往复荷载作用下的钢管混凝土柱耗能和塑性变形性能

以果园港二期工程桩基为原型,对钢管混凝土柱进行低周反复加载试验。基于ABAQUS有限元软件,以不同的核心混凝土配筋率、混凝土强度为参数进行分析。结果表明,钢管混凝土柱的钢管在柱底位置易发生屈曲变形甚至屈鼓;钢管混凝土结构中钢管的厚度增加,使钢管混凝土结构的塑性变形能力增强,具有承载能力高、延性良好等优点;配筋率的增加增强了钢管混凝土柱模型的塑性变形和耗能性能;而混凝土强度的增加对钢管混凝土柱塑性变形和耗能性能影响比较有限。

Energy dissipation and plastic deformation behavior of concrete-filled steel tubular column under reciprocating load

Taking the pile foundation of second-phase project of Guoyuan Port as the prototype,we carry out the low-cycle repeated loading test of concrete-filled steel tubular column,and analyze the reinforcement rate and concrete strength of different core concrete based on ABAQUS finite element software.The results show that the steel tube of concrete-filled steel tubular column is prone to buckling and even bulges at the bottom of the column.As the thickness of the steel tube increases,the plastic deformation capacity of the concrete-filled steel tube structure is enhanced,which has the advantages of high bearing capacity and good ductility.The plastic deformation and energy dissipation of CFST column model are enhanced by the increase of reinforcement ratio.However,the increase of concrete strength has limited effect on the plastic deformation and energy dissipation of concrete-filled steel tubular column.