Deflection behavior of a prestressed concrete beam reinforced with carbon fibers at elevated temperatures

Faruqi, Mohammed; Khan, Mohammed Sheroz

doi:10.1007/s11709-018-0468-4

Cited by 7 publications

(8 citation statements)

References 17 publications

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“…Consequently, the behaviour until cracking should be comparable for all investigated beam configurations, which was indeed confirmed by the experimental results. When using the transformed area diagram to calculate I cr , see [45], it is obvious that I cr must be smaller than I g . In this case the contribution of the rectangular cross section of the concrete beam decreases while the contribution of the CFRP tendons, due to Steiner's theorem, increases.…”

Section: Effects Of Uhm-cfrp Tendons On the Structural Behaviour Of Prestressed Concrete Beam Elementsmentioning

confidence: 99%

Prestressing low clinker structural concrete elements by ultra-high modulus carbon fibre reinforced polymer tendons

et al. 2021

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The combination of low clinker high-performance concrete (LCHPC) and ultra-high modulus (UHM) carbon fibre reinforced polymer (CFRP) tendons was recently proposed for prestressed structural elements. The 70% reduction in cement content resulting in limited creep and shrinkage of the LCHPC in comparison to a conventional high-performance concrete (HPC) and the very high UHM-CFRP tendon stiffness (> 509 GPa) were expected to impact the mechanical behaviour of such structures. This study focuses on the behaviour of 3 m-long beam specimens during prestressing, concrete hardening and in 4 point-bending experiments. Fibre optic sensors were implemented inside the CFRP tendons to measure strain during those stages and a digital image correlation system was employed to monitor the 4-point-bending tests. After 28 days, the LCHPC recipe, despite a 70% cement reduction and much smaller environmental footprint, did not show measurable differences in the prestress loss behaviour in comparison to a conventional HPC. The UHM-CFRP prestressing tendons, because of their stiffness, showed both higher prestress losses of around 40% and on average a nearly doubled prestress transfer length. However, they increased the beam`s maximum load-bearing capacity by 21% and showed 47% less deflection at failure in comparison to beams prestressed with the standard modulus (UTS)-CFRP tendons.

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Section: Effects Of Uhm-cfrp Tendons On the Structural Behaviour Of Prestressed Concrete Beam Elementsmentioning

confidence: 99%

Prestressing low clinker structural concrete elements by ultra-high modulus carbon fibre reinforced polymer tendons

et al. 2021

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“…Another method of improving the performance of a structural member is eliminating tension in the concrete by the application of prestressing and non-prestressed FRP reinforcement. FRP tendons for prestressing applications are emerging as one of the most promising technologies in the civil engineering industry [1]. Therefore, the combined technique of using FRP reinforcement and reducing tension in a concrete structural member will result in increased serviceability and durability over time.…”

Section: Introductionmentioning

confidence: 99%

“…FRPs are high-performance materials and offer a wide range of applications [1]. However, when used in building applications, they need to conform to fire resistance rating stated in the building codes [1]. When exposed to fire, FRP materials may suffer charring, melting, delamination, cracking and deformation [2].…”

Section: Introductionmentioning

confidence: 99%

Deflection of a Concrete T-beam with Prestressed and Non-prestressed Fiber Reinforcement Polymers at Elevated Temperatures

Faruqi¹,

Dean²,

Aguiniga³

et al. 2021

RPM

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Prestressed concrete members have gained popularity as an efficient and effective way of designing a structural member with the best engineering and material properties. The method of prestressing a structural concrete member has the capability of controlling increased service loads with less depth over longer spans. However, deflections from over-loading or loading over time give a disadvantage to the common steel reinforced concrete members by the effect of corrosion as the structural concrete develop cracks. To prevent corrosion of a structural concrete member, exchanging of steel reinforcement with Fiber Reinforcing Polymers (FRP) has sparked engineering interest in recent years. Both prestressed and non-prestressed FRP reinforcement can reduce tension in concrete. However, the performance of such structural members under elevated temperatures is currently unknown. The knowledge and application of this may lead to a cost effective, and practical consideration in fire safety design. In this article, an analytical model is developed using flexural rigidity of a concrete T-beam with both prestressed and non-prestressed FRP reinforcement to study the deflection behavior at practical elevated temperatures. The model is compared with the finite element model (FEM) of a T-beam with both prestressed and non-prestressed reinforcement subjected to practical elevated temperatures. In addition, comparison is also made with an indirect reference to the real behavior of the material. The results of the analytical model correlated reasonably with the FEM and the real behavior, and were within the accepted range of the American Concrete Institute (ACI) specifications.

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“…is will seriously reduce the bearing capacity and service life of the CFRP-CFST pile. At present, studies have mainly focused on the mechanical properties of CFRP-CFST piles [8]. For example, some static load experiments have been conducted to investigate the axial and flexural behavior of CFRP-CFST piles [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Study on Corrosion Characteristics of Concrete‐Filled CFRP‐Steel Tube Piles under Hygrothermal Environment

Dong

Zhou

Zhuang

2020

Advances in Materials Science and Engineering

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The corrosion damage of pile foundations caused by a hygrothermal environment is a significant factor that influences the service life of high-pile wharf structures. The concrete-filled CFRP-steel tube (CFRP-CFST) pile is a composite structure composed of external Carbon Fiber-Reinforced Polymer (CFRP) sheets and inner concrete-filled steel tubes. It has a high-bearing capacity and excellent corrosion resistance and is an ideal structure for pile foundations in aggressive environments. In this paper, twelve CFRP-CFST pile specimens with diameters of 114 mm and heights of 1200 mm and another forty-two CFRP-steel plate specimens with CFRP widths of 30–50 mm were built. A high hot and humid environment simulation system was designed to conduct corrosion experiments with these specimens. At different theoretical corrosion degrees, the half-cell potential, corrosion products, corrosion expansion, and adhesive property were investigated. The test results showed an obvious increase in the mechanical properties and corrosion resistance when the concrete-filled steel tube was externally bonded to CFRP sheets. The experimental results show that the CFRP-CFST pile is an effective way to protect piles from corrosion and can be widely used for high-pile wharfs in aggressive environments.

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Deflection behavior of a prestressed concrete beam reinforced with carbon fibers at elevated temperatures

Cited by 7 publications

References 17 publications

Prestressing low clinker structural concrete elements by ultra-high modulus carbon fibre reinforced polymer tendons

Prestressing low clinker structural concrete elements by ultra-high modulus carbon fibre reinforced polymer tendons

Deflection of a Concrete T-beam with Prestressed and Non-prestressed Fiber Reinforcement Polymers at Elevated Temperatures

Study on Corrosion Characteristics of Concrete‐Filled CFRP‐Steel Tube Piles under Hygrothermal Environment

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