氯盐侵蚀下预损型钢混凝土柱的轴压力学性能试验研究

Experimental research on the axial compression behaviors of pre-damaged steel reinforced concrete columns under the chloride salt erosion

摘要

为研究氯盐侵蚀下预损型钢混凝土柱的轴心受压性能，通过试验研究观察了试件和材料的耐久性及腐蚀破坏特征，分析了预损程度、侵蚀持续时间以及氯盐浓度等因素对型钢混凝土柱轴压承载力及延性等性能指标的影响趋势。研究表明，氯盐侵蚀下的型钢混凝土柱表现出相似的轴压破坏特征，试件中的型钢、纵筋以及箍筋依次进入屈服阶段，最终导致试件失效。随着侵蚀龄期、氯盐侵蚀浓度或预损程度的增加，试件的承载能力和延性呈现先上升后下降的趋势。当氯盐侵蚀300 d时，试件的承载力和延性与氯盐侵蚀180 d时相比分别降低4.29%和7.75%。当侵蚀浓度为5.0%时，试件的承载力和延性与侵蚀浓度为3.5%时相比分别降低3.64%和8.56%。此外，与一级预损试件相比，三级预损的试件承载力和延性分别降低了4.81%和7.41%。基于试验研究和规范公式，提出了预损型钢混凝土柱在氯盐侵蚀条件下的轴压承载力计算模型，可为实际工程实践提供依据。

Abstract

To study the axial compression performance of pre-damaged steel reinforced concrete columns under chloride salt erosion, the experimental research was conducted to observe the durability and corrosion damage characteristics of specimens and materials. The investigation encompassed an analysis of the factors, including the degree of damage prior to reinforcement, the duration of the erosion process, and the chloride concentration on the axial bearing capacity and ductility of steel-reinforced concrete columns. The findings indicate that steel reinforced concrete columns under the axial loads corroded by chloride exhibit similar axial compressive failure characteristics. The profile steel, longitudinal rebars, and stirrups in the specimens sequentially enter the yield stage, which ultimately leads to the failure of specimens. With the increase in erosion age, chloride salt erosion concentration, and pre-damage, the axial bearing capacity and ductility of the specimens show a trend of first increasing and then decreasing. When the chloride salt erosion lasted for 300 days, the bearing capacity and ductility of the specimens decreased by 4.29% and 7.75% respectively, compared to 180 days of chloride salt erosion. When the erosion concentration was 5.0%, the bearing capacity and ductility of the specimens decreased by 3.64% and 8.56% respectively, compared to 3.5% erosion concentration. In addition, compared with the first level pre-damaged specimens, the axial bearing capacity and ductility of third level pre-damaged specimens decreased by 4.81% and 7.41%, respectively. Based on experimental research and standard formulas, a calculation model for the axial compressive bearing capacity of pre-damaged steel reinforced concrete columns under chloride salt erosion conditions was proposed, which can provide a basis for actual engineering practice.

关键词

预损型钢混凝土柱 / 氯盐侵蚀环境 / 轴压行为 / 破坏特征 / 计算方法

Key words

pre-damaged steel reinforced concrete columns / chloride salt erosion environment / axial compression behaviors / failure characteristics / calculation method

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基金资助

国家自然科学基金项目(51408485)

陕西省自然科学基础研究计划项目(2025JC-YBMS-407)

西安市科技计划项目(24GXFW0063)