Axial compression performance of concrete columns reinforced with 2304 solid stainless bars and spirals, carbon steel bars and spirals, and 316 L stainless steel clad bars is examined after the columns are exposed to severe corrosion. Two groups of columns were investigated: a control group, and a group submerged in a 5.0% by weight chloride solution subjected to accelerated corrosion. A relatively high impressed current density of 8.5 μA/mm2 was used and after 60 days of accelerated corrosion the columns were tested to failure under axial compression. In terms of mass loss per unit of corrosion energy, columns reinforced with stainless steel spirals and either solid stainless or stainless clad vertical bars were 197% more corrosion resistant than carbon steel. Bars made with 2304 solid stainless steel and 316 L stainless clad materials developed localized pitting corrosion that led to degradation of the concrete cover and a larger drop in axial compression than carbon steel reinforced columns. However, the carbon steel reinforced columns reached lower failure displacements and a corroded carbon steel reinforced column was the only column to experience sudden failure prior to reaching its theoretical maximum axial compression capacity. Axial compression capacity of the columns in both the control and corroded conditions was modeled using concrete confinement models that produced good agreement with the experimental results.

中文翻译：

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耐腐蚀金属增强筋混凝土柱的轴压承载力

在柱子受到严重腐蚀之后，检查了用2304实心不锈钢棒和螺旋，碳素钢棒和螺旋以及316 L不锈钢复合棒增强的混凝土柱的轴向压缩性能。研究了两组色谱柱：对照组和浸没在5.0％（重量）氯化物溶液中的组，它们受到加速腐蚀。使用了相对较高的8.5μA/ mm2的外加电流密度，并且在加速腐蚀60天后，对色谱柱进行了轴向压缩下的破坏测试。就每单位腐蚀能的质量损失而言，用不锈钢螺旋和实心不锈钢或不锈钢包覆的垂直钢筋加强的柱子比碳钢的耐蚀性高197％。由2304实心不锈钢和316 L不锈钢包层材料制成的钢筋会产生局部点蚀，与碳钢增强柱相比，锈蚀会导致混凝土表层退化和轴向压缩降幅更大。但是，碳钢增强柱的破坏位移较小，而腐蚀的碳钢增强柱是唯一在达到其理论最大轴向压缩容量之前经历突然破坏的柱。使用混凝土约束模型对在控制和腐蚀条件下圆柱的轴向压缩能力进行建模，这些模型与实验结果吻合良好。碳钢加固柱达到较低的破坏位移，而腐蚀的碳钢加固柱是唯一在达到其理论最大轴向压缩能力之前经历突然破坏的柱。使用混凝土约束模型对在控制和腐蚀条件下圆柱的轴向压缩能力进行建模，这些模型与实验结果吻合良好。碳钢加固柱达到较低的破坏位移，而腐蚀的碳钢加固柱是唯一在达到其理论最大轴向压缩能力之前经历突然破坏的柱。使用混凝土约束模型对在控制和腐蚀条件下圆柱的轴向压缩能力进行建模，这些模型与实验结果吻合良好。