内置十字钢骨圆钢管混凝土构件受弯性能有限元分析

FEA of concrete-filled circular steel tubular members with inner cross-shaped steel under bending load

在合理选取钢材和混凝土材料本构关系模型的基础上,采用有限元分析软件ABAQUS对部分圆形截面的钢管混凝土受弯构件以及2个内置十字钢骨圆钢管混凝土构件的受弯性能试验进行有限元模拟,并设计内配十字钢骨圆钢管混凝土受弯构件,研究其在荷载作用下的受力特征,并进行混凝土强度、钢管及钢骨屈服强度、钢管及钢骨截面含钢率等参数分析。结果表明:典型受弯构件的挠度曲线近似为正弦半波曲线;弯矩-曲率曲线大致可分为弹性段、弹塑性段和塑性强化段;钢管截面含钢率对构件受弯承载力的影响比较显著,型钢材料强度对其影响很小。

Based on the reasonable material models of concrete and steel,finite element( FE) models of concrete-filled steel tubular members( CFST) and concrete-filled circular steel tubular members with inner cross-shaped steel under bending load were established and verified by the experimental results using the ABAQUS software. Then the typical member of concrete-filled circular steel tubes with inner cross-shaped steel under bending load was designed to investigate the mechanical characteristic and working mechanism. The parametric study of the main factors,such as core concrete serength,material yield strength of steel tube and cross-shaped steel,steel ratio of tube and cross-shaped steel,was also carried out to research the rules. The results show that the deflection curve of the typical bending member can be regarded as sine half-wave curve. The M-φ curves can be divided into elastic stage,elasto-plastic stage and plastic hardening stage. The ratio of steel tube has a significant influence on the bending capacity while the strength of cross-shaped steel has little influence.