内配型钢方钢管混凝土偏压构件受火全过程数值模拟

NUMERICAL SIMULATION ANALYSIS ON CONCRETE-FILLED SQUARE STEEL TUBULAR COLUMNS WITH INTERNAL PROFILED STEEL UNDER ECCENTRIC COMPRESSION EXPOSURE TO FULL-RANGE FIRE

  • 摘要: 内配型钢钢管混凝土构件由于其较高的承载力、较好的延性及耗能能力在工程实践中具有良好的发展前景,该文运用ABAQUS有限元软件,在合理选取钢材、混凝土本构热力模型的基础上,采用顺序热-力耦合的方法建立了内配型钢的方钢管混凝土偏心受压柱火灾全过程的数值模型,计算了其火灾全过程作用下的轴向荷载-位移曲线,分析了截面应变、应力的变化情况及火灾全过程作用下各组件的荷载分配情况,最后对影响极限承载力的主要因素进行了参数分析,发现火灾荷载比、升温时间比、长细比、荷载偏心率及钢管含钢率等因素对构件承载力的影响较为显著。

     

    Abstract: Concrete-filled steel tubular members with internal profiled steel have prosperous development in practical engineering duo to the high bearing capacity and good ductility and energy dissipation. This paper presents a finite element (FE) model of concrete-filled steel tubular column (CFST) with internal profiled steel to study the full-range fire performance under eccentric compression using the ABAQUS software based on the reasonable material models of steel and concrete. The axial load versus displacement curves were calculated and stress and strain distribution were analyzed when exposed to full-range fire. Parametric studies of CFST members with internal profiled steel were also performed. The results show that the fire load ratio of column, ascending time ratio, slenderness ratio of column and the steel ratio of tube have significant effects on the bearing capacity.

     

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