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Polymers 2018, 10(4)
Flexible Adhesive in Composite-to-Brick Strengthening - Experimental and Numerical Study
Arkadiusz Kwiecień, Piotr Krajewski, Łukasz Hojdys, Marcin Tekieli, Marek Słoński

This paper investigates composite-to-brick strengthening systems with flexible adhesive made of polyurethane (Carbon Fibre Reinforced Polyurethane (CFRPU) and Steel Reinforced Polyurethane (SRPU)) and epoxy resin (Carbon Fibre Reinforced Polymer (CFRP) and Steel Reinforced Polymer (SRP). The specimens were tested in a single lap shear test (SLST). LVDT displacement transducers (LVDT – Linear Variable Differential Transformer) and digital image correlation method (DIC) based measurement systems were used to measure displacements and strains. The obtained results were applied in a numerical analysis of the 3D model of the SLST specimen, with flexible adhesives modeled as a hyper-elastic model. The DIC and LVDT based systems demonstrated a good correlation. Experimental and numerical analysis confirmed that composite-to-brick strengthening systems with flexible adhesives are more effective on brittle substrates than stiff ones, as they are able to reduce stress concentrations and more evenly distribute stress along the entire bonded length, thus having a higher load carrying capacity.

Słowa kluczowe: strengthening; masonry; CFRP; CFRPU; SRP; SRPU; flexible adhesives; experimental tests; DIC measurements; shear bond tests; numerical analysis

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Engineering Transactions, 65, 1, pp. 113–121, 2017
Validation of a New Hyperviscoelastic Model for Deformable Polymers Used for Joints between RC Frames and Masonry Infills
Arkadiusz Kwiecień, Matija Gams, Theodoros C. Rousakis, Alberto Viskovic, Jozef Korelc

In the paper, an attempt to alleviate the problem of premature damage to infills by using flexible polymers between the infill and the r.c. frame is presented. The flexibility of the polymer could serve to reduce the stress concentrations and thereby reduce damage to infills on one hand, and provide a high amount of damping and ductility on the other. Its efficiency is tested by cyclic shear tests carried out on a large-scale model. In the numerical part, the material is modelled using for the purpose developed finite element. The finite element with the new hyperviscoelastic constitutive model was coded in the AceGen/AceFEM program.

Słowa kluczowe: deformable polymers; hyperviscoelastic model; masonry infills

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