离心钢管混凝土轴压构件的有限元分析

Finite element analysis of load bearing capacities of centrifuge concrete filled steel tube on axial load

为进一步研究离心钢管混凝土构件的作用机理,在钢-混凝土组合结构滑移试验结果的基础上,提出考虑滑移影响的离心钢管混凝土(CCFT)轴心受压极限承载能力的三维有限元模型.该模型采用非线性弹簧单元来模拟钢管与混凝土接触面处的三向滑移,同时在计算模型中分别反映出了离心混凝土与钢管的非线性特性,对CCFT轴心受压构件在轴向荷载作用下极限承载能力进行了分析,得到了离心钢管混凝土在轴压状态下结构、钢管与离心混凝土的全过程曲线,计算结果表明:理论结果与试验结果吻合良好,同时模型能很好地模拟钢管和混凝土两种材料在受力过程中相互间的黏结作用机理.

Based on bond-slip performance experiment, a three-dimensional elastic-plastic finite element model was presented to analyze the load bearing capacity of centrifuge concrete filled steel tube（CCFT） subjected to axial loading. The steel and centrifuge concrete constitutive model takes comprehensively all significant geometric nonlinearity exhibited by CCFT into account, and considers the significant inelastic phenomena in CCFT experiments. In addition, the finite element model accounts for the slip between the steel and centrifuge concrete components by incorporation of a nonlinear slip interface. This model can describe the behaviors ranging from perfect bond to immediate slip by three-dimensional nonlinear spring elements. The full axial-stress-strain and load-displacement curves of the composite construction, steel and centrifuge concrete were obtained. The finite element members subjected to axial loading, and formulations obtained by the proposed model have good agreement model was verified against the experiments of CCFT were simplified from preliminary studies. The values with the experimental results.