中强混凝土应变率效应的试验研究与数值模拟

Experimental and numerical study on the effects of strain rate of middle strength concrete

试验研究了两种强度的混凝土C30和C50在地震作用应变率范围内（1×10^-5～1×10^-2／s）的力学行为。根据试验结果，回归分析得到了混凝土动力提高系数（DIF）的表达式，并与其他文献中的结果进行了对比。基于ABAQUS有限元软件，分别采用混凝土损伤塑性模型和Drucker—Prager模型对混凝土试块的动态抗压性能进行了数值模拟，并且讨论了这两种模型模拟混凝土动力特性时存在的问题。

The effects of strain rate on C30 and C50 grades concrete are investigated in tests at the strain rates（ 10^-5-10^-2/s ） that might be experienced during earthquakes in this paper.Based on the test result, the dynamic increasing factor of concrete is built, and the comparison with the models in other literature is made, concrete damaged plasticity model and Drucker-Prager model in ABAQUS finite element pro-gram is used to simulate the dynamic properties of concrete, and the problems in the two models are discussed.