摘要
根据一致粘塑性模型理论,结合所做的混凝土单轴动力特性试验,对常用的混凝土本构模型Drucker-Prager模型进行改进,引入应变率的影响,推导了Drucker-Prager材料的一致率型本构模型;并与试验的应力应变曲线进行比较,结果表明本文模型能够较好地反映混凝土的动力特性;最后,通过对一平面梁进行计算,并与线弹性及率无关塑性结果进行比较,结果表明考虑了应变率的影响后梁的动力特性发生了较大的变化。
According to viscoplastic consistency model and the dynamic experimental results of concrete, a Drucker-Prager consistent rate-dependent model is set up. It evolves from the classical Drucker-Prager model by incorporating the effect of strain rate on concrete. Compared with experiment results, the model can predict the dynamic behavior of concrete accurately. A plane beam is studied using the model. The results are compared with those of the linear elastic model and rate-independent plastic model. The comparison shows that the dynamic behavior of the beam exhibits significant change when the effect of strain rate is considered.
出处
《工程力学》
EI
CSCD
北大核心
2003年第4期147-151,共5页
Engineering Mechanics
基金
国家自然科学基金资助重点项目(50139010)
关键词
粘塑性
率相关
应变率
内变量
动力反应
viscoplastic
rate-dependent
strain rate
internal variable
dynamic response
