Failure Analysis of Ultra High-Performance Fiber-Reinforced Concrete Structures Enhanced with Nanomaterials by Using a Diffuse Cohesive Interface Approach
Recent progresses in nanotechnology have clearly shown that the incorporation of nanomaterials within concrete elements leads to a sensible increase in strength and toughness, especially if used in combination with randomly distributed short fiber reinforcements, as for ultra high-performance fiber-...
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doaj-560224b77b364382a0436068cb6d27ed2020-11-25T03:43:31ZengMDPI AGNanomaterials2079-49912020-09-01101792179210.3390/nano10091792Failure Analysis of Ultra High-Performance Fiber-Reinforced Concrete Structures Enhanced with Nanomaterials by Using a Diffuse Cohesive Interface ApproachUmberto De Maio0Nicholas Fantuzzi1Fabrizio Greco2Lorenzo Leonetti3Andrea Pranno4Department of Civil Engineering, University of Calabria, 87036 Rende, ItalyDepartment of Civil, Chemical, Environmental and Materials Engineering, University of Bologna, 40136 Bologna, ItalyDepartment of Civil Engineering, University of Calabria, 87036 Rende, ItalyDepartment of Civil Engineering, University of Calabria, 87036 Rende, ItalyDepartment of Civil Engineering, University of Calabria, 87036 Rende, ItalyRecent progresses in nanotechnology have clearly shown that the incorporation of nanomaterials within concrete elements leads to a sensible increase in strength and toughness, especially if used in combination with randomly distributed short fiber reinforcements, as for ultra high-performance fiber-reinforced concrete (UHPFRC). Current damage models often are not able to accurately predict the development of diffuse micro/macro-crack patterns which are typical for such concrete structures. In this work, a diffuse cohesive interface approach is proposed to predict the structural response of UHPFRC structures enhanced with embedded nanomaterials. According to this approach, all the internal mesh boundaries are regarded as potential crack segments, modeled as cohesive interfaces equipped with a mixed-mode traction-separation law suitably calibrated to account for the toughening effect of nano-reinforcements. The proposed fracture model has been firstly validated by comparing the failure simulation results of UHPFRC specimens containing different fractions of graphite nanoplatelets with the available experimental data. Subsequently, such a model, combined with an embedded truss model to simulate the concrete/steel rebars interaction, has been used for predicting the load-carrying capacity of steel bar-reinforced UHPFRC elements enhanced with nanoplatelets. The numerical outcomes have shown the reliability of the proposed model, also highlighting the role of the nano-reinforcement in the crack width control.https://www.mdpi.com/2079-4991/10/9/1792ultra high-performance fiber-reinforced concrete (UHPFRC)nanomaterialsdiffuse cohesive interface modelsnonlinear finite element analysismultiple crack propagation |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Umberto De Maio Nicholas Fantuzzi Fabrizio Greco Lorenzo Leonetti Andrea Pranno |
spellingShingle |
Umberto De Maio Nicholas Fantuzzi Fabrizio Greco Lorenzo Leonetti Andrea Pranno Failure Analysis of Ultra High-Performance Fiber-Reinforced Concrete Structures Enhanced with Nanomaterials by Using a Diffuse Cohesive Interface Approach Nanomaterials ultra high-performance fiber-reinforced concrete (UHPFRC) nanomaterials diffuse cohesive interface models nonlinear finite element analysis multiple crack propagation |
author_facet |
Umberto De Maio Nicholas Fantuzzi Fabrizio Greco Lorenzo Leonetti Andrea Pranno |
author_sort |
Umberto De Maio |
title |
Failure Analysis of Ultra High-Performance Fiber-Reinforced Concrete Structures Enhanced with Nanomaterials by Using a Diffuse Cohesive Interface Approach |
title_short |
Failure Analysis of Ultra High-Performance Fiber-Reinforced Concrete Structures Enhanced with Nanomaterials by Using a Diffuse Cohesive Interface Approach |
title_full |
Failure Analysis of Ultra High-Performance Fiber-Reinforced Concrete Structures Enhanced with Nanomaterials by Using a Diffuse Cohesive Interface Approach |
title_fullStr |
Failure Analysis of Ultra High-Performance Fiber-Reinforced Concrete Structures Enhanced with Nanomaterials by Using a Diffuse Cohesive Interface Approach |
title_full_unstemmed |
Failure Analysis of Ultra High-Performance Fiber-Reinforced Concrete Structures Enhanced with Nanomaterials by Using a Diffuse Cohesive Interface Approach |
title_sort |
failure analysis of ultra high-performance fiber-reinforced concrete structures enhanced with nanomaterials by using a diffuse cohesive interface approach |
publisher |
MDPI AG |
series |
Nanomaterials |
issn |
2079-4991 |
publishDate |
2020-09-01 |
description |
Recent progresses in nanotechnology have clearly shown that the incorporation of nanomaterials within concrete elements leads to a sensible increase in strength and toughness, especially if used in combination with randomly distributed short fiber reinforcements, as for ultra high-performance fiber-reinforced concrete (UHPFRC). Current damage models often are not able to accurately predict the development of diffuse micro/macro-crack patterns which are typical for such concrete structures. In this work, a diffuse cohesive interface approach is proposed to predict the structural response of UHPFRC structures enhanced with embedded nanomaterials. According to this approach, all the internal mesh boundaries are regarded as potential crack segments, modeled as cohesive interfaces equipped with a mixed-mode traction-separation law suitably calibrated to account for the toughening effect of nano-reinforcements. The proposed fracture model has been firstly validated by comparing the failure simulation results of UHPFRC specimens containing different fractions of graphite nanoplatelets with the available experimental data. Subsequently, such a model, combined with an embedded truss model to simulate the concrete/steel rebars interaction, has been used for predicting the load-carrying capacity of steel bar-reinforced UHPFRC elements enhanced with nanoplatelets. The numerical outcomes have shown the reliability of the proposed model, also highlighting the role of the nano-reinforcement in the crack width control. |
topic |
ultra high-performance fiber-reinforced concrete (UHPFRC) nanomaterials diffuse cohesive interface models nonlinear finite element analysis multiple crack propagation |
url |
https://www.mdpi.com/2079-4991/10/9/1792 |
work_keys_str_mv |
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