{ "types" : { "Bookmark" : { "pluralLabel" : "Bookmarks" }, "Publication" : { "pluralLabel" : "Publications" }, "GoldStandardPublication" : { "pluralLabel" : "GoldStandardPublications" }, "GoldStandardBookmark" : { "pluralLabel" : "GoldStandardBookmarks" }, "Tag" : { "pluralLabel" : "Tags" }, "User" : { "pluralLabel" : "Users" }, "Group" : { "pluralLabel" : "Groups" }, "Sphere" : { "pluralLabel" : "Spheres" } }, "properties" : { "count" : { "valueType" : "number" }, "date" : { "valueType" : "date" }, "changeDate" : { "valueType" : "date" }, "url" : { "valueType" : "url" }, "id" : { "valueType" : "url" }, "tags" : { "valueType" : "item" }, "user" : { "valueType" : "item" } }, "items" : [ { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2f456c4a9df414d0bb5850281d01ef629/petraheim", "tags" : [ "2024","architectural","biocomposites","biomat","dahy","fibre","itke","natural","optimization","profiles","pultruded","spyridonos","structural","witt" ], "intraHash" : "f456c4a9df414d0bb5850281d01ef629", "interHash" : "97a2e8451eca806baf124a89947d8a0c", "label" : "Natural Fibre Pultruded Profiles: Illustration of Optimisation Processes to Develop High-Performance Biocomposites for Architectural and Structural Applications", "user" : "petraheim", "description" : "", "date" : "2024-11-25 10:55:23", "changeDate" : "2024-11-25 10:55:23", "count" : 3, "pub-type": "article", "journal": "Composites Part C: Open Access","publisher":"Elsevier", "year": "2024", "url": "", "author": [ "Evgenia Spyridonos","Martin-Uwe Witt","Klaus Dippon","Markus Milwich","Götz T. Gresser","Hanaa Dahy" ], "authors": [ {"first" : "Evgenia", "last" : "Spyridonos"}, {"first" : "Martin-Uwe", "last" : "Witt"}, {"first" : "Klaus", "last" : "Dippon"}, {"first" : "Markus", "last" : "Milwich"}, {"first" : "Götz T.", "last" : "Gresser"}, {"first" : "Hanaa", "last" : "Dahy"} ], "volume": "14","pages": "100492","abstract": "The selection of materials in the construction industry plays a pivotal role in advancing sustainability goals. Traditional materials derived from natural resources face inherent constraints linked to geographic limitation, growth time, and geometric inconsistency and therefore recent attention has shifted towards developing novel bio-based materials. Composites, offering varying properties and geometries, are becoming increasingly popular for customising materials for specific applications. Pultrusion, a technology for manufacturing linear fibre-reinforced composites, is a well-established and reliable method. This study delves into optimising pultrusion technology, which traditionally relies on synthetic fibres, by exploring the potential of natural alternatives, specifically hemp bast fibres. Additionally, it presents a customised formulation based on a plant-based resin and additives. This formulation is tailored for pultrusion to produce high-performance biocomposites for use as load-bearing components in structural applications, with an initial focus on bending structures. The study elaborates on the material composition and performance of these newly developed natural fibre pultruded profiles, showcasing their mechanical capabilities through rigorous experimentation and testing. The results demonstrate the material's mechanical capabilities showcasing a flexural strength of 260 MPa with a bending modulus of 21 GPa and a bending radius reaching 0.5 m. While this study focuses on the material formulation tested on laboratory-scale pultrusion, the findings will be later applied in an upscaled production at an industrial level, aiming to enhance overall sustainability in the construction industry.", "language" : "eng", "doi" : "https://doi.org/10.1016/j.jcomc.2024.100492", "bibtexKey": "spyridonos2024natural" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2f456c4a9df414d0bb5850281d01ef629/itke", "tags" : [ "biomat","dahy","natural","witt","2024","profiles","optimization","structural","itke","spyridonos","biocomposites","pultruded","architectural","fibre" ], "intraHash" : "f456c4a9df414d0bb5850281d01ef629", "interHash" : "97a2e8451eca806baf124a89947d8a0c", "label" : "Natural Fibre Pultruded Profiles: Illustration of Optimisation Processes to Develop High-Performance Biocomposites for Architectural and Structural Applications", "user" : "itke", "description" : "", "date" : "2024-11-25 10:55:23", "changeDate" : "2024-11-25 10:55:23", "count" : 