摘要
利用MTS810和直径为74 mm的大尺寸SHPB实验装置开展了钢纤维混凝土的动静态力学性能实验.实验结果表明钢纤维混凝土是一种具有非常明显的钢纤维增强、增韧效应的应变率敏感材料.根据实验应力应变曲线的基本特征,提出了一种钢纤维混凝土的含损伤本构模型.该模型在考虑钢纤维增强、应变率硬化、损伤软化等因素下,描述了钢纤维混凝土的受力响应特性.
The Quasi-static and dynamic mechanical properties of steel fiber reinforced concrete （SFRC） were investigated by MTS and SHPB. The experimental results showed that SFRC is a material with obvious steel reinforcing, toughening, and strain-rate hardening properties. According to the basic characteristics of the experimental stress-strain curves, a damage constitutive model including the effect of steel fiber reinforcing and strain-rate hardening and damage softening was proposed and the stress-strain
curves tested prove the effectiveness of the model.
基金
国家自然科学基金(10402041)资助
关键词
钢纤维混凝土
应变率
本构关系
损伤
steel fiber reinforced concrete
strain-rate
constitutive relation
damage
