方钢管铁尾矿再生混凝土柱抗震性能有限元分析

为解决铁尾矿再生混凝土在钢管混凝土柱中的应用问题，揭示不同参数条件下钢管铁尾矿再生混凝土柱滞回性能的变化规律，通过ABAQUS有限元软件建立了方钢管铁尾矿再生混凝土柱的数值模型。基于所建模型进行了参数化分析，研究了轴压比、宽厚比、长细比、材料强度等参数对试件抗震性能的影响。结果表明：随着轴压比由0增至0.6，承载力逐渐下降17.7%，延性逐渐下降，承载力退化速度加快；当钢材厚度不变，宽厚比由66.7减至28.6时，承载力大幅度提高61.61%，承载力退化速度放缓，耗能能力增加；随着长细比由13.16增至26.33，试件承载力下降17.5%，刚度明显下降，承载力退化速度变缓；钢材强度及混凝土强度的提升可有效提高承载力，而对试件刚度影响不大。研究证明了钢管铁尾矿再生混凝土柱具有良好的抗震性能，并可为钢管铁尾矿再生混凝土柱的应用提供理论参考。

Finite element analysis of seismic performance of iron tailings recycled concrete-filled steel tube columns with square section

To solve the application of iron tailings recycled concrete in concrete-filled steel tube columns and reveal the effect of different parameters on the hysteretic performance of iron tailings recycled concrete-filled steel tube columns, the numerical model of iron tailings recycled concrete-filled steel tube columns with square section was established by ABAQUS finite element software. The parametric analysis was carried out based on this finite element model, and the effects of axial compression ratio, width-thickness ratio, and material strength on the seismic performance were fully explored. The results show that with the axial compression ratio increases from 0 to 06, the bearing capacity gradually decreases by 177%. The ductility gradually decreases and the bearing capacity degrades faster. When the width-thickness ratio is reduced from 667 to 286 with the steel thickness remaining, the bearing capacity is greatly increased by 6161%. The bearing capacity degradation slows down, and the energy-consuming capacity is increased. With the increase of the slenderness ratio from 1316 to 2633, the bearing capacity of the specimens decreases by 175%. The stiffness decreases significantly, and the bearing capacity degradation slows down. The increase in steel and concrete strength improves the peak bearing capacity, while the elastic stiffness remains essentially unchanged. This study proves that iron tailings recycled concrete-filled steel tube columns have good seismic performance, which also provides theoretical reference for the application of iron tailings recycled concrete-filled steel tube columns.