Novel semi-analytical model to calculate shear forces due to viscoelastic interactions

Autor: Jean-Michel Torrenti, Jean-Philippe Sellin, Helder Sousa, Jean-François Barthélémy
Přispěvatelé: Centre d'Etudes et d'Expertise sur les Risques, l'Environnement, la Mobilité et l'Aménagement - Equipe-projet DIMA (Cerema Equipe-projet DIMA), Centre d'Etudes et d'Expertise sur les Risques, l'Environnement, la Mobilité et l'Aménagement (Cerema), Department of civil and environmental engineering [Guildford], University of Surrey (UNIS), Département Matériaux et Structures (IFSTTAR/MAST), PRES Université Paris-Est-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)
Rok vydání: 2019
Předmět:
Zdroj: Analytical Sciences
Analytical Sciences, Nihon Bunseki Kagakkai, 2019, 183, pp. 999-1013. ⟨10.1016/j.engstruct.2018.12.015⟩
ISSN: 0141-0296
0910-6340
1348-2246
DOI: 10.1016/j.engstruct.2018.12.015
Popis: The aim of this work is to discuss the importance of the time-dependent shear forces in long span bridges built bythe cantilever method, mainly in the connection sections between cantilevers when hinge devices exist. Theapproach considers the time-dependent properties of concrete and prestressing steel towards a simplified modelable to rapidly estimate the order of magnitude and the evolution of these shear forces over time. Hence, a novelsemi-analytical model is presented, which indeed allows to better understand the behaviour of these bridges bytaking into account both the interactions between cantilevers and the construction phases. In addition, settlementsof abutments and piers are also considered in the formulation by taking advantage of vertical displacementmeasurements if available. From the point of view of practitioners, this semi-analytical model can be seenas an efficient preliminary study to better assess the importance (or not) of these shear forces, without anyspecific software and computation requirements. A case study – the Savines Bridge –, is used to assess the modelperformance. The results show shear forces should not be neglected for assessments purposes. Moreover, thesesshear forces become more important as the cantilever is nearer to the abutments.; The aim of this work is to discuss the importance of the time-dependent shear forces in long span bridges built by the cantilever method, mainly in the connection sections between cantilevers when hinge devices exist. The approach considers the time-dependent properties of concrete and prestressing steel towards a simplified model able to rapidly estimate the order of magnitude and the evolution of these shear forces over time. Hence, a novel semi-analytical model is presented, which indeed allows to better understand the behaviour of these bridges by taking into account both the interactions between cantilevers and the construction phases. In addition, settlements of abutments and piers are also considered in the formulation by taking advantage of vertical displacement measurements if available. From the point of view of practitioners, this semi-analytical model can be seen as an efficient preliminary study to better assess the importance (or not) of these shear forces, without any specific software and computation requirements. A case study - the Savines Bridge -, is used to assess the model performance. The results show shear forces should not be neglected for assessments purposes. Moreover, theses shear forces become more important as the cantilever is nearer to the abutments.
Databáze: OpenAIRE
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