Comparisons between Numerical and Experimental Results for Fibre-Reinforced Polymer Strengthened Concrete Elements

2010 ◽  
Author(s):  
G. Mazzucco ◽  
V. Salomoni ◽  
C. Pellegrino ◽  
C. Majorana
Keyword(s):  
Experimental Results ◽  
Reinforced Polymer ◽  
Fibre Reinforced Polymer ◽  
Concrete Elements

scholarly journals Comparison of Analytical Approaches Predicting the Compressive Strength of Fibre Reinforced Polymers

Materials ◽  
2018 ◽  
Vol 11 (12) ◽  
pp. 2517 ◽  
Author(s):  
Christian Leopold ◽  
Sergej Harder ◽  
Timo Philipkowski ◽  
Wilfried Liebig ◽  
Bodo Fiedler
Keyword(s):  
Compressive Strength ◽  
Prediction Accuracy ◽  
Volume Fraction ◽  
Fibre Volume Fraction ◽  
Experimental Results ◽  
Analytical Models ◽  
Reinforced Polymers ◽  
Reinforced Polymer ◽  
Fibre Reinforced Polymer ◽  
Analytical Approaches

Common analytical models to predict the unidirectional compressive strength of fibre reinforced polymers are analysed in terms of their accuracy. Several tests were performed to determine parameters for the models and the compressive strength of carbon fibre reinforced polymer (CFRP) and glass fibre reinforced polymer (GFRP). The analytical models are validated for composites with glass and carbon fibres by using the same epoxy matrix system in order to examine whether different fibre types are taken into account. The variation in fibre diameter is smaller for CFRP. The experimental results show that CFRP has about 50% higher compressive strength than GFRP. The models exhibit significantly different results. In general, the analytical models are more precise for CFRP. Only one fibre kinking model’s prediction is in good agreement with the experimental results. This is in contrast to previous findings, where a combined modes model achieves the best prediction accuracy. However, in the original form, the combined modes model is not able to predict the compressive strength for GFRP and was adapted to address this issue. The fibre volume fraction is found to determine the dominating failure mechanisms under compression and thus has a high influence on the prediction accuracy of the various models.

scholarly journals Strengthening of Hollow Square Sections under Compression Using FRP Composites

2014 ◽  
Vol 2014 ◽  
pp. 1-19 ◽  
Author(s):  
M. C. Sundarraja ◽  
P. Sriram ◽  
G. Ganesh Prabhu
Keyword(s):  
Failure Modes ◽  
Deformation Behaviour ◽  
Three Dimensional ◽  
Local Buckling ◽  
Experimental Results ◽  
Frp Composites ◽  
Reinforced Polymer ◽  
Load Carrying ◽  
Carbon Fibre Reinforced Polymer ◽  
Fibre Reinforced Polymer

The feasibility study on carbon fibre reinforced polymer (CFRP) fabrics in axial strengthening of hollow square sections (HSS) was investigated in this paper. CFRP was used as strips form with other parameters such as the number of layers and spacing of strips. Experimental results revealed that the external bonding of normal modulus CFRP strips significantly enhanced the load carrying capacity and stiffness of the hollow sections and also reduced the axial shortening of columns by providing external confinement against the elastic deformation. The increase in the CFRP strips thickness effectively delayed the local buckling of the above members and led to the inward buckling rather than outward one. Finally, three-dimensional nonlinear finite element modeling of CFRP strengthened hollow square sectionswas created by using ANSYS 12.0 to validate the results and the numerical results such as failure modes and load deformation behaviour fairly agreed with the experimental results.

scholarly journals Experimental investigation on existing precast prc elements strengthened with cementitious composites

Alternativas ◽  
2017 ◽  
Vol 17 (3) ◽  
pp. 65-69
Author(s):  
Carlos Pellegrino ◽  
Giorgio Giacomin ◽  
Rafael Alberto Perlo
Keyword(s):  
Industrial Building ◽  
Experimental Investigations ◽  
Cementitious Composites ◽  
Design Code ◽  
Cementitious Matrix ◽  
Reinforced Polymer ◽  
Steel Bars ◽  
Fibre Reinforced Polymer ◽  
Concrete Elements ◽  
Real Scale

A number of experimental investigations on fibre reinforced polymer (FRP), with the aim of understanding their behaviour when applied as strengthening of reinforced concrete elements, are available in the literature but very few information is available on strengthening real-scale elements with cementitious composites. In particular design code formulations are scanty or non-existent.In this study the behaviour of four precast pre-stressed TT beams taken from an existing industrial building was investigated. One of them was considered as control unstrengthened TT beam, whereas the others were strengthened with different techniques, namely with FRP laminates (glued with epoxy resin), carbon fibres with cementitious matrix and steel fibres with cementitious matrix. Each material involved in this study was also mechanically characterized to obtain the main physical properties. Adequate specimens were obtained from the existing TT beam to characterize the concrete and the reinforcing steel bars.

