Documents disponibles écrits par cet auteur

Modelling time to failure of notched beams under random humidity variations of Atlantic environment / Myriam Chaplain in European journal of environmental and civil engineering, Vol. 15 N° 7 (Août 2011) 

Public ISBD [article]  in European journal of environmental and civil engineering > Vol. 15 N° 7 (Août 2011) . - pp. 1059-1072 Titre : Modelling time to failure of notched beams under random humidity variations of Atlantic environment Type de document : texte imprimé Auteurs : Myriam Chaplain, Auteur ; Denys Breysse, Auteur ; Antoine Marache, Auteur Année de publication : 2011 Article en page(s) : pp. 1059-1072 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Wood  Relative  humidity  modelling  Crack  initiation  and  propagation  Lifetime  modelling Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : The mechanical response and durability of timber structures is highly influenced by the atmospheric conditions. Wood mechanical properties depend on moisture content, on temperature and on their variations. To study the lifetime of timber components in their environment, climatic variations are simulated and a lifetime model is proposed. The model predicts the incubation time and the time of crack propagation until the failure. As temperature has a smaller influence on the time to failure than relative humidity, its effects are not directly taken into account in the model. Predictions of the proposed model for various air humidity simulations are compared to creep test results obtained on notched beams under various climatic conditions. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/article.jsp?articleId=16507 [article] Modelling time to failure of notched beams under random humidity variations of Atlantic environment [texte imprimé] / Myriam Chaplain, Auteur ; Denys Breysse, Auteur ; Antoine Marache, Auteur . - 2011 . - pp. 1059-1072. Génie Civil Langues : Anglais (eng) in European journal of environmental and civil engineering > Vol. 15 N° 7 (Août 2011) . - pp. 1059-1072 Mots-clés : Wood  Relative  humidity  modelling  Crack  initiation  and  propagation  Lifetime  modelling Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : The mechanical response and durability of timber structures is highly influenced by the atmospheric conditions. Wood mechanical properties depend on moisture content, on temperature and on their variations. To study the lifetime of timber components in their environment, climatic variations are simulated and a lifetime model is proposed. The model predicts the incubation time and the time of crack propagation until the failure. As temperature has a smaller influence on the time to failure than relative humidity, its effects are not directly taken into account in the model. Predictions of the proposed model for various air humidity simulations are compared to creep test results obtained on notched beams under various climatic conditions. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/article.jsp?articleId=16507

Random temperature and humidity models in Atlantic environment / Denys Breysse in European journal of environmental and civil engineering, Vol. 15 N° 7 (Août 2011) 

Public ISBD [article]  in European journal of environmental and civil engineering > Vol. 15 N° 7 (Août 2011) . - pp. 1045-1058 Titre : Random temperature and humidity models in Atlantic environment Type de document : texte imprimé Auteurs : Denys Breysse, Auteur ; Myriam Chaplain, Auteur ; Antoine Marache, Auteur Année de publication : 2011 Article en page(s) : pp. 1045-1058 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Humidity  Random  variations  Temperature  Time  correlation  Variographical  analysis  Weather  modeling Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : Moisture and temperature variations have a high influence on building materials behavior, like creep and durability in timber or activity of corrosion in reinforced concrete. Improving the prediction of these behaviors requires a better modeling of these variations. Variations of temperature and humidity recorded during several years at an hourly time step have been analyzed so as to make the part between a deterministic signal (explained by astronomical reasons) and a stochastic part. The variographical analysis for temperature has revealed a correlation structure of about seven days. The humidity is considered as a random variable whose variations are constrained by temperature values and physical laws (air saturation). The combined simulation enables to build synthetic climates, which present the same patterns, in terms of statistical distribution and time dynamics than real data records. These synthetic signals will be used for studying the building materials response under longterm environmental loading. An application to timber durability will be presented in a companion paper. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/article.jsp?articleId=16506 [article] Random temperature and humidity models in Atlantic environment [texte imprimé] / Denys Breysse, Auteur ; Myriam Chaplain, Auteur ; Antoine Marache, Auteur . - 2011 . - pp. 1045-1058. Génie Civil Langues : Anglais (eng) in European journal of environmental and civil engineering > Vol. 15 N° 7 (Août 2011) . - pp. 1045-1058 Mots-clés : Humidity  Random  variations  Temperature  Time  correlation  Variographical  analysis  Weather  modeling Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : Moisture and temperature variations have a high influence on building materials behavior, like creep and durability in timber or activity of corrosion in reinforced concrete. Improving the prediction of these behaviors requires a better modeling of these variations. Variations of temperature and humidity recorded during several years at an hourly time step have been analyzed so as to make the part between a deterministic signal (explained by astronomical reasons) and a stochastic part. The variographical analysis for temperature has revealed a correlation structure of about seven days. The humidity is considered as a random variable whose variations are constrained by temperature values and physical laws (air saturation). The combined simulation enables to build synthetic climates, which present the same patterns, in terms of statistical distribution and time dynamics than real data records. These synthetic signals will be used for studying the building materials response under longterm environmental loading. An application to timber durability will be presented in a companion paper. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/article.jsp?articleId=16506