Influence of long‐term creep on prestressed concrete beams in relation to deformations and structural resistance: Experiments and modeling

Reybrouck, Nicky; Mullem, Tim Van; Taerwe, Luc; Caspeele, Robby

doi:10.1002/suco.201900418

Cited by 9 publications

(4 citation statements)

References 20 publications

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“…Prestressed concrete beams having parabolic tendons were tested by Reybrouck et al 20 for a period of 4.5 years. Ten beams having an I‐shaped cross‐section and six beams with rectangular cross‐section were tested under a sustained load applied using the four‐point loading setup having 40 MPa cube strength.…”

Section: Introductionmentioning

confidence: 99%

Experimental and analytical studies on shrinkage and creep behavior of RC walls and prisms

Shariff

Menon

Saravanan

2023

Structural Concrete

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A component level experimental study has been carried out on four reinforced concrete (RC) walls subjected to a sustained compressive load for a period of 1 year and shrinkage tests on 10 prisms under ambient environmental conditions. Two extreme longitudinal reinforcement percentages and two grades of concrete were considered and their influence on the time‐dependent behavior studied. It was observed that both longitudinal percentage of steel and concrete grade have a significant influence on the time‐dependent strains. The evolution of time‐dependent strain in RC member was also predicted, adequately accounting for the effect of reinforcement, using a theoretical model which can employ any linear viscoelastic constitutive law for concrete and a linear elastic constitutive law for reinforcing steel. The ACI 209 and fib MC 10 recommendations for creep and shrinkage of plain concrete have been used for the prediction of long‐term strains. It is demonstrated that the analysis predicts the time‐dependent strains reasonably well (with a statistical mean deviation error of 1.16 and 1.00) for the creep tests on RC walls, when the compliance function proposed by ACI and fib is used. However, in the case of shrinkage tests, the accuracy with both ACI and fib models was limited (1.64 and 1.66, respectively). It is further demonstrated that by suitably recalibrating the compliance and shrinkage parameters in both ACI and fib models, the accuracy of shrinkage prediction in the companion RC specimens improves significantly with mean deviation error of 1.07 and 1.05 for ACI and fib models, respectively.

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Section: Introductionmentioning

confidence: 99%

Experimental and analytical studies on shrinkage and creep behavior of RC walls and prisms

Shariff

Menon

Saravanan

2023

Structural Concrete

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“…This paper provides a concise review of the concrete creep studies in compression, tension and flexure of plain concrete reported in literature. Studies on plain concrete subject to bending in literature are limited as most of the recent research is focussed on bending creep in reinforced concrete [1][2][3] and prestressed concrete [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Flexural creep in plain concrete: State of the Art

Williams¹,

Menon

Prasad

2022

ASPS Conf. Proc.

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Concrete, being a viscoelastic material, creeps with time causing additional strains and deflections in flexural members. Most of the studies in creep of concrete are based on long-term tests on plain concrete standard cylinders under axial compression, very limited studies have been reported on creep of concrete in flexure and direct tension. Whether the mechanism of creep in tension is different from creep in compression is still being debated. Numerous studies have been reported in the literature showing varied results with regard to the effects of creep in direct compression, direct tension and flexure. This paper provides a brief review of various creep tests on plain concrete reported and attempts to understand the effects of various parameters on the creep behaviour of concrete. Some studies reported that the creep in tension is higher than that in compression, whereas a few others obtained contradictory results from creep tests. This may be attributed to the fact that the relative creep behaviour in tension and compression is highly sensitive to the material composition, exposure conditions and loading level. The studies by various researchers on flexural creep in plain concrete are also discussed.

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“…Since the 1960s, pre‐stressed concrete (PC) members have been used in building structures and infrastructure facilities due to their advantages such as higher quality, more economic efficiency, a shorter span of construction, and more durable aesthetics 38,39 . A glance at the history of using the post‐tensioning as a type of pre‐stressing in composite sections shows that post‐tensioning the concrete core of composite sections has been used for the first time in the construction of the arch bridge in Aurora 40,41 …”

Section: Introductionmentioning

confidence: 99%

“…38,39 A glance at the history of using the post-tensioning as a type of pre-stressing in composite sections shows that post-tensioning the concrete core of composite sections has been used for the first time in the construction of the arch bridge in Aurora. 40,41 Wang et al 42 studied the axial behavior (compressive and tensile) and the design of hot-finished high-strength steel tubular elements with internal pre-stressed cables experimentally and numerically and used verified numerical models for these elements under compression to conduct a parametric study of their behavior. Their study showed that the presence of the cables enhanced the tensile capacity of the members while the addition of prestress extended the elastic range.…”

Section: Introductionmentioning

confidence: 99%

Structural behavior of prestressed self‐compacting concrete‐encased concrete‐filled steel tubes beams

Rahmani

Naghipour

Nematzadeh

2021

Structural Concrete

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Concrete‐encased concrete‐filled steel tubes (CFST) has extensive applications in the world. According to previous researches, if the CFST is placed in the compression zone, the confinement increases, and the compressive capacity of the concrete is completely used. The prestressed strands also increase the core concrete confinement and eliminate tension cracks. Therefore, in this paper, to achieve the benefits of CFST and prestressed strand, for the first time, a novel concept called prestressed concrete‐encased CFST (PCE‐CFST) beams were introduced. The main objective of the combination of steel tube and pre‐stressed strands is to increase the core concrete compressive strength and control the concrete crack in the tension zone. Six beams were constructed using self‐compacting concrete to investigate the influence of variations in the pre‐stressing force level of the pre‐stressed strands, the pre‐stressed strands eccentricity, and the steel tubes diameter‐to‐thickness ratio on the structural performance of these members. The specimens were tested under four‐point loading. The results showed that the pre‐stressed strands increased the confinement effect on the core concrete and improved the bearing capacity, ductility, and bending stiffness. The steel tubes improved the bearing capacity, ductility, and energy absorption, while they did not significantly affect the bending stiffness. Finally, it was shown that the pre‐stressed strands increased the bearing capacity, energy absorption, and bending stiffness in reinforced concrete beams.

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Influence of long‐term creep on prestressed concrete beams in relation to deformations and structural resistance: Experiments and modeling

Cited by 9 publications

References 20 publications

Experimental and analytical studies on shrinkage and creep behavior of RC walls and prisms

Experimental and analytical studies on shrinkage and creep behavior of RC walls and prisms

Flexural creep in plain concrete: State of the Art

Structural behavior of prestressed self‐compacting concrete‐encased concrete‐filled steel tubes beams

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