scholarly journals EXPERIMENTAL AND ANALYTICAL INVESTIGATION OF THE EFFECT OF FIBRE REINFORCED POLYMER ON THE SHEAR STRENGTH OF REINFORCED CONCRETE BEAMS

2020 ◽  
Vol 4 (3) ◽  
pp. 60-71
Author(s):  
Nurudeen Yusuf ◽  
J. M. KAURA ◽  
A. Ocholi ◽  
M. Abbas ◽  
A. Mohammed
Keyword(s):  
Shear Strength ◽  
Carbon Fibre ◽  
Experimental Results ◽  
Rc Beams ◽  
Cfrp Laminate ◽  
Cfrp Laminates ◽  
Reinforced Polymer ◽  
Analytical Results ◽  
Carbon Fibre Reinforced Polymer ◽  
Fibre Reinforced Polymer

This paper presents the experimental and analytical results of the contribution of carbon fibre reinforced polymer (CFRP) laminates to the shear strength of RC beams. To assess the efficiency of the carbon fibre reinforced polymer (CFRP)  laminates on the strengthened specimens, twelve identical beams of cross-sectional dimensions 150x150x750mm were cast, out of which three are un-strengthened and nine were strengthened with U-wrap strips at 100 mm away from each support at varying CFRP laminates layers of  single, double and triple amounts. The prepared specimens were subjected to a three-point bending test. The results obtained revealed that the CFRP laminate increased the shear strength of the strengthened specimens over the control (un-strengthened) by 35.06%, 54.40% and 69.30% for single, double and triple layers of CFRP laminate respectively. The experimental results was also compared with the analytical results obtained based on the equation proposed by Khalifa et al., 1998. The analytical results obtained from the equation closely agreed with the experimental results. Therefore, it implies that the CFRP has the potentials of strengthening shear defiant RC beams.

Stress along tensile lap-spliced fibre reinforced polymer reinforcing bars in concrete

2007 ◽  
Vol 34 (9) ◽  
pp. 1149-1158 ◽  
Author(s):  
Ragi Aly
Keyword(s):  
Mathematical Model ◽  
Large Scale ◽  
Bond Stress ◽  
Experimental Results ◽  
Reinforcing Bars ◽  
Reinforced Polymer ◽  
Pullout Tests ◽  
Fibre Reinforced Polymer ◽  
Displacement Theory ◽  
Frp Bars

A theoretical study was carried out to investigate stress along tensile lap-spliced spaced or bundled fibre reinforced polymer (FRP) bars in concrete. R. Tepfers developed a mathematical model, which could be applied for any type of reinforcing bar, based on the modulus of displacement theory. The mathematical model can predict the bond stress and stresses in the reinforcing bars and the surrounding concrete. In this paper, the model developed by Tepfers was represented by applying the modulus of displacement theory, and theoretical predictions are compared with the experimental results from testing 16 large-scale concrete beams. Good agreement between the theoretical values and experimental results was observed at three stages of loading. Recommendations for investigating the modulus of displacement from pullout tests have been included. Lastly, the maximum average bond stress of spliced FRP bars can be estimated using the ultimate failure pattern analysis, in which the contributions of the splitting resistance were included.Key words: beams, fibre reinforced polymer (FRP) bars, bundled bars, concrete, tensile lap-splice, pullout tests, modulus of displacement, flexural tests.

Design for fire of concrete elements strengthened or reinforced with fibre-reinforced polymer: state of the art and opportunities from performance-based approaches

2013 ◽  
Vol 40 (11) ◽  
pp. 1034-1043 ◽  
Author(s):  
Luke Bisby ◽  
Tim Stratford
Keyword(s):  
Fire Resistance ◽  
Fire Safety ◽  
Elevated Temperatures ◽  
State Of The Art ◽  
The State ◽  
Structural Fire ◽  
Reinforced Polymer ◽  
Fibre Reinforced Polymer ◽  
Concrete Elements ◽  
Structural Fire Resistance

Recent years have seen widespread success applying fibre-reinforced polymer (FRP) materials for internal reinforcement and externally bonded strengthening of concrete structures. However, considerable reductions in mechanical and bond properties of FRP materials at elevated temperatures continue to hinder their application in buildings, where structural fire-resistance ratings are typically required. To meet currently imposed fire safety requirements, FRP materials often require supplemental fire protection insulation or thick concrete cover to maintain their temperature below an assumed (though not currently well-defined) “critical” value during an assumed standard fire exposure. Such requirements are based on a definition of structural fire resistance that is rooted in a prescriptive framework and that fails to take advantage of the state of the art in performance-based structural design for fire safety. This paper is intended to present a summary of the state of the art in this area and also to demonstrate clear opportunities for internal FRP reinforcement and external FRP strengthening of concrete elements that may arise from taking a performance-based fire safety design approach.

