Flexural performance of pretensioned ultra-high performance fibre reinforced concrete beams with CFRP tendons

Sturm, Alexander B.; Visintin, Phillip; Seracino, R.; Lucier, Gregory; Oehlers, Deric J.

doi:10.1016/j.compstruct.2020.112223

Cited by 15 publications

(7 citation statements)

References 31 publications

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“…However, in between there appears to be many small discontinuous fractures indicating microcracking. This variation of large distinct cracks in some sections and small discontinuous cracks was also observed in Sturm et al 8 in pretensioned flexural members. It is hypothesized that this related to the inconsistent strain hardening of the UHPFRC observed during the direct tension tests conducted in Visintin et al 13 where some specimens from the same mix would display substantial strain hardening or none at all.…”

Section: Tension-stiffening Testssupporting

confidence: 83%

“…5 This overestimate has been shown to be particularly important when quantifying the ductility of ultra-high performance fiber reinforced concrete (UHPFRC) flexural members, which commonly fail, by reinforcement rupture. 8,9 Analogous findings were also reported by Moreno et al 10 who found that the average strains in tension-stiffening specimens at the fracture of the reinforcement were significantly lower than the fracture strain of the reinforcement for specimens with fibers.…”

Section: Introductionsupporting

confidence: 78%

“…To represent this behavior, the stressstrain relationship of the UHPFRC after the formation of the first macro-crack is assumed to follow Equation (19). For simplicity this unloading modulus has assumed to be equal to the initial elastic modulus as was done in Sturm et al 8,9,24 where it was found that this assumption did not influence the accuracy of the predictions. This simplification is implemented as it removes the need to determine the unloading modulus experimentally.…”

Section: Tension-stiffening Testsmentioning

confidence: 99%

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Pre‐ and post‐yield bond, tension‐stiffening, and cracking in ultra‐high performance fiber reinforced concrete

Sturm

Visintin

2022

Structural Concrete

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In reinforced concrete elements, tension‐stiffening strongly influences deflections and crack‐widths at the serviceability limit, and plastic hinge rotation at the ultimate limit. Modeling has shown the impact of tension‐stiffening at the ultimate limit to be particularly important when ultimate failure is governed by reinforcement rupture, which has been is common in ultra‐high performance fiber reinforced concrete (UHPFRC) elements. It is further known that the magnitude of tension‐stiffening and crack opening is proportional to both the reinforcement ratio of the tension chord and the diameter of the reinforcing bar. Despite this understanding, very little testing has been undertaken to quantify the bond between larger diameter reinforcement and UHPFRC and also on the resulting impact to tension‐stiffening and concrete cracking. To address these issues, in this paper a series of bond and tension‐stiffening tests are undertaken on ultra‐high performance concretes both with and without steel fibers. The result of the experiments is used to develop a local bond stress slip relationship applicable to both pre‐ and post‐yield. When implemented in a partial‐interaction model, it is shown that the new bond model can be used to predict pre‐ and post‐yield tension‐stiffening and crack‐widths.

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Section: Tension-stiffening Testssupporting

confidence: 83%

Section: Introductionsupporting

confidence: 78%

Section: Tension-stiffening Testsmentioning

confidence: 99%

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Pre‐ and post‐yield bond, tension‐stiffening, and cracking in ultra‐high performance fiber reinforced concrete

Sturm

Visintin

2022

Structural Concrete

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“…In recent years, this measurement technique has been used more and more often in various fields of study: civil engineering [4], applied mechanics [5], biology [6], aerospace engineering [7] and others [8,9]. In particular, it should be noted that the DIC technique is nowadays used in the research of prestressed concrete [10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Determination of bond model for 7-wire strands in pretensioned concrete beam

et al. 2021

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A correct choice of a bond model for prestressing tendons is crucial for the right modelling of a structural behaviour of a pretensioned concrete structure. The aim of this paper is the determination of an optimal bond model for 7-wire strands in a prestressed concrete beam produced in a precast concrete plant of Consolis Poland. ATENA 3D is used to develop finite element models of the beam that differ only in a bond stress-slip relationship of tendons. The bond stress-slip relationships for modelling are taken from the results of bond tests carried out by different researchers in previous years. Moreover, for comparison purposes, a simplified 2D model of the beam is created in Autodesk Robot. The strain distribution at the time of the strand release is found for each of the finite element models. The determined strain distributions are compared with the strain distribution in the beam established by an experimental test using a measuring system based on a digital image correlation. On the basis of the comparison results, the most appropriate bond models for 7-wire strands used in the beam are identified.

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“…UHPC was also used to repair bridge columns under the combined effect of constant axial and cyclic lateral loads (21,22). Several studies investigated the structural behavior of prestressed UHPC beams (23)(24)(25)(26) and the feasibility study of applying UHPC in bridge decks (27). The shear behavior of UHPC girders was also investigated (28)(29)(30)(31)(32)(33).…”

mentioning

confidence: 99%

Behavior of Ultrahigh-Performance Concrete Plates Encasing Steel H-Piles

Shrestha

Gheni

Abdulazeez

et al. 2023

Transportation Research Record: Journal of the Transportation R

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Steel H-piles are exposed during their service life to wet-dry cycles in combination with salts, such as deicing, that may result in corrosion, leading to cross-sectional loss and reduction in axial load-carrying capacity. This paper proposes an innovative repair method for corroded steel H-piles using ultrahigh-performance concrete (UHPC) plates. The UHPC plates are reinforced with carbon fiber-reinforced polymer (CFRP) grids. The UHPC plates bridge the corroded segment so that the axial force bypasses the corroded segment. The UHPC are bolted to the steel H-pile using high-strength bolt connectors (HSBCs). Eleven steel H-piles bolted with UHPC plates were investigated experimentally under push-out loading to quantify the axial force that can be transferred from a steel H-pile to UHPC plates through HSBCs. The examined parameters were the UHPC plate thickness, the diameter of HSBC, and the number of CFRP grid layers. The results were compared with those predicted using different design codes and guidelines. The UHPC plates attached to the steel H-pile could transfer axial loads ranging from 35% to 98% of the steel H-piles’ ultimate axial capacity. Further, the installation of the UHPC plate on a steel pile can be completed in about 2 h with minimal equipment, making it a promising repair candidate in real-world applications.

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Flexural performance of pretensioned ultra-high performance fibre reinforced concrete beams with CFRP tendons

Cited by 15 publications

References 31 publications

Pre‐ and post‐yield bond, tension‐stiffening, and cracking in ultra‐high performance fiber reinforced concrete

Pre‐ and post‐yield bond, tension‐stiffening, and cracking in ultra‐high performance fiber reinforced concrete

Determination of bond model for 7-wire strands in pretensioned concrete beam

Behavior of Ultrahigh-Performance Concrete Plates Encasing Steel H-Piles

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