不同类型钢纤维UHPC无腹筋梁受剪性能试验
Experiment on shear performance of different types of steel fiber UHPC beams without stirrups
曹霞 1任义成 2廉德铭 3金凌志 1李丽 1何达波1
作者信息
- 1. 桂林理工大学 广西建筑新能源与节能重点实验室,广西 桂林 541004
- 2. 桂林理工大学 广西建筑新能源与节能重点实验室,广西 桂林 541004;江苏大学京江学院 材料与土木工程学院,江苏 镇江 212000
- 3. 桂林电子科技大学 基建处,广西 桂林 541004
- 折叠
摘要
基于单点加载下 4 根超高性能混凝土无腹筋梁构件受剪破坏试验结果,研究其受剪性能,以钢纤维类型为主要研究参数,分析钢纤维类型对无腹筋梁的受剪承载力、裂缝发展形态、挠度和韧性等发展规律.结果表明:端钩型钢纤维对提高超高性能混凝土无腹筋梁的受剪承载力、阻滞裂缝发展及控制试件变形能力作用优于光滑平直型和波浪型钢纤维,而端钩型Ⅱ钢纤维优于端钩型Ⅰ钢纤维;端钩型Ⅰ和光滑平直型钢纤维增韧效果较好,但分担纵筋拉力较少;波浪型钢纤维分担纵筋拉力较多,提高超高性能混凝土无腹筋梁抗裂性的效果较好,但增韧效果较差.经对比分析,陈璇公式计算值精确度较高,离散程度小.
Abstract
The shear behavior of ultra-high-performance concrete(UHPC)beams without stirrups was investiga-ted through the single-point loading.Four UHPC beams with different steel fibers were tested until shear failure.The shear capacity,crack,deflection,and toughness were investigated in detail.The results show that the end-hook steel fiber has the better influence on the shear capacity,crack development and deformation,followed by smooth and straight steel fibers.The end-hook type Ⅱ steel fibers are better than end-hook type Ⅰ steel fibers.End-hook type Ⅰ steel fibers and smooth and straight steel fibers have better toughening effect,but share less longitudinal reinforcement tension.The wavy steel fibers share more longitudinal reinforcement tension.The wavy steel fibers improve the crack resistance of UHPC beams better without stirrups,but toughening effect is poorer.By comparison and analysis,the equation by Chen Xuan provides the best prediction accuracy.
关键词
超高性能混凝土梁/钢纤维类型/受剪承载力/裂缝/韧性Key words
ultra-high performance concrete beam/steel fiber type/shear load capacity/crack/toughness引用本文复制引用
基金项目
国家自然科学基金(51368013)
广西建筑新能源与节能重点实验室项目(桂科能19-J-21-6)
广西中青年教师科研基础能力提升项目(2019KY0267)
出版年
2024
国家科技期刊平台
NSTL
万方数据