DOI: 10.3724/SP.J.1249.2018.05453

Journal of Shenzhen University Science and Engineering (深圳大学学报理工版) 2018/35:5 PP.453-459

Influence of spacing on twin fibers pull-out test of concrete matrix under dynamic load

In order to study the laws of dynamic failure of fiber reinforced concrete under interface control, we investigate the influence of fiber spacing on failure pattern and mechanical properties of twin fibers pull-out specimens under dynamic loading. Based on the linear finite element method and the elastic statistical damage theory of RFPA2D-Dynamics numerical analysis software, a dynamic numerical model of twin fibers pull-out test of is established by introducing Weibull distribution to consider the material heterogeneity of concrete. We simulate the whole process from micro-cracks initiation, propagation to crack penetration from the viewpoint of mesomechanics. We obtain the interfacial shear stress distribution curves, load-displacement curves and peak load-twin fiber spacing-relative toughness curves and other curves to investigate the failure modes, interfacial mechanical performance, strengthening and toughening mechanism of twin fibers pull-out of concrete matrix under dynamic loading. Results show that fiber spacing has great effect on failure pattern of specimens. Furthermore, both peak load and relative toughness show a tendency of increasing first and then decreasing along with increase of the twin fiber spacing.

Key words:concrete,dynamic load,twin fibers pull-out test,fiber spacing,heterogeneity,numerical simulation

ReleaseDate:2018-12-14 06:52:38

[1] 张亚芳,高照,刘浩,等.界面厚度对双丝拉拔混凝土力学性能的影响[J].深圳大学学报理工版,2017,34(5):476-481. ZHANG Yafang,GAO Zhao,LIU Hao,et al.Influence of interface thickness on twin fiber pull-out test of concrete[J].Journal of Shenzhen University Science and Engineering,2017,34(5):476-481.(in Chinese)

[2] 李建,唐朝生,王德银,等.基于单根纤维拉拔试验的波形纤维加筋土界面强度研究[J].岩土工程学报,2014,36(9):1696-1704. LI Jian,TANG Chaosheng,WANG Deyin,et al.Single fiber pullout tests on interfacial shear strength of wave-shape fiber-reinforced soils[J].Chinese Journal of Geotechnical Engineering,2014,36(9):1696-1704.(in Chinese)

[3] MAIDA P D,RADI E,SCIANCALEPORE C,et al.Pullout behavior of polypropylene macro-synthetic fibers treated with nano-silica[J].Construction & Building Materials,2015,82:39-44.

[4] 徐松林,唐志平,戴翔宇,等.非直纤维的细观动态拔出模型分析[J].复合材料学报,2004,21(1):109-113. XU Songlin,TANG Zhiping,DAI Xiangyu,et al.Dynamic meso-scale model of the pullout behavior for a non-staight fiber[J].Acta Materiae Compositae Sinica,2004,21(1):109-113.(in Chinese)

[5] TAI Y S,El-TAWIL S,CHUNG T H.Performance of deformed steel fibers embedded in ultra-high performance concrete subjected to various pullout rates[J].Cement & Concrete Research,2016,89:1-13.

[6] TAI Y S,El-TAWIL S.High loading-rate pullout behavior of inclined deformed steel fibers embedded in ultra-high performance concrete[J].Construction & Building Materials,2017,148:204-218.

[7] SAMEER H,TAHER A L, BRIAN Z.Rate Effect on pullout behavior of steel fibers embedded in very-high strength concrete[J].American Journal of Engineering & Applied Sciences,2010,3(2):454-463.

