Dependence of fracture size effect and projectile penetration on fiber content of FRC

Bažant, Zdeněk P.; Rasoolinejad, Mohammad; Dönmez, Abdullah; Luo, Wen

doi:10.1088/1757-899x/596/1/012001

Cited by 7 publications

(2 citation statements)

References 22 publications

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“…Type I, or statistical size effect, is usual for simple concrete structures, is caused by stress redistribution, and occurs as a large crack propagates continuously from a small region containing micro-cracks. The location of this finite region will depend on the material's random resistance, i.e., this approach is energetic and statistical [13], [14].…”

Section: Size Effect Law (Sel)mentioning

confidence: 99%

Analysis of size effect in shear transfer mechanisms and size effect suppression by transversal reinforcement - contributions to NBR 6118

Ribeiro

Pessôa

Bittencourt

et al. 2023

Rev. IBRACON Estrut. Mater.

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Size effects are known to be relevant in the shear transfer mechanisms of quasi-brittle materials like concrete. Bažant proposed an asymptotic approximation between plasticity theory and Linear Elastic Fracture Mechanics (LEFM), showing a proportionality of concrete nominal resistance with d - 1 / 2, where d is beam depth. Recently, the long-standing shear transfer mechanism expressions of ACI 318:2014 have been updated (ACI 318:2019), with introduction of a size effect factor. In Brazil, recent publications identified non-conservative trends in predictions of ABNT NBR 6118:2014 for larger beam depths; yet, the Brazilian code never considered size effects because they are suppressed by transverse reinforcement. Considering this background, in this manuscript we make a comprehensive analysis of NBR 6118:2014 shear strength predictions using as a reference the papers of ACI-ASCE DatStb 445-D database. The results exhibit strong tendencies in the model error regarding longitudinal reinforcement and effective depth for beams without transversal reinforcement. A two-step analysis is made herein to describe model errors: first, a nonlinear regression for longitudinal reinforcement is made; second, a linear regression is made for size effect. The reliability analysis corroborates that model error may be reduced by introducing size effect and longitudinal reinforcement factors. Next, for beams with transversal reinforcement, smoother tendencies regarding beam depth are noted, indicating a size effect suppression for the beams depths available in the database. However, as the analysis shows that the higher beam depths concentrate most of the results with unconservative model errors, further studies are necessary to accurately describe how transversal reinforcement suppress the size effect.

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Section: Size Effect Law (Sel)mentioning

confidence: 99%

Analysis of size effect in shear transfer mechanisms and size effect suppression by transversal reinforcement - contributions to NBR 6118

Ribeiro

Pessôa

Bittencourt

et al. 2023

Rev. IBRACON Estrut. Mater.

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“…Previously, most of the fiber reinforcement research has been carried out to examine tensile strength [28,29], flexural strength [30][31][32] and drop-weight impact toughness [33][34][35][36]. Only some work dealt with the blast or impact resistance performance affected by fiber content and type [9,37,38], since the extreme loading tests are costly and even dangerous.…”

Section: Introductionmentioning

confidence: 99%

Blast-Resistant Performance of Hybrid Fiber-Reinforced Concrete (HFRC) Panels Subjected to Contact Detonation

et al. 2019

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This paper experimentally investigates the blast-resistant characteristics of hybrid fiber-reinforced concrete (HFRC) panels by contact detonation tests. The control specimen of plain concrete, polypropylene (PP), polyvinyl alcohol (PVA) and steel fiber-reinforced concrete were prepared and tested for characterization in contrast with PP-Steel HFRC and PVA-Steel HFRC. The sequent contact detonation tests were conducted with panel damage recorded and measured. Damaged HFRC panels were further comparatively analyzed whereby the blast-resistance performance was quantitively assessed via damage coefficient and blast-resistant coefficient. For both PP-Steel and PVA-Steel HFRC, the best blast-resistant performance was achieved at around 1.5% steel + 0.5% PP-fiber hybrid. Finally, the fiber-hybrid effect index was introduced to evaluate the hybrid effect on the explosion-resistance performance of HFRC panels. It revealed that neither PP-fiber or PVA-fiber provide positive hybrid effect on blast-resistant improvement of HFRC panels.

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Thick slab punching with symmetry reductions

Bocklenberg

Mark

2020

Structural Concrete

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The contribution presents a test series of four geometrically similar specimens of different size designed to investigate the punching behavior of thick reinforced concrete slabs. The thickness ranges from 300 to 650 mm and the slab radius varies between 1.12 and 2.45 m. For experimental execution, an innovative test method is employed and updated towards thick slabs. It uses the symmetry of specimens and reduces them corresponding to the symmetry grade to quarters. By applying this method, geometrical dimensions and associated test loads are reduced by 75%. The tests demonstrate on the one hand that the updated method is suitable for punching tests of thick specimens. And, on the other hand, the results indicate a less pronounced size effect for multilayered, highly reinforced slabs than predicted in theory.

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Dependence of fracture size effect and projectile penetration on fiber content of FRC

Cited by 7 publications

References 22 publications

Analysis of size effect in shear transfer mechanisms and size effect suppression by transversal reinforcement - contributions to NBR 6118

Analysis of size effect in shear transfer mechanisms and size effect suppression by transversal reinforcement - contributions to NBR 6118

Blast-Resistant Performance of Hybrid Fiber-Reinforced Concrete (HFRC) Panels Subjected to Contact Detonation

Thick slab punching with symmetry reductions

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