酸雨腐蚀后圆钢管再生混凝土柱偏压试验研究

Experimental study of recycled concrete filled circular steel tube column subjected to eccentric compression after acid rain corrosion

为模拟酸雨环境腐蚀条件下试件极限承载力的变化，进行了9根圆形截面钢管混凝土柱的偏心受压试验，试验综合考虑了偏心距、骨料类型和腐蚀程度三个主要参数，研究了在通电条件情况下加速试件在酸雨环境下的腐蚀速度的机理；分析了偏心距、骨料类型和腐蚀程度对试件的极限承载力影响；并将有限元软件模拟计算与实际试验进行了比对。试验结果表明：使用通电法加速试件在酸雨环境下的腐蚀速率，在一定程度上，法拉第电化学腐蚀定律适用该通电加速腐蚀试验；随着偏心距和腐蚀程度的增加。试件的极限承载力均呈现出降低的趋势，而骨料类型（普通、再生）却对其不存在显著的影响；利用有限元软件ABAQus对所有圆形截面钢管混凝土偏心受压柱的极限承载力进行模拟，试验结果与之吻合度较高。

In order to simulate the change of ultimate bearing capacity of recycled concrete filled circular steel tube column in acid rain corrosion environment, an eccentric compression experiment was carried out for 9 specimens. In experiment, three main parameters, including eccentricity, aggregate type and corrosion level were overall considered. The focus of experiment was on the mechanism of accelerating corrosion rate of specimen in acid rain environment and under the condition of power supply, and on the effect of eccentricity, aggregate type and corrosion level on specimen＇s ultimate bearing capacity, and on comparison between the simulation results from finite element analysis with experimental data. Experimental results indicate that the acceleration of specimen＇s corrosion rate in acid rain environment and under the condition of power supply, to some extent, can be explained by Faraday electrochemical corrosion law; the specimen＇ s ultimate bearing capacity decreases with the increase of eccentricity and corrosion degree, and aggregate type （ordinary or recycled）has little influence on it. The ultimate bearing capacity of recycled concrete filled circular steel tube column was numerically simulated by ABAQUS finite element analysis software, simulated results are in good agreement with experimental data.