Improvements to the Eurocode 2 shrinkage model for concrete using a large experimental database

Raphaël, Wassim; Faddoul, Rafic; Geara, Fadi; Chateauneuf, Alaa

doi:10.1002/suco.201100029

Cited by 14 publications

(7 citation statements)

References 8 publications

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“…When concrete is subjected to a sustained load, time‐dependent strains due to creep and shrinkage develop with a considerable impact on the performance of the structural member. The importance of creep and shrinkage in reinforced concrete beams is well recognized . Over its lifetime, the local strain within a cross section can attain values several times larger than the initial elastic strain, and this can cause undesired serviceability problems in structural members where deflections or crack widths are excessive .…”

Section: Introductionmentioning

confidence: 99%

Long‐term data of reinforced concrete beams subjected to high sustained loads and simplified prediction method

Reybrouck

Criel

Mullem

et al. 2017

Structural Concrete

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In 1967-1985, a research campaign comprising a unique set of long-term experimental data on concrete beams was conducted in joint collaboration with four Belgian research institutes to determine the influence of creep and shrinkage on the long-term behavior of reinforced concrete members. The main aim of the research campaign was the determination of the long-term behavior of cracking and deformations subjected to permanent loads considering the influence of the magnitude of the loads and various reinforcement ratios. The objective of this article is twofold: to provide an overview of the measured data of the reinforced beams of the research campaign, which has never been published before, and to propose a simplified calculation method based on available models in literature that can predict the available measurement data. A simplified calculation model is proposed, which accounts for nonlinear creep strains due to high stresses, shrinkage, aging, and cracking in reinforced concrete beams. This numerical method is based on a cross-sectional analysis formulated using the layered Euler-Bernoulli beam theory, allowing fast and accurate predictions of strains, stresses, and deflections as a function of time based on fib Model Code 2010 and EN1992-1-1. The measurements of the beams subjected to high permanent loads during a time period of 4 years are compared to the results evaluated with the proposed simplified calculation model. The results show that the proposed simplified calculation method based on the current models of EN1992-1-1 and fib Model Code 2010 can predict the long-term behavior of reinforced concrete beams subjected to high loads in good agreement with the measurements.

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Section: Introductionmentioning

confidence: 99%

Long‐term data of reinforced concrete beams subjected to high sustained loads and simplified prediction method

Reybrouck

Criel

Mullem

et al. 2017

Structural Concrete

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“…Vorab sei jedoch noch einmal festgehalten, dass das Schwindmodell im Model Code 2010 (MC 2010) aus den oben genannten Gründen als das das Schwinden zutreffend prognostizierende Referenzmodell angesehen werden muss. Die erhebliche Unterschätzung der tatsächlich eintretenden Schwindmaße bei Anwendung der EN 1992‐1‐1:2004 wurde völlig unabhängig von den hier angestellten Betrachtungen u. a. bereits vor einigen Jahren nachgewiesen [28]. Die bei dieser Analyse zugrunde gelegte Datenbank ist nicht mit jener identisch, die zur Herleitung des Schwindmodells im MC 2010 geführt hat.…”

Section: Vorhersage Des Schwindensunclassified

“…Diese Anhebung wurde in den vorangehenden Ausführungen im Einzelnen begründet und beseitigt die bei der Entwicklung der EN 1992‐1‐1:2004 gemachten Fehler. Völlig unabhängig von den hier angestellten Betrachtungen war in [28] bereits früher festgestellt worden, dass die Angaben in EN 1992‐1‐1:2004 das tatsächliche Schwindverhalten stark unterschätzen (s. Abschn. 3.4.4).…”

Section: Vorhersage Des Schwindensunclassified

Modelle zur Vorhersage des Schwindens und Kriechens von Beton

Müller

Urrea

Kvitsel

2020

Beton und Stahlbetonbau

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Creep and shrinkage prediction models for concrete This autumn the revision of EN 1992-1-1:2004 (Eurocode 2) was finished and the draft of prEN 1992-1-1:2020 was released. Hereby the practice of design will be faced by several new and improved concepts and models. This holds also true for the models for creep and shrinkage of structural concrete, which have partially been completely revised. This article presents in two parts (part 1 Shrinkage, part 2 Creep) the new models for the deformation prediction of concrete and indicates also the related background. This paper deals with shrinkage of concrete. The different types of shrinkage and major characteristics are given at a glance. The developments in codes leading to the currently applied DIN EN 1992-1-1:2011 are indicated. Focus is put on the analysis of the reliability and accuracy of this model. Considerable weaknesses became evident and led to essential improvements being included in prEN 1992-1-1:2020. Many test data confirm the new approach, which is presented here as well. Statistical considerations on the reliability of the new model and a concept how to integrate experimental laboratory data for the improvement of the model are finally presented.

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“…The Eurocode 2 model [19] is one of the most widely used models for predicting shrinkage and creep. Based on a large experimental database, the EC2 shrinkage model has been updated [23], and correction coefficients have also been proposed for the Eurocode 2 creep model [24] but the calculation of these correction coefficients are limited for a specific condition of initial time loading, relative humidity, or compressive strength. For that, it is necessary to improve the creep coefficient prediction by taking into consideration the different concrete mix compositions and the various environmental conditions.…”

Section: Introductionmentioning

confidence: 99%

A Bayesian regression framework for concrete creep prediction improvement: application to Eurocode 2 model

Daou¹,

Raphaël²

2021

Res. Eng. Struct. Mater.

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Concrete is the most widely used material in the construction industry due to its strength, workability and durability. But under a sustained load, concrete is prone to creep causing excessive long-term deflection of structural members, cracks in tensile members, redistribution of stresses over time in composite structures, and loss of prestressing force in prestressed concrete elements. Therefore, structural engineers must accurately predict the concrete creep over the long-term. The concrete creep coefficient is an important entry in many calculations and analyses of reinforced concrete structures. Currently, many models such as the Eurocode 2 model have predicted the concrete creep coefficient. Based on a large database for creep tests, this study aims to improve the prediction of the Eurocode 2 creep coefficient model at long-term by implementing correction coefficients into the model. Since Bayesian-type inferences are suitable tools for revising and updating design codes, the correction coefficients are calculated based on Bayesian linear regression. Statistical indicators demonstrate the accuracy and effectiveness of the proposed improvement and modification.

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Improvements to the Eurocode 2 shrinkage model for concrete using a large experimental database

Cited by 14 publications

References 8 publications

Long‐term data of reinforced concrete beams subjected to high sustained loads and simplified prediction method

Long‐term data of reinforced concrete beams subjected to high sustained loads and simplified prediction method

Modelle zur Vorhersage des Schwindens und Kriechens von Beton

A Bayesian regression framework for concrete creep prediction improvement: application to Eurocode 2 model

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