基于三点开口梁弯曲试验分析3D端钩钢纤维混凝土抗弯性能

硅酸盐通报 ›› 2023, Vol. 42 ›› Issue (5): 1661-1671.

所属专题：水泥混凝土

基于三点开口梁弯曲试验分析3D端钩钢纤维混凝土抗弯性能

吴礼程^1,2, 陈湘生², 雷江松¹, 郑爱元^1,3, 王雪涛^2,4, 邓一三⁵

1.深圳市地铁集团有限公司,深圳 518026;
2.深圳大学土木与交通工程学院,深圳 518060;
3.深圳铁路投资建设集团有限公司,深圳 518026;
4.深圳机场集团扩建工程指挥部,深圳 518034;
5.中铁科学研究院有限公司,成都 610032

收稿日期:2023-01-29 修订日期:2023-03-07 出版日期:2023-05-15 发布日期:2023-06-01
作者简介:吴礼程(1989—),男,博士。主要从事混凝土力学性能以及盾构隧道结构计算分析的研究。E-mail:licheng_wu1989@sina.com
基金资助:
广东省重点领域研发计划项目(2019B111105001);深圳市地铁集团有限公司资助项目(SZDT-JSZX-ZC-2020-0022)

Analysis of Flexural Performance of 3D Hooked-End Steel Fiber Reinforced Concrete Based on Three-Point Bending Test of Notched Beam

WU Licheng^1,2, CHEN Xiangsheng², LEI Jiangsong¹, ZHENG Aiyuan^1,3, WANG Xuetao^2,4, DENG Yisan⁵

1. Shenzhen Metro Group Co., Ltd., Shenzhen 518026, China;
2. College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, China;
3. Shenzhen Railway Investment and Construction Group Co., Ltd., Shenzhen 518026, China;
4. Expansion Project Headquaters, Shenzhen Airport Group, Shenzhen 518034, China;
5. China Railway Academy Co., Ltd., Chengdu 610032, China

Received:2023-01-29 Revised:2023-03-07 Online:2023-05-15 Published:2023-06-01

摘要/Abstract

摘要： 选用7种不同3D端钩钢纤维掺量的混凝土开口梁构件为研究对象进行了三点弯曲试验,结合数字图像相关(DIC)技术研究了不同3D端钩钢纤维掺量对混凝土开口梁构件抗弯性能的影响。结果表明,3D端钩钢纤维混凝土开口梁构件具有优异的抗弯韧性,其荷载-裂缝开口位移(CMOD)曲线有两个峰值,除3D端钩钢纤维掺量为25 kg/m³的构件的第二峰值与第一峰值之比为0.91外,其他含3D端钩钢纤维构件的第二峰值与第一峰值之比均大于1。基于分析得到了不同3D端钩钢纤维掺量下混凝土开口梁构件的CMOD-挠度关系以及耗散能分布情况。根据DIC数据分析结果,验证了平截面假定在不同3D端钩钢纤维掺量下混凝土开口梁构件抗弯分析中的适用性,并得出了弯曲过程中中性轴位置的变化规律。基于3D端钩钢纤维的拉拔过程分析了3D端钩钢纤维混凝土的拉伸与弯曲破坏机理。

关键词: 混凝土, 3D端钩钢纤维, 开口梁, 抗弯性能, 荷载-CMOD曲线, 耗散能, 平截面假定, 破坏机理

Abstract: Three-point bending tests were carried out on concrete notched beam specimens with seven kinds of 3D hooked-end steel fiber content. The influence of different 3D hooked-end steel fiber content on the flexural performance of concrete notched beam specimens was studied with digital image correlation (DIC) technology. According to the test result, it shows that concrete notched beam specimens with 3D hooked-end steel fiber have excellent bending toughness. The load-crack mouth opening displacement (CMOD) curve of concrete notched beam specimens with 3D hooked-end steel fiber has two peak values. Except that the ratio of the second peak to the first peak of concrete notched beam specimen with 3D hooked-end steel fiber content of 25 kg/m³ is 0.91, the other concrete notched beam specimens with 3D hooked-end steel fiber are greater than 1. Based on the analysis, the CMOD-deflection relationship and dissipation energy of concrete notched beam specimens with different 3D hooked-end steel fiber content were obtained. According to the analysis results of DIC data, the applicability of the plane section assumption in the bending analysis of concrete notched beam specimens with different 3D hooked-end steel fiber content is verified, and the change rule of neutral axis position during bending is obtained. Based on the pullout process of 3D hooked-end steel fiber, the tensile and bending failure mechanism of 3D hooked-end steel fiber reinforced concrete were analyzed.

Key words: concrete, 3D hooked-end steel fiber, notched beam, flexural performance, load-CMOD curve, dissipation energy, plane section assumption, failure mechanism

中图分类号:

TU528.572

吴礼程, 陈湘生, 雷江松, 郑爱元, 王雪涛, 邓一三. 基于三点开口梁弯曲试验分析3D端钩钢纤维混凝土抗弯性能[J]. 硅酸盐通报, 2023, 42(5): 1661-1671.

WU Licheng, CHEN Xiangsheng, LEI Jiangsong, ZHENG Aiyuan, WANG Xuetao, DENG Yisan. Analysis of Flexural Performance of 3D Hooked-End Steel Fiber Reinforced Concrete Based on Three-Point Bending Test of Notched Beam[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(5): 1661-1671.

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基于三点开口梁弯曲试验分析3D端钩钢纤维混凝土抗弯性能

Analysis of Flexural Performance of 3D Hooked-End Steel Fiber Reinforced Concrete Based on Three-Point Bending Test of Notched Beam

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