硅酸盐通报2026，Vol.45Issue(7)：2275-2289,15.DOI:10.16552/j.cnki.issn1001-1625.2025.1236
剥落区和界面剪应力对超高性能混凝土纤维拔出行为的影响
Effects of Spalling Area and Interfacial Shear Stress on Fiber Pullout Behavior in Ultra-High Performance Concrete
向孤聪 1牛艳飞 1林喜华 2袁棕 2郭彦龙 3袁利军3
作者信息
- 1. 广州大学土木与交通工程学院,广州 510006
- 2. 中建西部建设集团第四(广东)有限公司,广州 510800
- 3. 中建三局第三建设工程有限责任公司,武汉 430074
- 折叠
摘要
Abstract
To investigate the influence of the spalling zone and interfacial shear stress on the pullout behavior of steel fibers in ultra-high performance concrete(UHPC),the pullout behavior of steel fibers at different curing ages(7,14,28 d)and embedment angles(0°,30°,45°,60°)was studied.The degree of matrix spalling was evaluated,and the pullout behavior was analyzed using a micromechanical model.The results show that the pullout load and average bond strength are maximized at 45° for different embedment angles,while the maximum pullout energy occurrs at 60°.The spalling area of the matrix is less affected by the curing age but significantly influenced by the embedment angle,with the maximum spalling area occurring at 60°.An equation is established to describe the relationship between the spalling area and the embedment angle.The degradation of interfacial shear stress determines the trend of the descending branch(debonding stage),with the shape changing from concave to convex and the curvature of the convex shape gradually increasing with different curing ages and embedment angles.Extending the value of shape coefficient η from 0.10 to-0.05 and introducing an interfacial enhancement factor b with a range of values from-8 to-2 can effectively evaluate the change of the interfacial shear stress,the results of the numerical analysis are in good agreement with experimental results.关键词
超高性能混凝土(UHPC)/嵌入角/拔出行为/基体剥落/界面剪应力/细观力学模型Key words
ultra-high performance concrete(UHPC)/embedment angle/pullout behavior/matrix spalling/interfacial shear stress/micromechanical model分类
建筑与水利引用本文复制引用
向孤聪,牛艳飞,林喜华,袁棕,郭彦龙,袁利军..剥落区和界面剪应力对超高性能混凝土纤维拔出行为的影响[J].硅酸盐通报,2026,45(7):2275-2289,15.
