钢纤维类型及数量对UHPC拉伸性能影响研究  

Study on the Effect of Steel Fiber Type and Quantity on the Tensile Properties of UHPC

作　　者：张宝东 赵冰洁 邓永刚[1] ZHANG Baodong;ZHAO Bingjie;DENG Yonggang(Shenyang Ligong University,Shenyang 110159,China)

机构地区：[1]沈阳理工大学材料科学与工程学院,沈阳110159

出　　处：《沈阳理工大学学报》2022年第1期51-56,94,共7页Journal of Shenyang Ligong University

基　　金：国防基础科研计划项目。

摘　　要：为提高纤维增强超高性能混凝土(UHPC)的拉伸性能,采用三种类型钢纤维在不同纤维数量下对混凝土拉伸破坏行为进行研究。试验结果表明:掺入纤维可显著提高混凝土拉伸能力;掺入波纹型钢纤维可使纤维增强UHPC达到最佳拉伸性能,直线型和端勾型钢纤维次之;端勾型钢纤维增强UHPC的抗拉性能较差的原因是过度的机械锚固和应力集中造成严重基体损伤,导致基体强度不足。采用Abaqus软件模拟不同类型纤维掺入对纤维增强UHPC拉伸应力状态和破坏形式的影响,模拟结果与试验结果基本一致。To improve the tensile performance of fiber-reinforced ultra-high performance concrete(UHPC),three types of steel fibers were used to study the tensile damage behavior of concrete at different fiber quantity.The test results showed that:fiber incorporation significantly improved the tensile capacity of concrete;incorporation of corrugated type steel fibers resulted in the best tensile performance of fiber-reinforced UHPC,followed by linear and end-hook type steel fibers;the poor tensile performance of end-hook type steel fiber-reinforced UHPC was due to excessive mechanical anchorage and stress concentration causing severe matrix damage,resulting in insufficient matrix strength.Abaqus software was used to simulate the effects of different types of fiber incorporation on the tensile stress state and damage form of fiber-reinforced UHPC,and the simulation results were basically consistent with the experimental results.

关 键 词：钢纤维 超高性能混凝土 拉伸性能 机械锚固 应力集中 

分 类 号：TG442[金属学及工艺—焊接]