doi:

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


Abstract:
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



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