摘要
主要从细观尺度研究水泥基复合材料中倾斜钢纤维的桥联行为。对纤维在基体中的埋入部分采用杆元近似,基体之外的部分,根据其弹性或塑性状态分别作悬臂梁或塑性铰近似,从而简化为两种构形。结合这两种构形和杆元近似,并采用经典的描述轴向行为的Naaman剪滞模型,同时引入纤维的侧向有效承载面积来描述基体局部失效效应,推导了描述高模量倾斜钢纤维桥联行为全过程的解析模型。模型预测的桥联行为与实验有较好的一致性。
The crack-bridging behavior of inclined steel fiber in cementitious composites is discussed at meso-scale in this paper. The embedded part of the fiber in the cementitious composites is assumed to act as a bar, while the part of the fiber outside the matrix is simplified into two configurations, cantilever beam for elastic fiber and plastic joint for elastoplastic fiber. The Naaman抯 shear lag model is adopted for the axial control relation. A concept of lateral effective load-bearing area is adopted to simplify the description of the effects of local spalling or crushing in matrix around the fiber. An analytical debonding and pullout model for high modulus inclined fiber is constructed. Results show that the model can preliminarily simulate the elastoplastic pullout behavior of inclined high modulus crack-bridging fiber.
出处
《工程力学》
EI
CSCD
北大核心
2004年第3期138-145,共8页
Engineering Mechanics
基金
国家自然科学基金青年基金资助项目(10202022)
并得到冲击波物理和爆轰波物理国防重点实验室和中科院材料力学行为和设计重点实验室(LMBD)资助
关键词
工程力学
模型研究
细观桥联
倾斜纤维
钢纤维
水泥基复合材料
engineering mechanics
model study
meso-scale crack-bridging
inclined fiber
steel fiber
cementitious composites
