| 马辉*,方蕾,黄坤涛,强佳琪.硫酸盐侵蚀后型钢混凝土短柱轴压性能及退化规律研究[J].实验力学,2024,39(4):495~506 |
| 硫酸盐侵蚀后型钢混凝土短柱轴压性能及退化规律研究 |
| Study on the axial compression performance and degradation law of steel reinforced concrete short columns after sulfate corrosion |
| 投稿时间：2023-11-29 修订日期：2024-02-03 |
| DOI：10.7520/1001-4888-23-251 |
| 中文关键词: 硫酸盐侵蚀 型钢混凝土柱 轴压性能 退化规律 承载力计算 |
| 英文关键词:sulfate attack steel reinforced concrete column axial compression performance degradation law bearing capacity calculation |
| 基金项目:国家自然科学基金项目(51408485); 西安市科技计划项目（24GXFW0063）; 轨道交通基础设施性能监测与保障国家重点实验室开放课题(HJGZ2022105) |
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| 中文摘要: |
| 为研究硫酸盐侵蚀环境下型钢混凝土短柱的轴压性能退化规律，开展了腐蚀后混凝土试块的抗压性能试验和型钢混凝土短柱试件的轴压性能试验；通过试验观察了短柱试件的轴压破坏特征，并获取了短柱试件的承载力及延性等性能指标。结果表明，短柱试件在轴压荷载作用下整体破坏形态基本一致，型钢、纵筋和箍筋相继发生屈服，混凝土剥落严重，最终试件发生破坏；随着侵蚀龄期或硫酸钠溶液浓度的增大，短柱试件的承载力和延性呈现先增后减的规律；在侵蚀120d时增幅达到最大，短柱的承载力增大14.90%，延性增大21.44%；当溶液浓度达到10%时，短柱的承载力和延性降幅达到最大，分别降低8.04%和10.72%，故在高浓度硫酸钠溶液中长期浸泡会对试件轴压性能产生较大的不利影响。基于本文试验研究和现有规范公式，建立了考虑不同侵蚀龄期及硫酸钠溶液浓度影响下，型钢混凝土短柱的轴压承载力修正计算模型，并验证了该计算模型对硫酸钠溶液环境下型钢混凝土短柱的适用性。 |
| 英文摘要: |
| To study the degradation law on the axial compressive properties of steel reinforced concrete short columns under the sulfate attack environment, the compressive performance test of concrete specimens and axial compressive performance test of short column specimens of steel reinforced concrete were carried out after corrosion.The axial compression damage characteristics of short column specimens were observed through the tests, and the performance indexes of bearing capacity and ductility of short column specimens were obtained. The results show that the overall failure mode of short column specimens is basically the same as under the axial compressive loads. The profile steel, longitudinal bars, and stirrups yield one after another, which leads to the severe peeling of concrete and the failure to specimens finally.The bearing capacity and ductility of short column specimens increase firstly and then decrease with the increase of the erosion age or the concentration of sodium sulfate solution. At the erosion age of 120 days, the bearing capacity and ductility of short columns increase 14.90% and 21.44% respectively. When the solution concentration reaches to 10%, the maximum reduction in bearing capacity and ductility of the short column is achieved, which are reduced by 8.04% and 10.72%, respectively. Therefore, the long-term immersion in the high concentration sodium sulfate solution has a great adverse effect on the axial compression performance of specimens. Based on the experimental study in this paper and the existing standard formulas, a modified calculation model on the axial compressive capacity of steel reinforced concrete short columns under the influence of different erosion ages and the sodium sulfate solution concentration is established, and the applicability of the model to this type of member in this environment is verified. |
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