轴拉钢纤维混凝土变位约束模型的细观力学解法  

Micromechanic Solution of Variable Engagement Model for Fibre-Reinforced Concrete under Uniaxial Tension

作　　者：俞家欢[1] 孙明[1] 张峰 

机构地区：[1]沈阳建筑大学土木工程学院,辽宁沈阳110168 [2]山东同圆设计集团有限公司,山东济南250001

出　　处：《沈阳建筑大学学报（自然科学版）》2009年第5期920-924,共5页Journal of Shenyang Jianzhu University：Natural Science

基　　金：教育部春晖计划项目(2007);辽宁省教育厅基金项目(05L365)

摘　　要：目的研究细观约束变位模型,解决承受轴拉的随机各向分布纤维增强混凝土的力学性能.方法通过将单根随机纤维的理论解在三维空间进行积分运算可以有效地描述受拉纤维混凝土的受力过程.结果给出拉拔力与裂纹张开位移及纤维倾斜角的函数关系,所绘制的圆直纤维混凝土σ-ω曲线与试验结果有较好的一致性.结论该弹性模型可以较好地模拟纤维的破坏机理,但将其扩展为弹塑性模型以模拟加载。Micromechanical Variable Engagement Model is developed in this paper to describe the behaviour of randomly orientated discontinuous fibre reinforced composites subject to uniaxial tension. The model is developed by integrating the behaviour of single, randomly oriented fibres over 3D space, and it is capable of describing the response of fibre-cement-based composites in tension. The functional relationship of pullout load, crack opening displacement, and inclined angle are demonstrated. The σ-ω curves of fibre reinforced concrete show good agreement with the experimental results. The analytical results show that the model can preliminarily simulate the elastic pullout behaviour of inclined steel crack-bridging fibre. But the elastic-plastic model still requires more profound research.

关 键 词：纤维混凝土 裂纹张开位移 拉拔力 变位约束细观模型 

分 类 号：TU528.572[建筑科学—建筑技术科学]