Zhang Tong, Wang Hongshan, Zheng Xuanhe, Gao Shan
School of Civil Engineering, Liaoning Technical University, Fuxin 123000, China.
Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education, Harbin Institute of Technology, Harbin 150000, China.
Materials (Basel). 2024 Jun 6;17(11):2782. doi: 10.3390/ma17112782.
The axial compressive behaviours of coal gangue concrete-filled steel tube (GCFST) columns after chloride salt corrosion were investigated numerically. Numerical modelling was conducted through the static analysis method by finite element (FE) analysis. The failure mechanism, residual strength, and axial load-displacement curves were validated against tests of the coal gangue aggregate concrete-filled steel tube (GCFST) columns at room and natural aggregate concrete-filled steel tube (NCFST) columns after salt corrosion circumstance. According to the analysis on the stress distribution of the steel tube, the stress value of the steel tube decreased as the corrosion rate increased at the same characteristic point. A parametric analysis was carried out to determine the effect of crucial variation on residual strength. It indicated that material strength, the steel ratio, and the corrosion rate made a profound impact on the residual strength from the FE. The residual strength of the columns exposed to chloride salt was in negative correlation with the corrosion rate. The impact on the residual strength of the column was little, obvious by the replacement rate of the coal gangue. A simplified design formula for predicting the ultimate strength of GCFST columns after chloride salt corrosion exposure was proposed.
对氯盐腐蚀后煤矸石钢管混凝土（GCFST）柱的轴向受压性能进行了数值研究。通过有限元（FE）分析的静力分析方法进行数值模拟。针对煤矸石骨料钢管混凝土（GCFST）柱在室内试验以及盐腐蚀环境后的天然骨料钢管混凝土（NCFST）柱试验，对其破坏机理、残余强度和轴向荷载 - 位移曲线进行了验证。根据对钢管应力分布的分析，在同一特征点处，钢管应力值随腐蚀率的增加而降低。进行了参数分析以确定关键变量对残余强度的影响。结果表明，材料强度、含钢率和腐蚀率对有限元分析得到的残余强度有深远影响。暴露于氯盐环境下柱的残余强度与腐蚀率呈负相关。煤矸石替代率对柱残余强度的影响较小。提出了一个用于预测氯盐腐蚀后GCFST柱极限强度的简化设计公式。
