Concrete creep modelling for structural applications: non-linearity, multi-axiality, hydration, temperature and drying effects

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• 作者：Alain Sellier^a ; ^{alain.sellier@insa-toulouse.fr" class="auth_mail" title="E-mail the corresponding author} ; Sté ; phane Multon^a ; Laurie Buffo-Lacarri&egrave ; re^a ; Thierry Vidal^a ; Xavier Bourbon^b ; Guillaume Camps^b
• 关键词：Concrete (E) ; Creep (C) ; Modelling (E)
• 刊名：Cement and Concrete Research
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：79
• 期：Complete
• 页码：301-315
• 全文大小：2103 K

文摘

Concrete creep models have to consider several important phenomena (non-linearity, multi-axiality, hydration, and thermal and drying effects) to be relevant in structural applications. A selection of experimental results of creep tests found in the scientific literature are used to highlight these phenomena. Firstly, regarding the creep rate in different directions of a specimen under various loads, it is shown that creep rate under moderate loading can derive from elastic strains. Secondly, the reason why a Drucker Prager criterion can be chosen to model non-linear creep is discussed. Thirdly the interest of resorting to a creep theory able to decouple ageing (or hydration) effects and consolidation effects is explained. Moreover, interest using a poro-mechanical formulation, in which Biot coefficient depends on stress state, to model drying creep and shrinkage is discussed in the light of short meso-scopic analysis. The effect of temperature on creep is also addressed. The numerical implementation of the proposed modelling is briefly exposed and the model responses are confronted with experimental results.