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Analytical and numerical modeling of composite-to-brick bond

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Abstract

In masonry components strengthened with externally bonded composites, good bonding is one of the most important aspects governing structural behavior, since failure usually takes place with detachment between reinforcement and substrate. This type of event is a brittle, sudden and therefore undesirable failure mechanism; nor does it allow the full strength of the reinforcement to be exploited. Many experimental data on bonding have recently become available from a Round Robin Test carried out within the framework of RILEM TC-223. In the present paper, experimental tests were simulated at increasing levels of complexity; bond behavior was first studied with an analytical model based on bi-linear representation of bond law. Two-dimensional and three-dimensional finite element analyses were then performed, according to various bond-slip laws. In particular, a number of bi-linear and non-linear interface laws were used, calibrated according to several strategies but with the same experimental population. Lastly, several commercial codes and types of finite elements were examined. This work may be said to represent a numerical Round Robin Test, with various simulations and modeling approaches. Analytical and numerical results are compared with experimental ones, in terms of both overall behavior (load to displacement curve) and local behavior (strain profiles on reinforcements at increasing load values), showing the importance of both types of information in order to obtain reliable predictions of experimental results.

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Abbreviations

bm :

Brick width

tm :

Brick thickness

bf :

Strip width

tf :

Strip thickness

Af :

Cross-section of reinforcement strip

Em :

Young’s modulus of brick

fbm :

Brick compressive strength

Ef :

Young’s modulus of strip

τ0 :

Bond shear strength

s0 :

Slip at peak of bond stress

su :

Ultimate slip

ΓFd :

Specific fracture energy

K:

Slope of ascending branch of bond stress-slip law

FC:

Confidence factor (assumed to be 1)

kb :

Geometric coefficient

kG :

Material substrate coefficient

α:

Exponent of pre-peak branch of bond stress-slip law

α′:

Exponent of post-peak branch of bond stress-slip law

n :

Coefficient of bond stress-slip law

Pmax :

Debonding load

P0 :

Load at end of elastic behavior

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Authors and Affiliations

  1. University of Sannio, Benevento, Italy

    F. Ceroni

  2. University Roma Tre, Rome, Italy

    G. de Felice & M. Malena

  3. University of Cassino and Southern Lazio, Cassino, Italy

    E. Grande & E. Sacco

  4. University of Bologna, Bologna, Italy

    C. Mazzotti & F. Murgo

  5. University of Padova, Padua, Italy

    M. R. Valluzzi

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  1. F. Ceroni
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  2. G. de Felice
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  8. M. R. Valluzzi
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Correspondence to F. Ceroni.

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Ceroni, F., de Felice, G., Grande, E. et al. Analytical and numerical modeling of composite-to-brick bond. Mater Struct 47, 1987–2003 (2014). https://doi.org/10.1617/s11527-014-0382-8

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  • DOI: https://doi.org/10.1617/s11527-014-0382-8

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