水泥基体中弓形钢纤维拔出耗能模型

Modeling Pullout Energy of Hooked End Steel Fiber in Cementitious Matrices

摘要:

鉴于弓形钢纤维几何形状的特殊性，对弓形钢纤维拔出过程中的摩擦能量和弯钩端塑性变形能量分别进行了理论推导；并采用能量叠加法完成了水泥基体中弓形钢纤维拔出能耗理论计算.模型预测结果与试验结果的验证表明，不论是对部分拔出还是全部拔出的弓形钢纤维拔出能量预测均与试验结果较为吻合，模型具有较好的准确性，这将有利于今后弓形钢纤维增强水泥基材料宏观断裂能理论预测研究工作的开展.

关键词:水泥基材料; 弓形钢纤维; 摩擦能量; 塑性变形能量; 模型预测

Abstract:

Due to the unique geometry of hooked end steel fiber(HSF),frictional pullout energy of HSF and plastic deformation energy of steel fiber hooked end during fiber pullout process were theoretically derived,respectively.Then,energy superposition principle was adopted to calculate the total energy consumption during HSF pullout process.Good performances that were obtained in comparison with experimental results of single HSF pullout test well support the validity and accuracy of this proposed model,which indicate applicability of this model to a further prediction of fracture energy of hooked end steel fiber reinforced cementitious composites (HSFRCC).

Key words:cementitious matrices; hooked end steel fiber (HSF); frictional pullout energy; plastic deformation energy; modeling prediction