钢管混凝土抗震性能ABAQUS数值模拟中损伤因子比较研究

Comparison Study on Damage Factor in ABAQUS for Seismic Simulation of Concrete Filled Steel Tube

针对国内外3种不同的混凝土损伤计算模型,分别用其模拟计算了往复荷载下钢管混凝土损伤过程,并绘出了3种模型损伤因子随应变变化的曲线;对于Birtel和Mark模型,探讨了系数bc对损伤因子的影响,随着系数bc取值的减小,相同应变下对应的损伤因子值增大;最后将这3种模型有限元计算得到的往复荷载下钢管混凝土构件的骨架曲线与试验骨架曲线进行对比分析。比较结果表明:当Birtel和Mark模型中bc取0.5时,计算得到的荷载(P)-位移(Δ)骨架曲线与试验结果误差最小,基于高斯积分算法的余能模型算出的骨架曲线与试验结果误差其次,修正的余能模型算出的骨架曲线与试验结果误差最大。

Aiming at three different concrete damage computational models at home and abroad, the study utilized them to simulate the damage process of concrete-filled steel tube under cyclic loading respectively. The damage factor varying with strain for the three models was drawn. For Birtel and Mark model, the impact of coefficient in the model on the damage factor was also discussed. With the decrease of the coefficient, the damage factor increased under the same strain. Finally, the CFST skeleton curve of the FEM numerical solutions was compared with that of the test results under cyclic loading. It shows by the comparison that when in the Birtel and Mark modelit was 0.5, the load（P）- displacement（Δ） skeleton curve was in good agreement with the test results; the load（P）- displacement（Δ） skeleton curve by the complementary energy model had less errors, second to Birtel and Mark model compared to test results, but that of the modified complementary energy model had the largest errors in the three models.