配筋钢管混凝土局部受压力学性能有限元研究

Finite element study on local compressive behavior of reinforced concrete-filled steel tube

在配筋钢管混凝土局部受压试验的基础上,共设计了36个配筋钢管混凝土试件和2个普通钢筋混凝土试件,利用ABAQUS有限元软件进行建模和数值分析,研究了外钢管壁厚、受压面积、有无钢筋笼等参数变化对试件轴向受压力学性能的效果。这项研究展现了复式钢管混凝土构件在轴向局部承压荷载作用下的性能表现,这对于工程设计提供了参考范例。结果表明,模拟所得的配筋钢管混凝土柱在局部受压时的破坏现象与试验结果一致,主要表现为垫块被压入混凝土内部,同时试件上端的钢管出现向外鼓曲的情况。鼓曲程度随β的增大而减小。试件局压承载力随着钢管厚度增加而增加,随着局压面积比增加而降低,相同含钢率下,使用配筋钢管混凝土比钢管混凝土更加有利。

Based on the experimental investigation of local compressive behavior of concrete-filled steel tube,a total of 36 specimens of reinforced concrete-filled steel tube and 2 specimens of conventional reinforced concrete were designed in this study.Numerical analysis was conducted using ABAQUS finite element software to explore the influence of parameters such as local compression ratio,outer tube thickness,and the presence of reinforcing cage on the axial local compressive mechanical properties of the specimens.The study aimed to reveal the working mechanism of reinforced concrete-filled steel tube columns under local compression conditions and provide technical references for engineering design.The results indicated that the simulated failure mode of reinforced concrete-filled steel tube columns was consistent with the experimental observations.The failure mode involved the pressing of bearing blocks into the concrete,causing the upper end of the outer tube to bulge outward.The extent of bulging decreased with an increase in the parameterβ.The local compressive load-bearing capacity of the specimens increased with an increase in tube thickness,but decreased with an increase in local compression ratio.Under the same steel content ratio,the use of reinforced concrete-filled steel tube was more advantageous than conventional concrete-filled steel tube.