A finite macro-element for corroded reinforced concrete

François, Raoul; Castel, Arnaud; Vidal, Thierry

doi:10.1617/s11527-006-9096-x

Cited by 28 publications

(41 citation statements)

References 23 publications

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“…Multistrand anchorages and wires will be evaluated in this test bed facility during the next phase of this research effort. Load ( lbf ) Information on the use of analytical methods for assessing the detrimental effects of corrosion damage on structures can be found in Francois et al (2006) and for assessing the effects of broken wires in MacDougal and Bartlett (2005).…”

Section: Signature Fixturementioning

confidence: 99%

Assessing Corrosion Damage and Corrosion Progression in Multistrand Anchor Systems in Use at Corps Projects

Ebeling¹,

Strom²,

Hite³

et al. 2013

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Stressed steel tendons have been used to strengthen hydraulic structures and to improve their serviceability and stability. Over the past three decades, the US Army Corps of Engineers has worked to upgrade its projects by installing high-capacity, post-tensioned foundation anchors. The goal has been to achieve structural stability for Corps hydraulic concrete structures and/or to remediate cracked concrete monoliths. Substantial improvements to protect multistrand anchor systems from corrosion have been made since they were first used at Corps projects more the 50 years ago. Corrosion of older multistrand units is of concern.Researchers at the US Army Engineer Research and Development Center (ERDC) are looking to develop engineering procedures to estimate the current state of load-carrying capacity of the ground anchorage, to estimate remaining life of the tendon, and to establish the deterioration of anchorage capacity (with time) so costly replacement of ground anchorage can be delayed until absolutely needed. Analytical, laboratory, and field-testing efforts will be used to develop a methodology and analytical models. Probabilistic procedures will be used to quantify uncertainties for the primary variables and will be carried into the analytical model. Procedures to extend the life of deteriorating multistrand tendons also will be investigated.A review of Corps projects using multistrand anchors and a literature review of corrosion of the anchors are summarized in this report. Also included are the history and performance of the multistrand anchors at the John Day Navigation Lock (Columbia River, Portland District), along with postinstallation lift-off test results. A summary of a review of nondestructive testing (NDT) to identify defects in the anchors is part of this report, too.

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Section: Signature Fixturementioning

confidence: 99%

Assessing Corrosion Damage and Corrosion Progression in Multistrand Anchor Systems in Use at Corps Projects

Ebeling¹,

Strom²,

Hite³

et al. 2013

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“…The length necessary for the ordinary reinforcing bars to redevelop the full tension force in the concrete, lost by the occurrence of the crack, is the transfer length L t [5]. The strain variation of the ordinary reinforcing steel is assumed non linear along the transfer length in accordance with experimental observations [6]. The function distribution of the steel strain ε s (x) is given by Eq.…”

Section: Steel Strain Distribution Between Two Cracksmentioning

confidence: 99%

“…where ΔA s0 is the section loss threshold that initiates the first crack [9], ΔA sm is the average section loss of the reinforcing bar along L elem [10], n = 5 is an empirical parameter describing the quantitative variation of the progressive debonding versus the section loss of the reinforcement [6]. This damage variable is also included in the calculation of the neutral axis evolution in uncracked cross-section versus corrosion propagation: y 0nc (D c ) = y 0c + (1-D c )(y 0nc -y 0c ).…”

Section: Corrosion Damagementioning

confidence: 99%

Modelling the Stiffness Reduction of Corroded Reinforced Concrete Beams after Cracking

Castel

Coronelli

François

et al. 2011

Modelling of Corroding Concrete Structures

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Abstract. The serviceability of reinforced concrete structures (i.e., bending stiffness) is mostly affected by the corrosion of the tension reinforcement (steel cross-section and the steel-concrete bond reduction). This paper presents two models aiming to predict the stiffness degradation of corroded reinforced concrete beams particularly after cracking. The two modelling approaches are: beam MacroFinite-Elements (MFE) using cross-section analysis developed at the LMDC Toulouse and 2D nonlinear finite element analysis developed at Politecnico di Milano. Both, the steel cross-section and bond reduction versus corrosion rate are taken into account. The models are validated by simulating tests on a 23 year old corroded beam from long term experiments still in progress at LMDC. Results show a good agreement between both simulations and the experimental responses and highlight the predominant influence of the steel-concrete bond loss.

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“…If the transmission length is infinite (L t = ∞), I a is equal to the inertia of the cracked cross-section, I c . The ratio L t to L elem /2 can be evaluated through experiments on tension members cast with the same concrete of the beam and the same bonded reinforcing bars [7]. It could also be evaluated from analytical models available in the literature such as the FIB-MC90 [18] or from Piyasena et al [19].…”

Section: Fig 4 Shows the Theoretical Variation Of Average Inertia I mentioning

confidence: 99%

“…The calculation of deflections after cracking is based on a new macro finite element (M.F.E.). This M.F.E., initially developed for reinforced concrete structures [7], is extended to the case of prestressed concrete structures in this paper. It is a beam finite element (for bending problems) characterized mainly by its homogeneous average inertia.…”

Section: Introductionmentioning

confidence: 99%

Response of post-tensioned concrete beams with unbonded tendons including serviceability and ultimate state

Castel

François

2010

Engineering Structures

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A finite macro-element for corroded reinforced concrete

Cited by 28 publications

References 23 publications

Assessing Corrosion Damage and Corrosion Progression in Multistrand Anchor Systems in Use at Corps Projects

Assessing Corrosion Damage and Corrosion Progression in Multistrand Anchor Systems in Use at Corps Projects

Modelling the Stiffness Reduction of Corroded Reinforced Concrete Beams after Cracking

Response of post-tensioned concrete beams with unbonded tendons including serviceability and ultimate state

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