3, "pub-type": "article", "journal": "Composites Part C: Open Access","publisher":"Elsevier", "year": "2024", "url": "", "author": [ "Evgenia Spyridonos","Martin-Uwe Witt","Klaus Dippon","Markus Milwich","Götz T. Gresser","Hanaa Dahy" ], "authors": [ {"first" : "Evgenia", "last" : "Spyridonos"}, {"first" : "Martin-Uwe", "last" : "Witt"}, {"first" : "Klaus", "last" : "Dippon"}, {"first" : "Markus", "last" : "Milwich"}, {"first" : "Götz T.", "last" : "Gresser"}, {"first" : "Hanaa", "last" : "Dahy"} ], "volume": "14","pages": "100492","abstract": "The selection of materials in the construction industry plays a pivotal role in advancing sustainability goals. Traditional materials derived from natural resources face inherent constraints linked to geographic limitation, growth time, and geometric inconsistency and therefore recent attention has shifted towards developing novel bio-based materials. Composites, offering varying properties and geometries, are becoming increasingly popular for customising materials for specific applications. Pultrusion, a technology for manufacturing linear fibre-reinforced composites, is a well-established and reliable method. This study delves into optimising pultrusion technology, which traditionally relies on synthetic fibres, by exploring the potential of natural alternatives, specifically hemp bast fibres. Additionally, it presents a customised formulation based on a plant-based resin and additives. This formulation is tailored for pultrusion to produce high-performance biocomposites for use as load-bearing components in structural applications, with an initial focus on bending structures. The study elaborates on the material composition and performance of these newly developed natural fibre pultruded profiles, showcasing their mechanical capabilities through rigorous experimentation and testing. The results demonstrate the material's mechanical capabilities showcasing a flexural strength of 260 MPa with a bending modulus of 21 GPa and a bending radius reaching 0.5 m. While this study focuses on the material formulation tested on laboratory-scale pultrusion, the findings will be later applied in an upscaled production at an industrial level, aiming to enhance overall sustainability in the construction industry.", "language" : "eng", "doi" : "https://doi.org/10.1016/j.jcomc.2024.100492", "bibtexKey": "spyridonos2024natural" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/254d3a4a5bf50555dbaa5de703d3440b2/petraheim", "tags" : [ "2022","Additive","Aided","Bending-Active","Computer","Deployable","Design","Digital","Free-Form","Manufacturing","Optimization","Retractable","Spatial","Structural","Structures","Timber","Transformable","basnak","curved","framework","itke","klammer","knippers","körner","magna","material","origami","rihaczek" ], "intraHash" : "54d3a4a5bf50555dbaa5de703d3440b2", "interHash" : "51fb2bb419d32836b7625da9849f5a00", "label" : "Timbr Foldr \u2013 A Design Framework and Material System for Closed Cross - Section Curved Folded Structures", "user" : "petraheim", "description" : "", "date" : "2023-01-17 13:24:46", "changeDate" : "2023-01-17 12:24:46", "count" : 2, "pub-type": "article", "journal": "Journal of the International Association for Shell and Spatial Structures","publisher":"International Association for Shell and Spatial Structures (IASS)","address":"Alfonso XII, 3; 28014 Madrid, Spain", "year": "2022", "url": "", "author": [ "Gabriel Rihaczek","Maximilian Klammer","Okan Basnak","Axel Köerner","Riccardo La Magna","Jan Knippers" ], "authors": [ {"first" : "Gabriel", "last" : "Rihaczek"}, {"first" : "Maximilian", "last" : "Klammer"}, {"first" : "Okan", "last" : "Basnak"}, {"first" : "Axel", "last" : "Köerner"}, {"first" : "Riccardo", "last" : "La Magna"}, {"first" : "Jan", "last" : "Knippers"} ], "volume": "63","number": "4","pages": "272 - 288","abstract": "This research investigated building components that can be produced and transported in a flat state and transformed to a spatial state without scaffolding on-site. Curved folding was employed to allow for a shape change between flat and spatial bending active structures. Bending generally allows for expressive curvature with simple flat production as well as easy customization. Limitations presented by laborious forming and upscaling of individually bent plates were overcome by large-scale curved folding.