Mechanics of fibre-reinforced polymer - concrete interfaces

2007 ◽  
Vol 34 (3) ◽  
pp. 367-377 ◽  
Author(s):  
U A Ebead ◽  
K W Neale
Keyword(s):  
Finite Element ◽  
Load Capacity ◽  
Concrete Block ◽  
Polymer Concrete ◽  
Element Analysis ◽  
Interface Elements ◽  
Frp Composite ◽  
Reinforced Polymer ◽  
Interfacial Behaviour ◽  
Fibre Reinforced Polymer

A finite element model is developed for analyzing the interfacial behaviour for fibre-reinforced polymer (FRP) laminates externally bonded to concrete prisms and subjected to direct shear. The element sizes of the FRP, adhesive, and concrete at the interface were chosen to be very small (0.25–0.5 mm) so that the debonding behaviour could be properly captured. The behaviour at the interface between the FRP composite and the concrete is modelled using truss elements connecting the FRP laminate to the concrete block. The truss elements incorporate a nonlinear bond stress-slip relationship controlled by several parameters related to the characteristics of the FRP composite, adhesive, and concrete. Results are given in terms of the load capacity of the joint and the stress and strain distributions in the FRP, at the interface, and in the concrete. In addition, the transfer lengths, as well as the force transfer between the FRP laminate and the concrete block, are investigated. Comparisons between the finite element results and available experimental data are presented.Key words: nonlinear finite element analysis, FRP-to-concrete bonded joints, interface elements, debonding, interfacial behaviour, transfer lengths.

Finite element analysis of an inelastic interface in ultrasonic welded metal/fibre-reinforced polymer joints

2010 ◽  
Vol 50 (1) ◽  
pp. 184-190 ◽  
Author(s):  
N. Konchakova ◽  
F. Balle ◽  
F.J. Barth ◽  
R. Mueller ◽  
D. Eifler ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Element Analysis ◽  
Reinforced Polymer ◽  
Fibre Reinforced Polymer ◽  
Metal Fibre

Fibre reinforced polymer reinforcing bars for bridge decks

2000 ◽  
Vol 27 (5) ◽  
pp. 839-849 ◽  
Author(s):  
T Hassan ◽  
A Abdelrahman ◽  
G Tadros ◽  
S Rizkalla
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Nonlinear Finite Element Analysis ◽  
Nonlinear Finite Element ◽  
Wheel Load ◽  
Element Analysis ◽  
Concentrated Load ◽  
Reinforced Polymer ◽  
Fibre Reinforced Polymer ◽  
Frp Reinforcement

This paper describes the behaviour of two full-scale models of a portion of highway bridge slab reinforced with fibre reinforced polymer (FRP) reinforcement. The first slab was reinforced totally with carbon FRP (CFRP), and the second slab was reinforced with hybrid glass FRP (GFRP) and steel reinforcement. The models were tested under static loading up to failure using a concentrated load acting on each span of the continuous slab and the two cantilevers to simulate the effect of a truck wheel load. Load-deflection behaviour, crack patterns, strain distribution, and failure mode are reported. The measured values are compared to values calculated using nonlinear finite element analysis model. The accuracy of the nonlinear finite element analysis is demonstrated using independent test results conducted by others. The analytical model is used to examine the influence of various parameters, including the type of reinforcement, boundary conditions, and reinforcement ratio. Based on serviceability and ultimate capacity requirements, reinforcement ratios for using CFRP and GFRP reinforcement for typical bridge deck slabs are recommended.Key words: bridges, deflection, FRP, reinforcement, concrete, punching, slabs, shear, finite element model, strain.

Finite element modeling of concrete structures reinforced with internal and external fibre-reinforced polymers

2007 ◽  
Vol 34 (3) ◽  
pp. 340-354 ◽  
Author(s):  
Ali Nour ◽  
Bruno Massicotte ◽  
Emre Yildiz ◽  
Viacheslav Koval
Keyword(s):  
Finite Element ◽  
Constitutive Model ◽  
Concrete Structures ◽  
Constitutive Law ◽  
Nonlinear Behaviour ◽  
Element Analysis ◽  
Finite Element Software ◽  
Reinforced Polymer ◽  
Fibre Reinforced Polymer ◽  
Concrete Model

Externally bonded fibre-reinforced-polymer (FRP) laminates and fabrics have been successfully used for strengthening damaged or deficient concrete members, whereas internal FRP reinforcements are becoming an efficient alternative to steel reinforcement, particularly in corrosive environments. Despite the enormous progress that has been observed in the last decade, further research is still required to consolidate recent developments and expand the scope of application of FRPs for structural uses. Nonlinear finite element analysis combined with laboratory testing constitutes an efficient approach for pursuing this objective. The scope of this paper is to illustrate, through a selection of a wide variety of typical applications, the contribution of a refined three-dimensional (3-D) constitutive model for investigating the nonlinear response of concrete structures reinforced with internal and external FRPs. The analyses are carried out using a general and portable constitutive concrete model implemented as a user-defined subroutine at Gauss integration point level in commercial finite element software. The constitutive law follows a 3-D hypoelastic approach that models the nonlinear behaviour of concrete using a scalar damage parameter that accounts for the anisotropic behaviour of partially confined concrete and the inelastic volume expansion upon reaching the peak strength. In tension, the model adopts a macroscopic approach that is directly integrated into the concrete law. It simulates implicitly the reinforcing bar – concrete interaction using tension-stiffening factors modified according to the nature of reinforcement that vary as a function of the member strain. The applications include results of well-known test series published in the literature on beams with external and internal FRP reinforcement, slabs with internal reinforcements, bond failure analysis of external FRP, and the effect of confinement on the behaviour in compression of circular and square elements. The paper demonstrates the ability of the concrete model to correctly simulate the behaviour of structural elements reinforced with FRPs at service load level and reproduce failure mechanisms and loads that are consistent with the experimental observations.Key words: constitutive model, nonlinear analysis, finite element, reinforced concrete, glass-fibre-reinforced polymer (GFRP), carbon-fibre-reinforced polymer (CFRP), strengthening, steel.

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