混凝土四参数动态本构模型

在混凝土动力抗拉抗压试验的基础上,根据一致黏塑性本构模型的概念,考虑静水压力和应变率的影响,推导了改进的一致率型HTC四参数模型,并与试验的应力应变曲线进行比较,结果表明模型能够较好地反应混凝土的动力特性;最后,用此模型对混凝土简支梁进行非线性动力反应分析,并与线弹性模型和率无关HTC四参数模型进行比较,探讨应变率对其动力特性的影响.结果表明考虑应变率的影响后,梁的位移、应力大小都发生了较大的变化.

Four-parameter dynamic constitutive model of concrete

According to the results of dynamic tensile and compressive experiments of concrete and the concept of consistency viscoplastic constitutive model,a modified consistency viscoplastic HTC four-parameter model is developed with the consideration of the effects of hydrostatic pressure and strain rate.Compared this model with experimental results,it shows that the model can well represent uniaxial dynamic tension and compression behavior of concrete.Finally,nonlinear dynamic responses of a simple-supporting beam are analyzed with this model,and the calculated results are compared with those of linear elastic model and rate-independent HTC four-parameter model,and then the effects of strain rate on concrete structure is investigated.Results show that the displacement and the stress magnitude change greatly after considering the effect of strain rate.