Design code development for fibre-reinforced polymer structures and repairs

2002 ◽  
Vol 4 (2) ◽  
pp. 149-160 ◽  
Author(s):  
Atsuhiko Machida ◽  
Kyuichi Maruyama
Keyword(s):  
Design Code ◽  
Reinforced Polymer ◽  
Fibre Reinforced Polymer ◽  
Code Development

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.

Field study of glass-fibre-reinforced polymer durability in concrete

2007 ◽  
Vol 34 (3) ◽  
pp. 355-366 ◽  
Author(s):  
A A Mufti ◽  
M Onofrei ◽  
B Benmokrane ◽  
N Banthia ◽  
M Boulfiza ◽  
...  
Keyword(s):  
Glass Fibre ◽  
Maximum Stress ◽  
Limit State ◽  
Extensive Study ◽  
Primary Reinforcement ◽  
Design Code ◽  
Reinforced Polymer ◽  
Glass Fibre Reinforced Polymer ◽  
Fibre Reinforced Polymer ◽  
Glass Fibre Reinforced

The Canadian Highway Bridge Design Code (CHBDC) does not permit the use of glass-fibre-reinforced polymer (GFRP) for primary reinforcement or prestressing tendons in concrete components. The restriction on the use of GFRP in concrete was based on published laboratory studies indicating that GFRP is not stable in the alkaline environment of concrete. In 2004, ISIS Canada sponsored an extensive study of the durability of GFRP in concrete by removing cores from GFRP-reinforced concrete components of five 5- to 8-year-old structures from across Canada. Three teams working independently at several Canadian universities used a variety of analytical methods to (i) investigate whether the GFRP in concrete field structures had been attacked by alkalis and (ii) compare the composition of GFRP removed from in-service structures with the composition of control specimens that were saved from the projects and not exposed to the concrete environment. The analytical results have confirmed that the GFRP in concrete did not suffer any damage during the 5–8 years of exposure. As a result of this study, the CHBDC in its forthcoming (second) edition has permitted the use of GFRP for both primary reinforcement and prestressing tendons in concrete components, provided the maximum stress level in GFRP at the serviceability limit state is kept at or below 25% of its ultimate strength. It was also found that, contrary to some claims, concrete over GFRP bars does not crack even if the depth of cover is as thin as 28 mm.Key words: alkali attack, barrier wall, crack, deck slab, depth of cover, fibre-reinforced polymer (FRP), glass-fibre-reinforced polymer (GFRP).

scholarly journals Strengthening of RC T-Section Beams Subjected to Cyclic Load Using CFRP Sheets

2008 ◽  
Vol 17 (6) ◽  
pp. 096369350801700
Author(s):  
Gokhan Sakar ◽  
Omer Zafer Alku
Keyword(s):  
Cyclic Load ◽  
Analytical Study ◽  
Test Results ◽  
Flexural Behaviour ◽  
Design Code ◽  
Cfrp Sheets ◽  
Reinforced Polymer ◽  
Carbon Fibre Reinforced Polymer ◽  
Fibre Reinforced Polymer ◽  
Strength And Stiffness

The results of an experimental and analytical study of the behaviour of reinforced concrete (RC) T-section beams strengthened with carbon fibre reinforced polymer (CFRP) sheets are presented. Shear deficient specimens are strengthened by using side-bonded and [Formula: see text] - jacketed CFRP sheets. The effect of CFRP sheets on strength and stiffness of the beams is considered for various orientations of the fibres. The main objective of the study is to obtain ductile flexural behaviour from the shear deficient RC beams. To verify the reliability, test results were compared with results of ACI-440 design code, Concrete Society TR55, Fib Bulletin 14 and Colotti et al. model.

New Canadian Highway Bridge Design Code design provisions for fibre-reinforced structures

2007 ◽  
Vol 34 (3) ◽  
pp. 267-283 ◽  
Author(s):  
A A Mufti ◽  
B Bakht ◽  
N Banthia ◽  
B Benmokrane ◽  
G Desgagné ◽  
...  
Keyword(s):  
Prestressed Concrete ◽  
Highway Bridge ◽  
Code Design ◽  
Design Code ◽  
Bridge Design ◽  
Near Surface ◽  
Reinforced Polymer ◽  
Deck Slabs ◽  
Fibre Reinforced Polymer ◽  
Precast Construction

This paper presents a synthesis of the design provisions of the second edition of the Canadian Highway Bridge Design Code (CHBDC) for fibre-reinforced structures. New design provisions for applications not covered by the first edition of the CHBDC and the rationale for those that remain unchanged from the first edition are given. Among the new design provisions are those for glass-fibre-reinforced polymer as both primary reinforcement and tendons in concrete; and for the rehabilitation of concrete and timber structures with externally bonded fibre-reinforced-polymer (FRP) systems or near-surface-mounted reinforcement. The provisions for fibre-reinforced concrete deck slabs in the first edition have been reorganized in the second edition to explicitly include deck slabs of both cast-in-place and precast construction and are now referred to as externally restrained deck slabs, whereas deck slabs containing internal FRP reinforcement are referred to as internally restrained deck slabs. Resistance factors in the second edition have been recast from those in the first edition and depend on the condition of use, with a further distinction made between factory- and field-produced FRP. In the second edition, the deformability requirements for FRP-reinforced and FRP-prestressed concrete beams and slabs of the first edition have been split into three subclauses covering the design for deformability, minimum flexural resistance, and crack-control reinforcement. The effect of sustained loads on the strength of FRPs is accounted for in the second edition by limits on stresses in FRP at the serviceability limit state.Key words: beams, bridges, concrete, decks, fibre-reinforced-polymer reinforcement, fibre-reinforced-polymer sheets, prestressing, repair, strengthening, wood.

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