[1]田会文,周臻,陆纪平,等.钢纤维掺量对FRP管约束超高性能混凝土轴压性能的影响[J].东南大学学报(自然科学版),2019,49(3):481-487.[doi:10.3969/j.issn.1001-0505.2019.03.011]
 Tian Huiwen,Zhou Zhen,Lu Jiping,et al.Effects of steel fiber content on axial compression performance of UHPC filled FRP tubes[J].Journal of Southeast University (Natural Science Edition),2019,49(3):481-487.[doi:10.3969/j.issn.1001-0505.2019.03.011]
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钢纤维掺量对FRP管约束超高性能混凝土轴压性能的影响()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
49
期数:
2019年第3期
页码:
481-487
栏目:
土木工程
出版日期:
2019-05-20

文章信息/Info

Title:
Effects of steel fiber content on axial compression performance of UHPC filled FRP tubes
作者:
田会文1周臻1陆纪平1韩方玉2
1东南大学混凝土及预应力混凝土结构教育部重点实验室, 南京 210096; 2江苏苏博特新材料股份有限公司, 南京 211103
Author(s):
Tian Huiwen1 Zhou Zhen1 Lu Jiping1 Han Fangyu2
1Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education, Southeast University, Nanjing 210096, China
2Jiangsu Sobute New Materials Co., Ltd., Nanjing 211103, China
关键词:
超高性能混凝土 FRP管约束 钢纤维掺量 轴压性能
Keywords:
ultra-high performance concrete(UHPC) fiber reinforced polymer(FRP)tube confined steel fiber content axial compressive performance
分类号:
TU375.4
DOI:
10.3969/j.issn.1001-0505.2019.03.011
摘要:
为研究钢纤维掺量对FRP管约束超高性能混凝土(UHPC)轴压性能的影响,以FRP管厚和钢纤维掺量为变量,设计制作了27个FRP管约束UHPC(UHPC-FFT)圆柱和9个无约束UHPC圆柱试件,通过单调轴压试验研究钢纤维掺量对不同约束刚度UHPC-FFT试件极限应变、抗压强度的影响.结果表明:FRP管厚是影响UHPC-FFT轴压性能的关键因素,增大管厚能大幅提高UHPC-FFT的抗压性能.管厚较小的UHPC-FFT试件变形经历线弹性、软化和线性强化3个阶段,而当管厚增大到能提供足够约束时,试件变形将从线弹性阶段直接过渡到线性强化阶段.加入钢纤维能减缓初始峰值荷载后的荷载突降,且试件破坏后仍保持为整体.钢纤维掺量的影响在管壁较薄的试件中表现得较为明显;当管壁足够厚时,钢纤维影响较小.
Abstract:
To study the effects of the steel fiber content on the axial compression performance of ultra-high performance concrete(UHPC)filled fiber reinforced polymer(FRP)tubes(UHPC-FFTs), 27 UHPC-FFTs and 9 unconfined UHPC cylinders were prepared and tested under monotonic uniaxial compression to investigate the influence of the steel fiber content on the compressive strength and the strain of the specimens with different FRP jacket stiffness. The results show that the FRP tube thickness is the key parameter influencing the axial behavior of UHP-CFFTs. The increase of the tube thickness can improve the compressive behavior of UHPC-FFTs. The axial load-axial strain curves of thinner tube specimens can be divided into three distinct sections including the linear elastic phase, the softening phase and the linear strengthening phase. However, with the increase of the tube thickness, the sufficient lateral confinement allows the skip of the softening phase. The sudden strength loss after the initial peak stress of UHPC-FFTs is weakened and its integrity is maintained with the introduction of steel fibers. The influence of the steel fiber is significant when the tube thickness is small. When the tube thickness is large enough, the influence of the steel fiber is insignificant.

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备注/Memo

备注/Memo:
收稿日期: 2018-10-20.
作者简介: 田会文(1994—),男,博士生;周臻(联系人),男,博士,教授,博士生导师,seuhj@163.com.
基金项目: 国家重点研发计划资助项目(2017YFC0703700).
引用本文: 田会文,周臻,陆纪平,等.钢纤维掺量对FRP管约束超高性能混凝土轴压性能的影响[J].东南大学学报(自然科学版),2019,49(3):481-487. DOI:10.3969/j.issn.1001-0505.2019.03.011.
更新日期/Last Update: 2019-05-20