[1]张亚芳,郭中祥,刘浩,等.埋深对双丝拉拔试件动态破裂性能的影响[J].深圳大学学报理工版,2020,37(4):381-388.[doi:10.3724/SP.J.1249.2020.04381]
 ZHANG Yafang,GUO Zhongxiang,LIU Hao,et al.Influence of embedment depth on dynamic failure property of twin fibers pull-out test[J].Journal of Shenzhen University Science and Engineering,2020,37(4):381-388.[doi:10.3724/SP.J.1249.2020.04381]
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埋深对双丝拉拔试件动态破裂性能的影响()
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《深圳大学学报理工版》[ISSN:1000-2618/CN:44-1401/N]

卷:
第37卷
期数:
2020年第4期
页码:
381-388
栏目:
土木建筑工程
出版日期:
2020-07-15

文章信息/Info

Title:
Influence of embedment depth on dynamic failure property of twin fibers pull-out test
文章编号:
202004007
作者:
张亚芳1郭中祥1刘浩12何娟1
1)广州大学土木工程学院,广东广州 510006
2)深圳市市政设计研究院有限公司,广东深圳 518029
Author(s):
ZHANG Yafang1 GUO Zhongxiang1 LIU Hao1 2 and HE Juan1
1) Faculty of Civil Engineering, Guangzhou University, Guangzhou 510006, Guangdong Province, P.R.China
2) Shenzhen Municipal Design & Research Institute Co. Ltd., Shenzhen 518029, Guangdong Province, P.R.China
关键词:
混凝土双丝拉拔动态破坏过程数值模拟埋深破裂性能
Keywords:
concrete twin fibers pull-out test dynamic damage process numerical simulation embedment depth fracture performance
分类号:
TB333
DOI:
10.3724/SP.J.1249.2020.04381
文献标志码:
A
摘要:
利用RFPA2D-dynamics分析软件,引入Weibull统计分布函数,描述混凝土各相材料力学性能的非均匀性,建立双丝拉拔动态数值模拟模型,研究动荷载作用下埋深变化对双丝拉拔试件力学性能的影响. 从细观单元的弹性损伤本构关系出发,研究不同埋深试件从微裂纹萌生、扩展直至贯通的动态拉拔破坏过程,得到不同埋深试件荷载-位移曲线和声发射累积数曲线,探讨埋深变化对双丝拉拔试件力学性能的影响. 结果表明,在动载作用下,双丝埋深变化对试件破坏模式影响较大,大埋深试件出现了明显的振动回弹现象;随着埋深增加,双丝耦合效应增强,拔出过程需要消耗更多能量,试件的增强增韧效果显著.
Abstract:
Weibull statistical distribution function is introduced to establish dynamic numerical simulation model of twin fibers pull-out test with the software RFPA2D (realistic failure process analysis)-dynamics. The model is used to describe the non-uniformity of mechanical properties of concrete materials in different phases and study the influence of embedment depth on mechanical properties under dynamic load. According to the elastic damage constitutive relation of the meso-element, the dynamic tensile failure processes of specimens with various embedment depth are studied from micro-cracks initiation, propagation to crack penetration. The curves of load-displacement and acoustic emission cumulative number curves are also obtained. Influence of the embedment depth on properties of the twin fibers pull-out test specimens is scrutinized. The results show that variation of embedment depth of fibers has significant influence on the failure pattern of the specimen. Under dynamic loading, a phenomenon called ‘vibration springback’ appears obviously in specimens with larger embedment depth. In addition, with increasing embedment depth, the twin fibers coupling effect is enhanced and the pull-out process needs more energy, which leads remarkable higher strengthen and toughness.

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备注/Memo

备注/Memo:
Received:2020-04-20;Accepted:2020-05-14
Foundation:National Natural Science Foundation of China (51878190,51678170)
Corresponding author:Professor ZHANG Yafang.E-mail: zhangyafang2004@163.com
Citation:ZHANG Yafang,GUO Zhongxiang,LIU Hao,et al.Influence of embedment depth on dynamic failure property of twin fibers pull-out test[J]. Journal of Shenzhen University Science and Engineering, 2020, 37(4): 381-388.(in Chinese)
基金项目:国家自然科学基金资助项目(51878190,51678170)
作者简介:张亚芳(1966—),广州大学教授.研究方向:纤维增强混凝土细观力学性能.E-mail:zhangyafang2004@163.com
引文:张亚芳,郭中祥,刘浩,等.埋深对双丝拉拔试件动态破裂性能的影响[J]. 深圳大学学报理工版,2020,37(4):381-388.
更新日期/Last Update: 2020-07-26