[8] 曾向荣.间距和埋深对双丝拉拔过程影响的细观力学研究[D].广州:广州大学,2016. ZENG Xiangrong.Meso-mechanics influence on spacing and embedded length of twin fibers pullout test[D].Guangzhou:Guangzhou University,2016.(in chinese)

[9] 贾敬辉,张永彬.动荷载作用下三点弯曲梁的破坏形式与偏置裂纹位置的关系[J]].武汉理工大学学报, 2012,34(11):84-87. JIA Jinhui,ZHANG Yongbin.Relations between the location of the notch and the failure mode in three-point bending beam under the dynamic loads[J]. Journal of WuhanUniversity of Technology.2012,34(11):84-87.(in Chinese)

[10] 李超,刘红岩, 阎锡东.动载下节理岩体破坏过程的数值试验研究[J].岩土力学,2015,36(s2):655-664. LI Chao,LIU Hongyan,YAN Xidong.Numerical experiment of failure process of jointed rock mass under dynamic loading[J].Rock and Soil Mechanics,2015,36(s2):655-664.(in Chinese)

[11] 唐春安,朱万成.混凝土损伤与断裂:数值试验[M].北京:科学出版社,2003. TANG Chun'an,ZHU Wancheng.Concrete damage and fracture:numerical tests[M].Beijing:Science Press,2003.(in Chinese)

[12] 张永彬,梁正召,贾敬辉,等.应力波作用下三点弯曲梁破坏过程数值模拟[J].地下空间与工程学报, 2013, 9(5):1006-1010. ZHANG Yongbin,LIANG Zhengzhao,JIA Jinghui,et al.Numerical simulation of failure process of three-point bending beam under impact[J].Chinese Journal of Underground Space and Engineering,2013,9(5):1006-1010.(in Chinese)

[13] 胡在良,张佰战.高性能混凝土桩的应力波波速试验研究[J].土木工程与管理学报,2011,28(1):59-63. HU Zailiang,ZHANG Baizhan.Experimental research on stress wave velocities of high performance concrete pile[J].Journal of Civil Engineering and Management, 2011,28(1):59-63.(in Chinese)

[14] LEUNG C K Y,LI V C.New strength-based model for the debonding of discontinuous fibres in an elastic matrix[J].Journal of Materials Science,1991,26(22):5996-6010.

[15] 黄俊,姜弘道.一种新的界面脱黏和纤维拔出模型[J].应用力学学报,2006,23(3):473-478. HUANG Jun,JIANG Hongdao. New model of interfacial debonding and fiber pullout[J].Chinese Journal of Applied Mechanics,2006,23(3):473-478.(in Chinese)

[16] 张亚芳,曾向荣,刘浩,等.界面控制下间距对双丝拉拔实验影响的数值模拟研究[J].武汉理工大学学报,2015,37(9):78-83. ZHANG Yafang,ZENG Xiangrong,LIU Hao,et al.Numerical simulation on twin fibers pull-out test under interfacial control with effect of spacing[J].Journal of WuhanUniversity of Technology,2015,37(9):78-83.(in Chinese)

[17] 赵燕茹,邢永明, 雷振坤,等.力、热载荷作用下纤维在复合材料中的界面应力传递行为[J].复合材料学报,2008,25(4):187-192. ZHAO Yanru,XIN Yongming,LEI Zhenkun,et al.Interfacial stress transfer behavior of single-fiber composite under the effect of mechanical and thermal loading[J].Acta Materiae Compositae Sinica,2008, 25(4):187-192.(in Chinese)

[18] SUN W,MANDEL J A,SAID S.Study of the interface strength in steel fiber-reinforced cement-based composites[J].Journal of the American Concrete Institute,1986,83(4):597-605.

[19] 孙伟, MANDEL J A.纤维间距对界面层的影响[J].硅酸盐学报,1989(3):76-81. SUN Wei,MANDEL J A.Effects of fiber spacing on interfacial layers[J].Journal of the Chinese Ceramic Society,1989(3):76-81.(in Chinese)

[20] 黄承逵. 纤维混凝土结构[M]. 北京:机械工业出版社,2004. HUANG Chengkui.Fiber reinforced concrete structure[M].Beijing:Machinery Industry Press, 2004.(in Chinese)