（西安外事学院建筑工程系， 西安 710077）

［摘要］为了解氯离子侵蚀下约束混凝土的抗压力学性能，在盐雾腐蚀实验室对12组约束混凝土试件进行氯离子腐蚀试验，进而对其进行轴心抗压试验，得到不同箍筋配箍率和不同锈胀裂缝宽度下试件的受压应力-应变曲线，分析箍筋配箍率和锈胀裂缝宽度对腐蚀试件强度、刚度、延性等的影响。结果表明：随着箍筋配箍率的增大，试件的承载力和延性不断提高；随着箍筋锈蚀裂缝宽度的增大，试件的峰值荷载减小，强度降低，延性变差。并考虑箍筋锈蚀的约束作用对核心区混凝土本构关系的影响，建立了锈蚀约束混凝土受压本构关系理论模型，将其与试验数据拟合回归得到的应力-应变全曲线进行对比，两者吻合良好，故该理论模型可应用于锈蚀钢筋混凝土结构、构件的非线性分析中。

［关键词］氯离子； 约束混凝土； 锈蚀箍筋； 轴心抗压试验； 本构关系

中图分类号：TU375文献标识码：A文章编号：1002-848X(2019)12-0103-06

Experimental study on mechanical properties of confined concrete under chloride salt erosion

Cao Chen

（Department of Architecture Engineering, Xi′an International University, Xi′an 710077, China）

Abstract:In order to understand the compressive mechanical properties of confined concrete under chloride ion erosion, salt corrosion laboratory was used to conduct chloride ion corrosion test on 12 groups of confined concrete specimens, and then subjected to axial compression test to obtain the compressive stress-strain curves of specimens with different stirrup ratios and different corrosive cracks widths. The influence of stirrup ratio and width of corrosive crack on the strength, stiffness and ductility of the corrosion specimen were analyzed. The results show that the bearing capacity and ductility of the specimens increase with the increase of the stirrup ratio. With the increase of the width of the rust cracking, the peak load of the specimens decreases, the strength decreases and the ductility deteriorates. Considering the influence of the restraint of stirrup corrosion on the constitutive relationship of concrete in core zone, a theoretical model of the constitutive relation of corroded confined concrete was set up, and compared with the stress-strain curve obtained by regression fitting of experimental data. The two agree well with each other. Therefore, the theoretical model can be applied to the non-linear analysis of corroded reinforced concrete structures and components.

Keywords:chloride; confined concrete; stirrup corrosion; axial compression experiment; constitutive relation

*陕西省教育厅专项科研计划项目（16JK2175）。

作者简介：曹琛，博士，讲师，Email:376760966@qq.com。