混凝土HJC、RHT本构模型的失效强度参数

The Failure Strength Parameters of HJC and RHT Concrete Constitutive Models

通过对LS-DYNA、AUTODYN数值软件中混凝土HJC、RHT本构模型失效强度参数的分析计算,发现原始失效强度参数在较高静水压下将导致混凝土失效强度降低。提出了利用混凝土的特征强度确定HJC、RHT失效强度参数的方法,并通过计算得出了校验后的失效强度参数值。最后,使用校验前后的失效强度参数进行了混凝土侵彻实验的数值模拟。计算结果表明:使用校验后参数的数值模拟结果与实验结果更为吻合。由于HJC本构模型中没有引入偏应力张量第三不变量,所以结果不够满意。

The analyzed and calculated results indicate that the concrete failure strength will decrease under higher hydrostatic pressure,when the original failure parameters of HJC and RHT models implemented in LS-DYNA and AUTODYN are adopted.A new method is introduced which using the characteristic strength of concrete to confirm the modified failure parameters of HJC and RHT models.The same physical experiment of concrete penetration was simulated using the modified HJC and RHT failure parameters respectively,and the numerical results demonstrated that the RHT model matched the experiments much better.But the numerical results with the HJC modified failure parameters were not enough satisfied,because the third invariant of the deviated stress tensor was not considered in the HJC model.