Modelling the prestress transfer in pre-tensioned concrete elements

Abdelatif, Amged O.; Owen, J.S.; Hussein, M.F.M.

doi:10.1016/j.finel.2014.09.007

Cited by 73 publications

(49 citation statements)

References 20 publications

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“…is part of the magnetic flux is not around the whole strand but rather part of its cross-sectional area πx 2 . us, the current density is consistent, and the πx 2 /πr 2 has a magnetic flux linkage that can be written as…”

Section: Formula Derivationmentioning

confidence: 99%

“…e expression of the new analytical model [1,2] is established to estimate the stress distribution of the prestressing tendon, which may have a very important influence on nondestructive detection. A series of studies [3][4][5][6][7][8] show that the performance of prestressed concrete structures will be affected by the prestressed reinforcement corrosion and crack propagation.…”

Section: Introductionmentioning

confidence: 99%

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A Stress Measurement Method for Steel Strands Based on LC Oscillation

Chen

Zhang

et al. 2018

Advances in Materials Science and Engineering

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e prestress loss is one of the main factors affecting the safety of prestressed concrete structure. While the detecting signals like sound and light are difficult to spread in steel strands, there is no effective method for prestress detection of the bonded prestressed steel strands in existing structures yet. In this paper, taking into consideration that the electromagnetic oscillation characteristic can make the signal propagate effectively on the bonded prestressed steel strands, a nondestructive prestress detection method based on the electromagnetic effect to detect oscillation frequency is proposed. In a detection circuit, the steel strands are simulated as an inductance component, in which an induced electromagnetic signal passes through the steel strands to form resonance. And then, a frequency meter is used to detect the oscillation frequency of the resonant circuit. e oscillation frequency is supposed to have relationship with the prestress loading on the steel strands. A section of steel strands with a length of 1.2 m is adopted to test the correlation of stress and oscillation frequency. Both the theoretical and experimental results show that the resonant frequency of the circuit decreases with the increase of the stress of the strand and is linear in a certain range.

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Section: Formula Derivationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Stress Measurement Method for Steel Strands Based on LC Oscillation

Chen

Zhang

et al. 2018

Advances in Materials Science and Engineering

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“…If the surface cools more swiftly than the interior, the compressive strains are released and tensile strains might be produced. Figure 3 shows schematic diagrams of the temperature, stress and strain distributions experienced by casting dies both on heating (during casting) and cooling (after the casting has been extracted from the die) [28,31,32]. Each half of the casting cycle is portrayed by three schematic drawings.…”

Section: Thermal Stress In Diesmentioning

confidence: 99%

Thermal Fatigue of Die-Casting Dies: An Overview

et al. 2016

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Abstract.Coupled studies by experimental and numerical simulations are necessary for an increased understanding of the material behaviour as related to the interaction between the thermal and mechanical conditions. This paper focus on the mechanisms of thermal fatigue in the failure of dies and cores used in the die casting of aluminum alloys. The thermal fatigue resistance is expressed by two crack parameters which are the average maximum crack and the average cracked area. Samples of various types of H13 steel were compared with a standard H13 steel by testing under identical thermal fatigue cycles. To determine the thermal constraint developed in the sample during the test, a finite difference technique was used to obtain the temperature distribution, based on temperature measurements at the boundaries. The resulting stresses and strains were computed, and the strain calculated at the edge or weakest point of the sample was used to correlate the number of cycles to crack initiation. As the strain at the edge increased, the number of cycles to failure decreased. The influence of various factors on thermal fatigue behavior was studied including austenitizing temperature, surface condition, stress relieving, casting, vacuum melting, and resulfurization. The thermal fatigue resistance improved as the austenitizing temperature increased from 1750 to 2050ºF.

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“…The residual prestress force is transferred from CFRP reinforcement to concrete over a length in both extremities of the CFRP through interfacial bond between CFRP-epoxy adhesive and concreteepoxy adhesive connections. This length is known as transmission length, or transfer length, which is one of the critical aspect that should be taken into account for designing the prestressed RC beams [17], but a closed form solution for its analytical prediction still does not exist.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Transfer zone of prestressed CFRP reinforcement applied according to NSM technique for strengthening of RC structures

Rezazadeh

2015

Composites Part B: Engineering

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This study presents an experimental program to assess the tensile strain distribution along prestressed carbon fiber reinforced polymer (CFRP) reinforcement flexurally applied on the tensile surface of RC beams according to near surface mounted (NSM) technique. Moreover, the current study aims to propose an analytical formulation, with a design framework, for the prediction of distribution of CFRP tensile strain and bond shear stress and, additionally, the prestress transfer length. After demonstration the good predictive performance of the proposed analytical approach, parametric studies were carried out to analytically evaluate the influence of the main material properties, and CFRP and groove cross section on the distribution of the CFRP tensile strain and bond shear stress, and on the prestress transfer length. The proposed analytical approach can also predict the evolution of the prestress transfer length during the curing time of the adhesive by considering the variation of its elasticity modulus during this period.

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Modelling the prestress transfer in pre-tensioned concrete elements

Cited by 73 publications

References 20 publications

A Stress Measurement Method for Steel Strands Based on LC Oscillation

A Stress Measurement Method for Steel Strands Based on LC Oscillation

Thermal Fatigue of Die-Casting Dies: An Overview

Transfer zone of prestressed CFRP reinforcement applied according to NSM technique for strengthening of RC structures

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