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为了研究钢管与混凝土之间相互作用对钢管与混凝土间无黏结非一体型钢管混凝土柱轴压承载性能的影响,以未考虑与钢管相互作用的素混凝土和考虑与钢管相互作用的混凝土为对象,钢管径厚比为25~67,建立了7个非一体型钢管混凝土柱有限元分析模型,进行三维有限元分析,并与以往试验结果比对。结果表明:对于非一体型钢管混凝土柱模型,考虑钢管与混凝土相互作用时的初始刚度、最大轴力值与试验结果基本一致;不考虑时的初始刚度、最大轴力值小于试验结果;随着钢管厚度增大,钢管径厚比减小,其相互作用增大明显。当钢管径厚比小于25时,若考虑相互作用的破坏形式,建议混凝土按三轴膨胀破坏设计。
In order to study the influence of the interaction between steel tube and concrete on the axial compressive bearing capacity of unbonded steel tube-to-concrete (CFST) columns between concrete filled steel tube and concrete, taking the concrete with no interaction with steel tube and the concrete with steel tube interaction as object, The diameter-thickness ratio of steel pipe is from 25 to 67. Seven finite element analysis models of non-integrated concrete-filled steel tubular columns are established, and the three-dimensional finite element analysis is carried out and compared with the previous test results. The results show that the maximum axial force is basically the same as the experimental one when considering the initial stiffness of the concrete filled steel tube and the concrete. When the initial stiffness is not considered, the maximum axial force is smaller than the test result. Steel pipe thickness increases, steel pipe diameter to thickness ratio decreases, the interaction increases significantly. When the thickness ratio of steel pipe is less than 25, considering the form of interaction damage, it is recommended that concrete be damaged by triaxial expansion.