内置CFRP工字形型材的方钢管混凝土偏压短柱有限元分析

FINITE ELEMENT ANALYSIS ON CONCRETE-FILLED SQUARE STEEL TUBE SHORT COLUMNS WITH INNER I-SHAPED CFRP PROFILES UNDER ECCENTRIC COMPRESSION

采用非线性有限元软件ABAQUS对内置CFRP工字形型材的方钢管混凝土偏压短柱进行模拟,得到了典型构件的荷载-跨中挠度曲线,分析了构件在偏压荷载作用下的力学性能,探究偏心率、含钢率、钢材强度和混凝土强度对构件受力性能的影响规律。分析结果表明:偏心率对构件的受力性能影响最为明显;随着偏心率的增大,构件的初始刚度和承载力均明显降低;随着含钢率、钢材强度和混凝土强度的增大,构件荷载-跨中挠度曲线的弹性阶段变化不明显,构件的承载力增大。

Concrete-filled square steel tube short columns with inner I-shaped CFRP profile（ CFRP-CFST） under eccentric compression were analyzed by using nonlinear finite element software ABAQUS. The load and mid-span deflection curve of the typical members were calculated and analyzed to study the mechanical properties of CFRP-CFST column under the eccentric compression. In addition,the effects of the eccentric ratio,steel ratio,steel strength and concrete strength on the mechanical properties of CFRP-CFST columns were also studied. The results showed that eccentric ratio had the most significant effect on the mechanical properties of the members. The initial stiffness and bearing capacity decreased obviously with the increase of the eccentric ratio. The bearing capacity of the composite column increased with the increase of the steel ratio,steel strength and concrete strength,but the load and mid-span deflection curve at elastic stage did not change obviously.