\r\nThe present research builds upon the context but adds a design framework for volumetric curved folded components, a bistable behavior, and comprehensive detailing regarding upscaling and increased structural capacity. The mechanism was studied on a kinematic level, considering geometrical rules of curved folding and\r\nthe design space. It was also studied on a kinetic level under the consideration of material properties specific to plywood. As a proof of concept, a 1:1 scale demonstrator was built. Finite element modeling software was used to optimize\r\nthe shape. The demonstrator was fabricated flat, folded up, and locked in its stable configuration by the bistability and bases. It supported twelve people with a self-weight of approximately 300kg.", "language" : "eng", "issn" : "1028-365X", "doi" : "https://doi.org/10.20898/j.iass.2022.014", "bibtexKey": "rihaczek2022timbr" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/254d3a4a5bf50555dbaa5de703d3440b2/itke", "tags" : [ "Structures","Structural","magna","knippers","2022","Transformable","framework","Spatial","itke","material","from:petraheim","klammer","Bending-Active","rihaczek","Aided","Free-Form","curved","basnak","Retractable","körner","Digital","Deployable","Timber","Optimization","origami","Design","Additive","Manufacturing","Computer" ], "intraHash" : "54d3a4a5bf50555dbaa5de703d3440b2", "interHash" : "51fb2bb419d32836b7625da9849f5a00", "label" : "Timbr Foldr \u2013 A Design Framework and Material System for Closed Cross - Section Curved Folded Structures", "user" : "itke", "description" : "", "date" : "2023-01-17 13:24:46", "changeDate" : "2023-01-17 12:24:46", "count" : 2, "pub-type": "article", "journal": "Journal of the International Association for Shell and Spatial Structures","publisher":"International Association for Shell and Spatial Structures (IASS)","address":"Alfonso XII, 3; 28014 Madrid, Spain", "year": "2022", "url": "", "author": [ "Gabriel Rihaczek","Maximilian Klammer","Okan Basnak","Axel Köerner","Riccardo La Magna","Jan Knippers" ], "authors": [ {"first" : "Gabriel", "last" : "Rihaczek"}, {"first" : "Maximilian", "last" : "Klammer"}, {"first" : "Okan", "last" : "Basnak"}, {"first" : "Axel", "last" : "Köerner"}, {"first" : "Riccardo", "last" : "La Magna"}, {"first" : "Jan", "last" : "Knippers"} ], "volume": "63","number": "4","pages": "272 - 288","abstract": "This research investigated building components that can be produced and transported in a flat state and transformed to a spatial state without scaffolding on-site. Curved folding was employed to allow for a shape change between flat and spatial bending active structures. Bending generally allows for expressive curvature with simple flat production as well as easy customization. Limitations presented by laborious forming and upscaling of individually bent plates were overcome by large-scale curved folding.\r\nThe present research builds upon the context but adds a design framework for volumetric curved folded components, a bistable behavior, and comprehensive detailing regarding upscaling and increased structural capacity. The mechanism was studied on a kinematic level, considering geometrical rules of curved folding and\r\nthe design space. It was also studied on a kinetic level under the consideration of material properties specific to plywood. As a proof of concept, a 1:1 scale demonstrator was built. Finite element modeling software was used to optimize\r\nthe shape. The demonstrator was fabricated flat, folded up, and locked in its stable configuration by the bistability and bases. It supported twelve people with a self-weight of approximately 300kg.", "language" : "eng", "issn" : "1028-365X", "doi" : "https://doi.org/10.20898/j.iass.2022.014", "bibtexKey": "rihaczek2022timbr" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/27e2ca5a3aff35c16bb99676c359876b3/itke", "tags" : [ "Finite","layup","fiber","knippers","2022","engineering","analysis","filament","Fiber-reinforced","itke","serhan","from:petraheim","winding","(FEA)","Lamination","parameters","methodology","components","guo","buckling","polymer","gil","wound","design","optimization","structural","(FRP)","element","Coreless","architecture" ], "intraHash" : "7e2ca5a3aff35c16bb99676c359876b3", "interHash" : "4f98bbc60a12e811d97756c7daf76b15", "label" : "A design methodology for fiber layup optimization of filament wound structural components", "user" : "itke", "description" : "", "date" : "2022-04-22 