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为了研究塑料制品代替钢管作为方中空夹层钢管混凝土中的内管对其轴压性能的影响,设计了内管为PVC管、PPR管、圆钢管的方中空夹层钢管混凝土试件共5根,对所有试件进行了轴压试验;并分析了其整体、核心混凝土、内管的破坏形态、荷载-纵向应变关系曲线及组合弹性模量,试件的轴压全过程运用有限元软件ABAQUS模拟。结果表明:PVC管受到压力时呈脆裂破坏,而PPR管和圆钢管有较好的抵抗塑性变形的能力;按极限承载力和组合弹性模量由大到小的排列是:钢内管试件,PPR内管试件,PVC内管试件;有限元模型能够较好地模拟所有试件的前期刚度和钢内管试件的极限承载力;PVC管和PPR管在轴压全过程中承担的轴向荷载及其与混凝土的相互作用几乎为零。
In order to study the influence of plastic products on the axial compressive performance of the concrete filled steel tubular hollow tube in place of the steel tube, a total of five specimens of concrete filled steel tube with square tube with inner tube of PVC pipe, PPR pipe and round pipe were designed. The axial compression tests of all specimens were carried out. The failure modes, load-longitudinal strain curves and combined moduli of the whole, core concrete and inner tube were analyzed. The whole process of axial compression of specimens was simulated by finite element software ABAQUS. The results show that the PVC pipe is fragile and brittle when subjected to pressure, while the PPR pipe and the round pipe have good resistance to plastic deformation. The arrangement of the ultimate bearing capacity and the combined elastic modulus from big to small is: PPR inner pipe test pieces and PVC inner pipe test pieces. The finite element model can well simulate the pre-rigidity of all the test pieces and the ultimate bearing capacity of the steel pipe test pieces. During the whole process of axial compression of the PVC pipe and the PPR pipe, Bear the axial load and its interaction with the concrete is almost zero.