轴拉水泥基复合材料中钢纤维变位约束细观桥联模型  

A Meso-Scale Variable Engagement Crack-Bridging Model in Axial Loaded Steel Fiber Reinforced Cementitious Composites

作　　者：俞家欢[1] 刘琼阳[1] 贾连光[1] 叶晔[2] 

机构地区：[1]沈阳建筑大学土木工程学院,辽宁沈阳110168 [2]辽宁省建筑设计研究院,辽宁沈阳110005

出　　处：《沈阳建筑大学学报（自然科学版）》2009年第1期116-120,共5页Journal of Shenyang Jianzhu University：Natural Science

基　　金：辽宁省教育厅A类项目(05L365)

摘　　要：目的从细观尺度研究受拉水泥基复合材料中倾斜纤维的桥联行为,解决承受轴拉的随机各向分布纤维增强混凝土的断裂问题.方法将单根随机纤维的理论解在三维空间进行积分运算.结果提出了变位约束细观模型,推导出拉拔力与裂纹张开位移及纤维倾斜角的函数关系式,纤维拉应力与剪切应力成正比.绘制该模型下的圆直纤维混凝土σ-ω曲线与试验结果吻合性较好.结论笔者提出的弹性模型可较好地模拟纤维破坏机理.The crack - bridging behavior of inclined steel fiber in cementitious composites was researched in the meso - scale to analyze the mechanical behavior of fiber reinforced concrete at random distribution which carries the pull - out force. The theoretical solution of a single fiber distributed randomly was integrated in the 3D space to describe the change course of the pull - out fiber concrete. Meso - scale variable engagement model was proposed. The function relation of the pull - out force with crack open displacement and fiber inclined angle was presented. The fiber tension stress was proportional to shear stress. The theoretical value and experimental value was consistency. The model could preferably simulate fiber failure mechanism.

关 键 词：裂纹张开位移 拉拔力 变位约束细观模型 端钩纤维 

分 类 号：TU672.2[建筑科学—建筑技术科学]