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Analytical Bond-Slip Model for Fiber-Reinforced Cementitious Matrix-Concrete Joints Based on Strain Measurements

Zou, Xingxing / Sneed, Lesley H. / D’Antino, Tommaso / Carloni, Christian

An accurate bond-slip model is of fundamental importance to analyze the response of fiber-reinforced cementitious matrix (FRCM) composite-strengthened structures. This study proposes a method to determine the bond-slip model of FRCM-concrete joints based on longitudinal fiber strains. First, discrete strain profiles measured with strain gauges were fitted by a continuous function $ε (y)$ , where $y$ is the coordinate along the bonded length. Then the slip $s (y)$ and shear stress $τ$ ( $y$ ) along the composite bonded length were obtained by integration and derivation of $ε (y)$ , respectively. The debonding load and peak load from single-lap direct shear specimens were predicted by the fitted function $ε (y)$ and showed good agreement with test results. From the plot of the $τ (s)$ relationship obtained from $ε (y)$ , an alternative, closed-form, continuous bond-slip relationship was obtained based on the maximum shear stress $τ_{m}$ and the corresponding slip $s_{m}$ . The fracture energy was compared for both relationships and was in reasonable agreement with values reported in previous studies.

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Analytical Bond-Slip Model for Fiber-Reinforced Cementitious Matrix-Concrete Joints Based on Strain Measurements

Zou, Xingxing / Sneed, Lesley H. / D’Antino, Tommaso / Carloni, Christian

An accurate bond-slip model is of fundamental importance to analyze the response of fiber-reinforced cementitious matrix (FRCM) composite-strengthened structures. This study proposes a method to determine the bond-slip model of FRCM-concrete joints based on longitudinal fiber strains. First, discrete strain profiles measured with strain gauges were fitted by a continuous function $ε (y)$ , where $y$ is the coordinate along the bonded length. Then the slip $s (y)$ and shear stress $τ$ ( $y$ ) along the composite bonded length were obtained by integration and derivation of $ε (y)$ , respectively. The debonding load and peak load from single-lap direct shear specimens were predicted by the fitted function $ε (y)$ and showed good agreement with test results. From the plot of the $τ (s)$ relationship obtained from $ε (y)$ , an alternative, closed-form, continuous bond-slip relationship was obtained based on the maximum shear stress $τ_{m}$ and the corresponding slip $s_{m}$ . The fracture energy was compared for both relationships and was in reasonable agreement with values reported in previous studies.

Analytical Bond-Slip Model for Fiber-Reinforced Cementitious Matrix-Concrete Joints Based on Strain Measurements

Zou, Xingxing / Sneed, Lesley H. / D’Antino, Tommaso / Carloni, Christian

An accurate bond-slip model is of fundamental importance to analyze the response of fiber-reinforced cementitious matrix (FRCM) composite-strengthened structures. This study proposes a method to determine the bond-slip model of FRCM-concrete joints based on longitudinal fiber strains. First, discrete strain profiles measured with strain gauges were fitted by a continuous function $ε (y)$ , where $y$ is the coordinate along the bonded length. Then the slip $s (y)$ and shear stress $τ$ ( $y$ ) along the composite bonded length were obtained by integration and derivation of $ε (y)$ , respectively. The debonding load and peak load from single-lap direct shear specimens were predicted by the fitted function $ε (y)$ and showed good agreement with test results. From the plot of the $τ (s)$ relationship obtained from $ε (y)$ , an alternative, closed-form, continuous bond-slip relationship was obtained based on the maximum shear stress $τ_{m}$ and the corresponding slip $s_{m}$ . The fracture energy was compared for both relationships and was in reasonable agreement with values reported in previous studies.

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Title:

Analytical Bond-Slip Model for Fiber-Reinforced Cementitious Matrix-Concrete Joints Based on Strain Measurements

Contributors:

Zou, Xingxing (author) / Sneed, Lesley H. (author) / D’Antino, Tommaso (author) / Carloni, Christian (author)

Published in:

Journal of Materials in Civil Engineering ; 31

Publication date:

2019-08-16

ISSN:

0899-1561 , 1943-5533

DOI:

https://doi.org/10.1061/(ASCE)MT.1943-5533.0002855

Type of media:

Article (Journal)

Type of material:

Electronic Resource

Language:

Unknown

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