cours en ba1 ppt
TRANSCRIPT
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Formes et fonctions structurales :le retour
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Rappels de la semaine passée
• notion de structure
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sculpture
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Rappels de la semaine passée
• problématique structurale : reprendre une charge de manière déviée = ponter
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Est-ce vraiment tout ?
La réponse est dans…
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Autre problématique structurale
• reprendre une charge de manière alignée sur celle-ci = supporter
? ?
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Première possibilité
Colonne comprimée
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Seconde possibilité
Tirant tendu
structure annexe
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Colonnes
Problème du flambement
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Lutte contre le flambement 1
Un matériau plus résistant et plus rigide
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De la pierre…
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… à la fonte…
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… à l’acier
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Un matériau plus résistant etplus rigide
Quantification ?
=> apprendre le dimensionnement pour pouvoir comparer !
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Lutte contre le flambement 2
Une section de forme élargie
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De la section pleine…
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… à la section profilée…
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… à la section creuse
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Une section de forme élargie
Quantification ?
=> apprendre le dimensionnement pour pouvoir comparer !
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Lutte contre le flambement 3
Multiplication des appuis
ExempleExemple : les colonnes haubanées
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Bâtiment GlaxoSmithKline à Rixensart (Samyn, 1999)
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Tirant
Problème du maillon faible
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Lutte contre le maillon faible
• Un matériau industriel de qualité garantie
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Des fibres
végétales…
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… à l’acier
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Est-ce vraiment tout ?...
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Vent, séisme
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Contreventer / stabiliser
= assurer la stabilité horizontale aussi
Plusieurs systèmes :
• diagonales, colonnes ou suspentes inclinées
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Contreventer / stabiliser
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Métro Sainte-Catherine
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Banc place Flagey
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Contreventer / stabiliser
• Croix (de Saint-André)
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Bâtiment industriel métallique type
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Bureaux Achmea à
Zwolle (LKSVDD +
Grontmij, 2007)
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John Hancock Centre Chicago (344 m) 1970
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Contreventer / stabiliser
• Encastrements, externes ou internes
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Portique d’affichage autoroutier
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Contreventer / stabiliser
• Murs de refend, voiles
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Le vitrage comme contreventement
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Mais une structure ne sert-elle qu’à reprendre des charges ?...
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Crematorium de Treptow(Axel Shultes, 1998)
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Magasin Fragile Lab à Anvers (Import/
export Arch., 2008)
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À suivre… la semaine prochaine !