A structural basis for surface discretization of free form structures: Integration of geometry, materials and fabrication
Başlık çevirisi mevcut değil.
- Tez No: 400136
- Danışmanlar: HARRY GİLES, DR. PETER VON BUELOW
- Tez Türü: Doktora
- Konular: Mimarlık, Architecture
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2012
- Dil: İngilizce
- Üniversite: University of Michigan
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 148
Özet
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Özet (Çeviri)
This study focuses on free form surfaces and the challenges of construction due to thecomplex geometry. A unique approach is proposed that incorporates attributes of form,material selection and fabrication methods of free form surfaces into the early stage of designin aid of optimum mesh generation towards redesigning a practically constructible structure.Free form surfaces need to be discretized into panels with manageable sizes so that thesurface can be fabricated in smaller pieces that are all assembled on site. Planarity has been asignificant constraint for free form discretization because brittle materials, such as glass, canfail suddenly, without any warning. Triangulation has been a common pattern for free formsurface discretization, where the panels are always planar. Due to node complexities oftriangulated meshing, quadrilaterals are considered as an alternative pattern for free formsurfaces. However, the biggest problem with quadrilaterals is that quadrilaterals do notalways form planar faces. A method to generate and apply quadrilateral meshing on freeform surfaces is introduced in this study where pre-deformed (non-planar) quadrilateralpanels are proposed to be used at high curvature areas of the complex surface where planarmeshing is not possible.In this study, structural tests and simulations are conducted on quadrilateral panels to find outthe limits of surface curvature allowed for specific materials. The analyses demonstrate thebehavior of quadrilateral panels under uniform wind load, pre-deformation load and finally acombined load case, which considers wind load on pre-deformed panels. The behavior ofquadrilateral panels under pre-deformation is observed, and the relationship between this predeformationamount and the related structural and geometric design parameters, such aspanel size, thickness, and material properties is investigated. The limiting curvature value forany design then can be determined using these relationships. The results of the study alsodemonstrate that this pre-deformation acts as pre-tensioning that increases the capacity of thepanels to carry more with less deflection.
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