Rational use of advanced composites in concrete

Burgoyne, CJ

doi:10.1680/stbu.2001.146.3.253

Cited by 33 publications

(11 citation statements)

References 4 publications

(2 reference statements)

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“…The low density, excellent stress-corrosion resistance and low creep and relaxation of CFRP are well known [28]. The above properties make unidirectional CFRP tendons particularly suitable as prestressing reinforcements for concrete elements [29]. The current study used a high performance, centrifugally-cast concrete (high performance spun concrete (HPSC)) of strength class C115 (with a minimum 150 mm cube strength of 115 MPa after 28 days); this material is used for producing slender precast, prestressed poles and pylons in Switzerland [30].…”

Section: Methodsmentioning

confidence: 99%

Long-Term Bending Creep Behavior of Thin-Walled CFRP Tendon Pretensioned Spun Concrete Poles

2014

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This paper discusses the long-term behavior of a series of highly-loaded, spun concrete pole specimens prestressed with carbon fiber-reinforced polymer (CFRP) tendons, which were subjected to outdoor four-point bending creep tests since 1996 in the frame of collaboration with the Swiss precast concrete producer, SACAC (Società Anonima Cementi Armati Centrifugati). The 2 m span cylindrical beams studied are models for lighting poles produced for the last 10 years and sold on the European market. Five thin-walled pole specimens were investigated (diameter: 100 mm; wall-thickness: 25-27 mm). All specimens were produced in a pretensioning and spinning technique and were prestressed by pultruded CFRP tendons. Initially, two reference pole specimens were tested in quasi-static four-point bending to determine the short-term failure moment and to model the short-term flexural behavior. Then, three pole specimens were loaded to different bending creep moments: while the lowest loaded specimen was initially uncracked, the second specimen was loaded with 50% of the short-term bending failure moment and exhibited cracking immediately after load introduction. The highest loaded pole specimen sustained a bending moment of 72% of the short-term bending failure moment for 16.5 years before failing in July 2013, due to the bond failure of the tendons, OPEN ACCESSPolymers 2014, 6 2066 which led to local crushing of the high-performance spun concrete (HPSC). Besides this, long-term monitoring of the creep tests has shown a limited time-and temperature-dependent increase of the deflections over the years, mainly due to the creep of the concrete. A concrete creep-based model allowed for the calculation of the long-term bending curvatures with reasonable accuracy. Furthermore, the pole specimens showed crack patterns that were stable over time and minimal slippage of the tendons with respect to the pole's end-faces for the two lower load levels. The latter proves the successful and durable anchorage of these novel CFRP prestressing tendons in thin-walled, precast concrete members under realistic long-term service loads.

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Section: Methodsmentioning

confidence: 99%

Long-Term Bending Creep Behavior of Thin-Walled CFRP Tendon Pretensioned Spun Concrete Poles

2014

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“…Other sources of ductility may be utilised if it is necessary to overcome this problem. Possible solutions include confinement of the concrete compression zone to provide concrete ductility, use of hybrid FRP rebars or a combination of FRP rebars with different characteristics (Burgoyne, 2001;Harris et al, 1998), failing or being mobilised at different strains, to provide pseudoductility. FRP rebars with plastic bond failure may also be used to develop pseudo-plastic behaviour ( fib, 2001b), or enhanced structural redundancy may be provided through the addition of sacrificial elements that do not lead to collapse once they fail.…”

Section: Flexurementioning

confidence: 99%

“…The compressive strength of FRP reinforcement can be ignored, mainly due to the anisotropic nature of the reinforcement, creep problems and its low contribution to the resistance capacity. However, FRP can be used as compressive reinforcement if concrete confinement is applied or hoop/helical FRP reinforcement is used (Burgoyne, 2001;Ibell et al, 2009).…”

Section: Approach For Moment Resistance Of Frp Rc Elementsmentioning

confidence: 99%

Design guidelines for FRP reinforced concrete structures

Pilakoutas

Guadagnini

Neocleous

et al. 2011

Proceedings of the Institution of Civil Engineers - Structures

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“…The depth of the failure can be large compared with the crack width. Local failure has been observed by Kanematsu et al 10 with FRP reinforcement, and was included in equation (2). Local failure occurs if the force transferred across the reinforcement-concrete interface (which depends on its bond characteristics) exceeds the strength of a conical surface within the concrete.…”

Section: 8mentioning

confidence: 99%

Crack-based analysis of concrete with brittle reinforcement

Stratford¹,

Burgoyne²

2002

Magazine of Concrete Research

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Brittle reinforcement (such as fibre-reinforced plastic) is being developed as an alternative to traditional steel reinforcement. The lack of ductility in a brittle-reinforced beam means that there is very little potential for stress redistribution, and the lower-bound theorem of plasticity (which allows many of the assumptions made in steel-reinforced concrete analysis) cannot be applied. Analysis of brittle-reinforced concrete must be based on a detailed examination of compatibility requirements within a beam, of which the cracks form an important part. A crack-based model is developed in this article, based on compatibility requirements where reinforcement crosses a crack, and compatibility in the compression-zone concrete. The analysis incorporates dowel-rupture of the reinforcement, and the reduced strength of a corner of a stirrup. It highlights the need for further research into flexure-shear of the compression zone, dowel-splitting, and local failure of the concrete. The crack-based model is used to illustrate the importance of compatibility in both the flexural and shear analysis of brittle reinforced concrete. In particular, the current proposals for shear design (which assume pseudo-plastic reinforcement) are examined, and contrasted with compatibility requirements within the beam.

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Rational use of advanced composites in concrete

Cited by 33 publications

References 4 publications

Long-Term Bending Creep Behavior of Thin-Walled CFRP Tendon Pretensioned Spun Concrete Poles

Long-Term Bending Creep Behavior of Thin-Walled CFRP Tendon Pretensioned Spun Concrete Poles

Design guidelines for FRP reinforced concrete structures

Crack-based analysis of concrete with brittle reinforcement

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