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Chapter 7. Cracked hinge numerical model for fiber-reinforced concrete(dowel parameter) and c 1 = 0.15 (coefficient of beam foundation). The assumed valuesfor the orientation factors αN ⃗ are based on the theoretical proposal outlined by Dupontand Vandewalle [2005] and briefly reported in section 7.1. Particularly, the values 0.57and 0.54 are determined for long and short fibers, respectively. vertical load kN 353025201510S75Numerical predictionsρ f 1.0ρ f 0.5500 1 2 3 4 5 6CTODm mmFigure 7.8: Load-C T ODm numerical predictions against the experimental data on SFRCS75-type by Caggiano et al. [2012a]. 35S100vertical load kN 30252015105Numerical predictions ρ f 1.0ρ f 0.5 00 1 2 3 4 5 6CTODm mmFigure 7.9: Load-C T ODm numerical predictions against the experimental data on SFRCS100-type by Caggiano et al. [2012a].The numerical force-C T ODm curves, against the corresponding experimental results,are proposed from Figure 7.5 to 7.9. C T ODm represents the mean of the two oppositeCrack Tip Opening Displacements (C T ODs) registered by the transductor devices of150
7.5. Closing remarksthe experimental campaign (to see Chapter 2). The load-crack opening responses ofSFRC beams emphasize the significant influence of the fiber reinforcement on thepeak strength and the post-peak behavior. Fiber bridging effects on the pre-crackedconcretes are well simulated by the considered numerical approach with the proposednon-linear separation law for SFRC.The results of these numerical analyses demonstrate that the model leads to accuratesimulations of the SFRC performance in terms of both peak strength and post-peakductility of failure processes under mode I type of fracture, when different fiber typesand contents are considered.7.5 Closing remarksThe four-point bending behavior of notched SFRC beams has numerically been investigatedand compared against experimental results on four-point bending tests. Twodifferent amounts of steel fibers are considered and modeled at a numerical standpoint.A novel stress-crack opening model, based on a hinge-crack approach alreadyavailable in the scientific literature, has been employed to reproduce and simulate theexperimental results proposed in an other chapter of this thesis. As for the interfaceformulation, originally employed for meso-mechanical analyses as proposed in Chapter6, the model has been based on the explicit modeling of the interaction betweenconcrete and steel fibers. The numerical predictions, compared with the experimentalmeasures, demonstrate the soundness and capability of the model to reproduce themechanical response of SFRC components.151
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Dottorato di Ricercain Ingegneria d
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AcknowledgementsI would like to exp
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Abstractinclusion of fibers and the
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ContentsAcknowledgementsAbstractTab
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Contents8.6.1 Tensile tests . . . .
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List of Figures2.1 Fine and coarse
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List of Figures4.16 Pull-out simula
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List of Figures6.14 Crack paths of
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List of Tables2.1 Mix design per cu
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Chapter 1. Introduction1.1.1 Fiber
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Chapter 1. Introductionthe fiber ad
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Chapter 1. Introductionand mechanic
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Chapter 1. Introduction[Vrech and E
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Chapter 1. IntroductionDespite the
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Chapter 1. Introduction(Figure 1.4)
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Chapter 1. IntroductionFigure 1.8:
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Chapter 1. Introductionfor structur
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Chapter 1. Introductioncracking beh
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Chapter 1. Introduction• "c" if 0
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Chapter 1. Introductionsumed due to
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Chapter 1. Introductionaleatoric na
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Chapter 1. IntroductionFigure 1.13:
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Chapter 1. IntroductionElement Meth
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Chapter 2. Experimental characteriz
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Chapter 3. Zero-thickness interface
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4 Bond behavior of fibers in cement
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4.2. Bond behavior of fibers in con
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4.3. Elasto-plastic joint/interface
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4.4. Fracture energy-based interfac
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4.4. Fracture energy-based interfac
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4.5. Numerical results and experime
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4.6. Closing remarksMPa3.02.5Pi N2.
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5 Model performance and numericalpr
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5.1. Numerical analysesones mention
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5.1. Numerical analysesshown in Fig
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Page 167 and 168: 7 Cracked hinge numerical modelfor
Page 169 and 170: 7.1. Basic assumptionsSection at no
Page 171 and 172: 7.1. Basic assumptions1997, Stankow
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Page 175: 7.4. Numerical predictionsvertical
Page 180 and 181: Chapter 8. Elasto-plastic microplan
Page 200 and 201: Chapter 9. Conclusionsof first-crac
Page 202 and 203: Chapter 9. Conclusionsfibers in con
Page 204 and 205: Chapter 9. Conclusions9.6 Future re
Page 206 and 207: BibliographyN. Banthia and N. Nanda
Page 208 and 209: BibliographyM. Butler, V. Mechtcher
Page 210 and 211: BibliographyCUR. Bepaling van de Bu
Page 212 and 213: BibliographyEN-12390-3. Testing of
Page 214 and 215: BibliographyT. Guttema. Ein Beitrag
Page 216 and 217: BibliographyE. Kuhl, P. Steinmann,
Page 218 and 219: BibliographyO. Manzoli, J. Oliver,
Page 220 and 221: BibliographyK. Park, G. Paulino, an
Page 222 and 223: BibliographyI. Singh, B. Mishra, an
Page 224: BibliographyG. Wells and L. Sluys.
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