火灾后内配H型钢的矩形钢管混凝土柱剩余承载力有限元分析

该文采用ABAQUS有限元软件建立了火灾后内配H型钢的矩形钢管混凝土柱模型,计算了常温下与火灾后该构件的轴向荷载-位移关系曲线,对火灾后的受力性能进行了分析;此外与相同含钢率的钢管混凝土柱构件火灾后剩余承载力进行了对比,发现内配型钢钢管混凝土柱剩余承载力较钢管混凝土柱得以增强,且构件延性优于钢管混凝土;同时对比了强、弱轴两种加载方式下该类构件火灾后剩余承载力,最后对影响火灾后该类构件剩余承载力的主要因素进行了参数分析,发现升温时间、截面周长和长细比对其影响较为显著。

Finite element analysis of residual strength of concrete-filled rectangular steel tubular column with encased H shaped profiled steel after exposure to fire

This paper presents a finite element (FE) model of concrete-filled rectangular steel tubular column with encased H shaped profiled steel to study the post-fire residual strength using the ABAQUS software. The axial load-displacement curves of columns were calculated after exposure to fire and the normal temperature; In addition, the post-fire residual strength of concrete-filled steel tubular columns with the same steel ratio was studied, and it was found that the residual strength of CFST column with encased H shaped profiled steel increased. At the same time, the results under loading at major axis and secondary axis were compared. The parametric studies of members were also calculated. The heating up time, cross-section dimension and slenderness ratio of column have significant effects on the post-fire residual bearing capacity. ]