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基于相关试验数据验证数值分析方法后,利用ABAQUS软件对冷弯圆钢管压弯构件的滞回性能进行参数分析。施加整体和局部初始几何缺陷,考虑冷弯加工方式对构件材料特性的影响,采用S4R单元以局部细化网格尺寸方式建模,依据ECCS加载制度,对直径219mm,厚度分别为6,8,10,12mm,长细比分别为30,60,90,轴压比分别为0.2,0.4,0.6的圆钢管算例进行了常轴力、循环弯矩作用下的有限元分析;对圆钢管的极限承载力、延性系数、能量耗散系数等滞回性能指标进行了分析;探讨了径厚比、长细比和轴压比等参数变化对圆钢管滞回特性的影响。结果表明,随径厚比、长细比和轴压比的增加,圆钢管的极限承载能力和刚度降低,而耗能能力则受不同程度的影响。
After validating the numerical analysis method based on the relevant test data, the parameters of the hysteretic behavior of the cold-rolled steel tubular members were analyzed by ABAQUS software. The global and local initial geometric imperfections were applied. Considering the influence of the cold-formed processing method on the material properties of the component, the S4R element was modeled by locally refined grid size. 10,12mm, slenderness ratio of 30,60,90, respectively, the axial compression ratio of 0.2,0.4,0.6 round steel cases were carried out under the action of constant axial force and cyclic bending moment finite element analysis; The ultimate bearing capacity, ductility coefficient, energy dissipation coefficient and other hysteretic performance indexes were analyzed. The effects of parameters such as aspect ratio, slenderness ratio and axial compression ratio on the hysteretic behavior of round steel tube were discussed. The results show that with the increase of diameter to thickness ratio, slenderness ratio and axial compression ratio, the ultimate bearing capacity and stiffness of the round steel pipe decrease, while the energy dissipation capacity is affected to some extent.