢筋腐蚀对质量损失，机械性能，低周疲劳（LCF）有很大影响，并且有很强的迹象表明发生脆化。延长的盐雾暴露加剧了损伤，并促进了坑和穿孔的延长形成，表明逐渐变脆并减少了可用能量，这是由SEM显微照片结果证明的。在±1，±2.5和±4％恒定振幅应变下进行的低循环应变控制疲劳测试表明，腐蚀的钢筋显示出可利用能量，失效循环次数和承载能力的逐渐降低。对于±1％的应变水平，由于质量损失和外部马氏体层的减少，随着腐蚀水平的提高，疲劳极限大大降低。此外，观察到样品的能量密度急剧下降，并产生了应力集中点。在±2.5％和±4％的应变水平下，疲劳极限显着降低，这主要归因于塑性变形的累积破坏，而腐蚀所造成的破坏则最小。抗震设计忽略了塑性变形引起的腐蚀和累积损坏的影响，以及在剧烈地面运动期间钢筋的机械性能，可能导致性能无法预测。

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