12:30:17", "changeDate" : "2022-04-22 10:30:17", "count" : 6, "pub-type": "article", "journal": "Structures","publisher":"ELSEVIER SCI LTD", "year": "2022", "url": "", "author": [ "Yanan Guo","Marta Gil Pérez","Gokhan Serhat","Jan Knippers" ], "authors": [ {"first" : "Yanan", "last" : "Guo"}, {"first" : "Marta", "last" : "Gil Pérez"}, {"first" : "Gokhan", "last" : "Serhat"}, {"first" : "Jan", "last" : "Knippers"} ], "volume": "38","pages": "1125-1136","abstract": "The applications of fiber-reinforced polymer (FRP) composites extend rapidly along with the development of new manufacturing techniques. However, due to the complexities introduced by the material and fabrication processes, the application of conventional structural design methods for construction members has been significantly challenging. This paper presents an alternative methodology to find optimum fiber layups for a given tube-shape geometry via a graphical optimization strategy based on structural performance requirements. The proposed technique employs simplified shell element models based on classical lamination theory (CLT) to avoid explicit fiber modeling in the FEA simulations. Lamination parameters are utilized to generate the reduced stiffness matrices for continuous multi-layer FRP lamination. The fiber layup of the component is retrieved from the optimal lamination parameters that maximize the structural performance. The case study results demonstrate that the developed method provides compact solutions, linking the structural design requirements with optimal fiber orientations and volumetric proportions. In addition, the determined solutions can be interpreted directly by the winding fabrication settings.", "language" : "eng", "doi" : "https://doi.org/10.1016/j.istruc.2022.02.048", "bibtexKey": "guo2022design" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/27e2ca5a3aff35c16bb99676c359876b3/petraheim", "tags" : [ "(FEA)","(FRP)","2022","Coreless","Fiber-reinforced","Finite","Lamination","analysis","architecture","buckling","components","design","element","engineering","fiber","filament","gil","guo","itke","knippers","layup","methodology","optimization","parameters","polymer","serhat","structural","winding","wound" ], "intraHash" : "7e2ca5a3aff35c16bb99676c359876b3", "interHash" : "4f98bbc60a12e811d97756c7daf76b15", "label" : "A design methodology for fiber layup optimization of filament wound structural components", "user" : "petraheim", "description" : "", "date" : "2022-03-02 09:39:23", "changeDate" : "2022-04-22 10:34:03", "count" : 6, "pub-type": "article", "journal": "Structures","publisher":"ELSEVIER SCI LTD", "year": "2022", "url": "", "author": [ "Yanan Guo","Marta Gil Pérez","Gokhan Serhat","Jan Knippers" ], "authors": [ {"first" : "Yanan", "last" : "Guo"}, {"first" : "Marta", "last" : "Gil Pérez"}, {"first" : "Gokhan", "last" : "Serhat"}, {"first" : "Jan", "last" : "Knippers"} ], "volume": "38","pages": "1125-1136","abstract": "The applications of fiber-reinforced polymer (FRP) composites extend rapidly along with the development of new manufacturing techniques. However, due to the complexities introduced by the material and fabrication processes, the application of conventional structural design methods for construction members has been significantly challenging. This paper presents an alternative methodology to find optimum fiber layups for a given tube-shape geometry via a graphical optimization strategy based on structural performance requirements. The proposed technique employs simplified shell element models based on classical lamination theory (CLT) to avoid explicit fiber modeling in the FEA simulations. Lamination parameters are utilized to generate the reduced stiffness matrices for continuous multi-layer FRP lamination. The fiber layup of the component is retrieved from the optimal lamination parameters that maximize the structural performance. The case study results demonstrate that the developed method provides compact solutions, linking the structural design requirements with optimal fiber orientations and volumetric proportions. In addition, the determined solutions can be interpreted directly by the winding fabrication settings.", "language" : "eng", "doi" : "https://doi.org/10.1016/j.istruc.2022.02.048", "bibtexKey": "guo2022design" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2e94756abbf333a26f4a05c249bb3c44f/itke", "tags" : [ "buga","design","detailing","fibre","from:petraheim","gil","heilbronn","itke","knippers","koslowski","optimization","pavilion","peer","rongen","rp11","structural" ], "intraHash" : "e94756abbf333a26f4a05c249bb3c44f", "interHash" : "e71e8cad54d77430a7b011725d04d146", "label" : "Structural design, optimization and detailing of the BUGA fibre pavilion", "user" : "itke", "description" : "", "date" : "2020-12-11 14:29:26", "changeDate" : "2021-07-08 13:27:17", "count" : 6, "pub-type": "article", "journal": "International Journal of Space Structures", "year": "2020", "url": "/brokenurl# https://doi.org/10.1177/0956059920961778", "author": [ "Marta Gil Pérez","Bas Rongen","Valentin Koslowski","Jan Knippers" ], "authors": [ {"first" : "Marta", "last" : "Gil Pérez"}, {"first" : "Bas", "last" : "Rongen"}, {"first" : "Valentin", "last" : "Koslowski"}, {"first" : "Jan", "last" : "Knippers"} ], "editor": [ "Sigrid Adriaenssens","Olivier Baverel","Alireza Behnejad" ], "editors": [ {"first" : "Sigrid", "last" : "Adriaenssens"}, {"first" : "Olivier", "last" : "Baverel"}, {"first" : "Alireza", "last" : "Behnejad"} ], "volume": "35","number": "4","pages": "147-159","abstract": "The BUGA fibre pavilion built in April 2019 at the Bundesgartenschau in Heilbronn, Germany, is the most recent coreless fibre winding research pavilion developed from the collaboration between ICD/ITKE at the University of Stuttgart. The research goal is to create lightweight and high-performance lattice composite structures through robotic fabrication. The pavilion is composed of 60 carbon and glass fibre components, and is covered by a prestressed ethylene tetrafluoroethylene (ETFE) membrane. Each of the components is hollow in section and bone-like in shape. They are joined through steel connectors at the intersecting nodes where the membrane is also supported through steel poles. The components are fabricated by coreless filament winding (CFW), a technique where fibre filaments impregnated with resin are wound freely between two rotating scaffolds by a robotic arm. This novel structural system constitutes a challenge for the designer when proving and documenting the load-carrying capacity of the design. This paper outlines and elaborates on the core methods and workflows followed for the structural design, optimization and detailing of the BUGA fibre pavilion.", "language" : "eng", "eprint" : "https://doi.org/10.1177/0956059920961778", "doi" : "10.1177/0956059920961778", "bibtexKey": "doi:10.1177/0956059920961778" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2bae0baceb7ad6fe3e4770c81992a9f84/petraheim", "tags" : [ "bd2,","buga","design","detailing","fibre","gil","heilbronn","itke","knippers","koslowski","optimization","pavilion","peer","rongen","rp11,","structural" ], "intraHash" : "bae0baceb7ad6fe3e4770c81992a9f84", "interHash" : "e71e8cad54d77430a7b011725d04d146", "label" : "Structural design, optimization and detailing of the BUGA fibre pavilion", "user" : "petraheim", "description" : "", "date" : "2020-12-11 14:29:26", "changeDate" : "2021-07-01 12:46:41", "count" : 6, "pub-type": "article", "journal": "International Journal of Space Structures", "year": "2020", "url": "/brokenurl# https://doi.org/10.1177/0956059920961778", "author": [ "Marta Gil Pérez","Bas Rongen","Valentin Koslowski","Jan Knippers" ], "authors": [ {"first" : "Marta", "last" : "Gil Pérez"}, {"first" : "Bas", "last" : "Rongen"}, {"first" : "Valentin", "last" : "Koslowski"}, {"first" : "Jan", "last" : "Knippers"} ], "volume": "35","number": "4","pages": "147-159","abstract": "The BUGA fibre pavilion built in April 2019 at the Bundesgartenschau in Heilbronn, Germany, is the most recent coreless fibre winding research pavilion developed from the collaboration between ICD/ITKE at the University of Stuttgart. The research goal is to create lightweight and high-performance lattice composite structures through robotic fabrication. The pavilion is composed of 60 carbon and glass fibre components, and is covered by a prestressed ethylene tetrafluoroethylene (ETFE) membrane. Each of the components is hollow in section and bone-like in shape. They are joined through steel connectors at the intersecting nodes where the membrane is also supported through steel poles. The components are fabricated by coreless filament winding (CFW), a technique where fibre filaments impregnated with resin are