EPS混凝土的冲击力学行为及本构模型

摘要

Mechanical behavior of styropor concrete(EPSC) added with various volumetric fractions of EPS under high strain rates were studied by using large diameter SHPB. The influences of volumetric fractions and average strain rate on the dynamic properties of EPSC were investigated. A nonlinear viscoelastic constitutive model of EPSC was established based on test data. The experimental results showed that under high strain rate condition, the dynamic strength and the limit strain of EPSC are dependent on strain rate, the strain rate effect is linear; With increase in volumetric fractions of EPS, the impact compressive strength and the elastic modulus of EPSC decline, and the toughness of EPSC is reinforced.Comparison between the model output and test data indicates that this nonlinear viscoelastic constitutive model is able to describe high - strain - rate mechanical behavior of EPSC reasonably.%采用大直径分离式霍普金森压杆(SHPB)试验装置研究了多种EPS体积掺量的EPS混凝土在不同应变率下的力学行为.分析了平均应变率以及EPS体积掺量对EPS混凝土的冲击力学性能的影响.采用朱-王-唐(ZWT)模型,在试验研究的基础上,建立了EPS混凝土非线性粘弹性本构模型.结果表明:在高应变率条件下,EPS混凝土的动态抗压强度与极限应变随平均应变率的提高近似线性增长,呈现出显著的应变率相关性.随着EPS体积掺量的增加,混凝土的动态抗压强度和弹性模量降低,变形能力得到改善.本构模型提供的理论曲线与试验曲线比较接近,ZWT模型可以较为准确地描述EPS混凝土的高应变率力学行为.