Modelling and testing of ageing of short fibre reinforced polymer composites

2011 ◽  
Vol 226 (1) ◽  
pp. 16-31 ◽  
Author(s):  
A Młyniec ◽  
T Uhl
Keyword(s):  
Polymer Composites ◽  
Young’S Modulus ◽  
Young's Modulus ◽  
Experimental Results ◽  
Short Fibre ◽  
Computation Method ◽  
Fibre Alignment ◽  
Reinforced Polymer ◽  
Temperature Ageing ◽  
Fibre Reinforced Polymer

A study in accelerated humidity–temperature ageing and it is numerical modelling for short fibre reinforced polymer composites (SFRPC) based on poly(butylene terephthalate) (PBT) is reported. Authors described experimental results of humidity–temperature ageing of PBT reinforced with glass fibres and proposed a novel computation method of strength and durability analysis for SFRPC parts. Experimental results showed different ageing behaviours, which depend on fibre alignment, e.g. a decrease of Young’s modulus in longitudinal fibre alignment in tension after ageing, an increase of Young’s modulus in transverse direction in tension after ageing, and the increase of the shear modulus and decrease of shear strength after ageing in both directions. Proposed modelling procedure takes the fibre orientation from mould filling analysis as an independent material orientation, using a developed ageing dependent material model, based on tensile, compressive, and shear properties for longitudinal and transverse fibre alignments, and calculates failure criteria as a function of the ageing time and fibre alignment. An innovative approach is to create a fibre alignment dependent material ageing model which takes into account changes of material properties depending on the direction of the reinforcement. This methodology was extended to arbitrary models and validated on real parts made of SFRPC.

scholarly journals DESIGN AND ANALYSIS OF COMPOSITE LEAF SPRING

2020 ◽  
Vol 15 (3) ◽  
Author(s):  
Prasanna Nagasai B ◽  
Srikanth S ◽  
Tarun D
Keyword(s):  
Experimental Results ◽  
Leaf Spring ◽  
Element Analysis ◽  
Reinforced Polymer ◽  
Light Commercial Vehicle ◽  
Glass Fibre Reinforced Polymer ◽  
Load Carrying ◽  
Fibre Reinforced Polymer ◽  
Glass Fibre Reinforced ◽  
D Model

This paper describes the design and experimental analysis of composite leaf spring made of glass fibre reinforced polymer. The main aim is to compare the load-carrying capacity, stiffness and weight savings of composite leaf spring with that of steel leaf spring. The design constraints are stress and deflection. The dimensions of an existing conventional steel leaf spring of a light commercial vehicle were considered for the present work. A traditional composite multi-leaf spring was fabricated with the same dimensions using E- Glass/Epoxy unidirectional laminates. Static analysis of 2D model of conventional leaf spring has also been performed using ANSYS 10 and compared with experimental results. Finite element analysis with a full load on the 3-D model of composite multileaf spring was performed using ANSYS, and the analytical results were compared with experimental results

scholarly journals Fibre-reinforced polymer stirrup for reinforcing concrete structures

2020 ◽  
Vol 3 (1) ◽  
pp. 17-24
Author(s):  
Marco Lindner ◽  
Konrad Vanselow ◽  
Sandra Gelbrich ◽  
Lothar Kroll
Keyword(s):  
Fibre Composite ◽  
Precast Concrete ◽  
Load Carrying Capacity ◽  
Lightweight Construction ◽  
Reinforced Polymer ◽  
Load Carrying ◽  
Fibre Reinforced Polymer ◽  
International Testing ◽  
Concrete Elements ◽  
Interesting Alternative

Fibre-plastic composites offer an interesting alternative to concrete reinforcement. In order to expandthe application spectrum of reinforcing elements in fibre composite construction, a new steel-free bracingsystem with reduced radii of curvature was developed. An improvement in load carrying capacity couldbe proven in extensive investigations based on international testing methods and verified by practicaltests. With the help of newly reinforced precast concrete elements from the area of waterways and trafficroutes, a high potential for lightweight construction and resource efficiency can be impressivelydemonstrated.

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