轴向反复荷载作用下圆钢管混凝土柱的受力性能研究

RESEARCH ON THE MECHANICAL PROPERTIES OF CONCRETE-FILLED STEEL TUBULAR COLUMN UNDER AXIAL CYCLIC REVERSE LOADING

采用ABAQUS有限元软件建立了圆钢管混凝土柱有限元模型,研究了钢管及核心混凝土的应力分布情况和破坏发展进程,分析了柱在轴向拉压反复荷载作用下的受力性能,探讨了不同材料强度、径厚比等因素对构件受力性能的影响规律。研究表明:圆钢管混凝土柱具有较好的弹塑性变形能力和耗能能力,轴向抗震性能较好;材料强度对轴向承载力影响较大,径厚比对轴向承载力和刚度均有较大影响。

The numerical model of concrete-filled steel tubular column was established by the finite element analysis software ABAQUS. A reasonable constitutive model was chosen to study the stress distribution and failure process of both steel tube and core concrete,whose mechanical properties under axial tension and compression cyclic reverse loading were also analyzed. The influence of different material strength and diameter-thick ratio on the mechanical properties was also investigated. The results revealed that the concrete filled steel tubular column had good elastic-plastic deformation capacity,energy dissipation capacity and axial seismic behavior. Moreover,the material strength had a significant effect on the axial bearing capacity,while the diameter-thick ratio showed a great effect on the axial bearing capacity and stiffness.