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在合理选取钢材和混凝土本构模型以及正确定义单元类型、模型接触和边界条件等的基础上,采用有限元分析软件ABAQUS建立了纯扭作用下内置十字形钢骨的圆形截面钢管混凝土构件有限元分析模型,并对钢骨混凝土和钢管混凝土纯扭构件进行数值建模且与已有相关试验进行了对比验证。对典型构件受力全过程的荷载-变形曲线、应力分布特征以及扭矩分配状况进行了研究,最后对混凝土强度、钢管材料强度、钢管含钢率、钢骨含钢率、钢骨材料强度和长细比等主要影响因素进行了参数分析。研究表明:当内置十字形钢骨的圆形截面钢管混凝土构件受扭时外围钢管承受更多扭矩;钢管材料强度、钢管含钢率和长细比对构件扭矩-截面纤维最大剪应变曲线影响较显著;内置十字形钢骨的圆形截面钢管混凝土具有较高的扭转承载力。
Based on the reasonable selection of steel and concrete constitutive models and the correct definition of element types, model contact and boundary conditions, the finite element analysis software ABAQUS was used to establish finite element of circular CFST members with built-in cruciform steel under pure torsion Meta-analysis model, and numerical simulation of pure torsion members of SRC and CFST is carried out and compared with the existing related tests. The load-deformation curves, stress distribution characteristics and torque distribution of typical components are studied. Finally, the influence of concrete strength, strength of steel pipe, steel content, steel content, steel strength and elongation Thin ratio and other major influencing factors were analyzed. The results show that the external steel tube receives more torque when the circular cross-section CFST with built-in cross-section steel is torsioned. The influence of the material strength of the steel tube, the steel ratio of the steel tube and the slenderness ratio on the maximum shear strain curve of the torsional- Significant; circular cross-section CFST with built-in cross-shaped steel has high torsional bearing capacity.