设置横隔板方钢管混凝土柱轴压性能有限元非线性分析

NONLINEAR ANALYSIS OF FEM ON THE COMPRESSIVE BEHAVIOR OF THE SQUARE CFST COLUMNS WITH DIAPHRAGMS

钢管混凝土柱受压性能研究中,有限元非线性分析是重要的研究手段,而材料本构模型选用更是提高分析精度的关键因素。本文设置横隔板方钢管混凝土柱的有限元非线性分析中,约束混凝土采用Han本构模型,钢材采用考虑应变硬化段的弹塑性模型。分析结果表明,按照所选用的材料本构模型,数值模拟与实测荷载-应变曲线的上升段吻合较好,下降段存在差异,材料本构模型的下降段有待优化。

In the study of compressive behavior of concrete filled steel tube （CFST） columns, the nonlinear analysis of finite element method （FEM） is an important means. The key is the usage of material constitutive models which decides the precision of FEM analysis. In this paper, the Han＇s constitutive model was selected in confined concrete and the elasto-plastic model considering strain hardening was used in roiled steel. The results of analysis indicate that the curves of simulation and test have a good agreement in the ascending stage of the cures instead of the descending stage based on the selected material constitutive models, which needs to optimize in the further work.