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阐述了循环加载下软钢材料应力—应变的理想弹塑性模型、双线性随动强化模型和混合模型,采用有限元软件ANSYS对菱形开洞软钢阻尼器进行数值模拟,得出与所列本构模型相对应的阻尼力滞回曲线,并比较各模型的优缺点及误差存在原因;建立了基于混合模型的90°、60°和45°菱形开洞软钢阻尼器的阻尼力滞回曲线,将其力学参数值与理论分析结果进行比较。分析结果表明:混合模型下,菱形开洞软钢阻尼器的力学参数值和理论计算值一致,且阻尼力滞回曲线能很好地和试验曲线相吻合,验证了混合模型是菱形开洞软钢阻尼器相对比较精确的本构模型。
The ideal elastic-plastic model, bilinear kinematic hardening model and mixed model of mild steel under cyclic loading are described. The finite element software ANSYS is used to simulate the diamond-shaped mild steel damper with numerical results. The hysteresis curves of the damping force corresponding to the constitutive model are compared and the advantages and disadvantages of each model and the causes of the errors are compared. The damping force hysteresis of the mild steel dampers with 90 °, 60 ° and 45 ° rhombus openings based on the hybrid model is established Curve, the mechanical parameter values and theoretical analysis results are compared. The results show that the mechanical parameters of the diamond-shaped mild steel damper are in agreement with the theoretical values under the hybrid model, and the damping force hysteresis curve is in good agreement with the experimental curve. It is verified that the mixed model is a diamond-shaped hole-opening soft Relatively accurate constitutive model of steel dampers.