wound freely between two rotating scaffolds by a robotic arm. This novel structural system constitutes a challenge for the designer when proving and documenting the load-carrying capacity of the design. This paper outlines and elaborates on the core methods and workflows followed for the structural design, optimization and detailing of the BUGA fibre pavilion.", "eprint" : "https://doi.org/10.1177/0956059920961778", "doi" : "10.1177/0956059920961778", "bibtexKey": "doi:10.1177/0956059920961778" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2e07a770b07e1b53bba28ed18f970eba4/itke", "tags" : [ "components","dambrosio","coreless","rongen","frames","gil","knippers","filament","points","system","wound","optimization","structural","itke","from:petraheim","anchor","winding","connection","menges","orientation" ], "intraHash" : "e07a770b07e1b53bba28ed18f970eba4", "interHash" : "08535d6c59a3fe19fbbbd2470eb55304", "label" : "Structural optimization of coreless filament wound components connection \tsystem through orientation of anchor points in the winding frames", "user" : "itke", "description" : "", "date" : "2020-12-11 14:23:16", "changeDate" : "2020-12-11 13:23:16", "count" : 5, "pub-type": "inproceedings", "booktitle": "Proceedings of IASS Annual Symposia 2019: Form and Force","publisher":"International Association for Shell and Spatial Structures (IASS)", "year": "2019", "url": "", "author": [ "Marta Gil Pérez","Niccolo Dambrosio","Bas Rongen","Achim Menges","Jan Knippers" ], "authors": [ {"first" : "Marta", "last" : "Gil Pérez"}, {"first" : "Niccolo", "last" : "Dambrosio"}, {"first" : "Bas", "last" : "Rongen"}, {"first" : "Achim", "last" : "Menges"}, {"first" : "Jan", "last" : "Knippers"} ], "editor": [ "C. Lazaro","K.-U. Bletzinger","E. Onate" ], "editors": [ {"first" : "C.", "last" : "Lazaro"}, {"first" : "K.-U.", "last" : "Bletzinger"}, {"first" : "E.", "last" : "Onate"} ], "volume": "2019","pages": "1381--1388", "bibtexKey": "gilperez2019structural" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2e07a770b07e1b53bba28ed18f970eba4/petraheim", "tags" : [ "anchor","components","connection","coreless","dambrosio","filament","frames","gil","itke","knippers","menges","optimization","orientation","points","rongen","structural","system","winding","wound" ], "intraHash" : "e07a770b07e1b53bba28ed18f970eba4", "interHash" : "08535d6c59a3fe19fbbbd2470eb55304", "label" : "Structural optimization of coreless filament wound components connection \tsystem through orientation of anchor points in the winding frames", "user" : "petraheim", "description" : "", "date" : "2020-12-10 09:24:51", "changeDate" : "2020-12-11 13:23:16", "count" : 5, "pub-type": "inproceedings", "booktitle": "Proceedings of IASS Annual Symposia 2019: Form and Force","publisher":"International Association for Shell and Spatial Structures (IASS)", "year": "2019", "url": "", "author": [ "Marta Gil Pérez","Niccolo Dambrosio","Bas Rongen","Achim Menges","Jan Knippers" ], "authors": [ {"first" : "Marta", "last" : "Gil Pérez"}, {"first" : "Niccolo", "last" : "Dambrosio"}, {"first" : "Bas", "last" : "Rongen"}, {"first" : "Achim", "last" : "Menges"}, {"first" : "Jan", "last" : "Knippers"} ], "editor": [ "C. Lazaro","K.-U. Bletzinger","E. Onate" ], "editors": [ {"first" : "C.", "last" : "Lazaro"}, {"first" : "K.-U.", "last" : "Bletzinger"}, {"first" : "E.", "last" : "Onate"} ], "volume": "2019","pages": "1381--1388", "bibtexKey": "gilperez2019structural" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/24227971b3516b084125d1b37e8dcbac0/petraheim", "tags" : [ "2012","algorithm","architecture","based","dimcic","diss","dissertation","engineering","forschungsbericht","from:petraheim","genetic","grid","itke","optimisation","optimization","shell","structural" ], "intraHash" : "4227971b3516b084125d1b37e8dcbac0", "interHash" : "62f2af1051cae336f6d6ec10e72fed49", "label" : "Structural Optimization of Grid Shells based on Genetic Algorithms", "user" : "petraheim", "description" : "", "date" : "2020-06-24 13:42:52", "changeDate" : "2021-07-01 13:01:33", "count" : 2, "pub-type": "phdthesis", "series": "Forschungsberichte aus dem Institut für Tragkonstruktionen und Konstruktives Entwerfen","publisher":"Stuttgart: Institut für Tragkonstruktionen und Konstruktives Entwerfen","address":"ITKE, Stuttgart, Germany", "year": "2012", "url": "", "author": [ "Milos Dimcic" ], "authors": [ {"first" : "Milos", "last" : "Dimcic"} ], "editor": [ "Jan Knippers" ], "editors": [ {"first" : "Jan", "last" : "Knippers"} ], "volume": "32","abstract": "In the 21st century, as free form design gains popularity, free-form grid shells are becoming a universal structural solution, enabling merger of structure and facade into a single layer - a skin [31]. The subject of the presented work is the optimization of grid structures over some predefined free form shape, with the goal of generating\r\na stable and statically efficient structure. It is shown how combining design and FEM software in an iterative, Genetic Algorithms based, optimization process, stress and displacements in grid shell structures can be significantly reduced, whereby material can be saved and stability enhanced.\r\nWithin this research, design and static analysis software are combined in order to perform a statical optimization of grid shells,generated over a given free form surface. A plug-in for Rhinoceros 3D (software based on NURBS [44] geometry representation) is developed, that uses Genetic Algorithms as an optimization method and implements automated iterative calls to Oasys GSA (commercial FEM static analysis software) in order to generate a statically optimal grid shell. To make this possible, within this research some new types of automatic grid generation are developed. Voronoi\r\ndiagrams [11] were used together with the adapted Force-Density method [38] to develop a new type of grid structure that we called Voronax. In the presented work it was shown that, using the same free form surface, and using the same number of joints and structural members, we can generate much more efficient grid shells,\r\nwhen compared to the standard (uniform) grid structures, simply by modifying the structural grid, i.e., rearranging the structural members of the grid shell.\r\nThe work presented offers an explanation of the entire method and how it can be constructed. The results of the experiments are there to prove its efficiency and credibility. Once it is proved that the method works, its application can take various forms and be left to the creativity of the user and the requirements of the\r\nspecific project.", "isbn" : "978-3-922302-32-2", "language" : "eng", "bibtexKey": "dimcic2012structural" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2b3a4cc8d934e1b348514210472f85a33/itke", "tags" : [ "waimer","2013","magna","knippers","engineering","shell","nature-inspired","optimization","structural","itke","optimisation","from:petraheim","freeform","architecture" ], "intraHash" : "b3a4cc8d934e1b348514210472f85a33", "interHash" : "e8b58afc64283d3e1854def733d09923", "label" : "Nature-inspired structural optimization of freeform shells", "user" : "itke", "description" : "", "date" : "2020-05-22 14:23:59", "changeDate" : "2020-05-22 12:23:59", "count" : 2, "pub-type": "inproceedings", "booktitle": "ICSA 2013- Structures and Architecture","address":"Guimaraes, Portugal", "year": "2013", "url": "", "author": [ "Frédéric Waimer","Riccardo La magna","jan Knippers" ], "authors": [ {"first" : "Frédéric", "last" : "Waimer"}, {"first" : "Riccardo", "last" : "La magna"}, {"first" : "jan", "last" : "Knippers"} ], "language" : "eng", "bibtexKey": "waimer2013natureinspired" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/24227971b3516b084125d1b37e8dcbac0/itke", "tags" : [ "2012","algorithm","architecture","based","dimcic","diss","dissertation","engineering","forschungsbericht","from:petraheim","genetic","grid","itke","optimisation","optimization","shell","structural" ], "intraHash" : "4227971b3516b084125d1b37e8dcbac0", "interHash" : "62f2af1051cae336f6d6ec10e72fed49", "label" : "Structural Optimization of Grid Shells based on Genetic Algorithms", "user" : "itke", "description" : "", "date" : "2020-05-22 14:20:03", "changeDate" : "2020-06-24 11:41:45", "count" : 2, "pub-type": "phdthesis", "series": "Forschungsberichte aus dem Institut für Tragkonstruktionen und Konstruktives Entwerfen","publisher":"Stuttgart: Institut für Tragkonstruktionen und Konstruktives Entwerfen","address":"ITKE, Stuttgart, Germany", "year": "2012", "url": "", "author": [ "Milos Dimcic" ], "authors": [ {"first" : "Milos", "last" : "Dimcic"} ], "editor": [ "Jan Knippers" ], "editors": [ {"first" : "Jan", "last" : "Knippers"} ], "volume": "32","abstract": "In the 21st century, as free form design gains popularity, free-form grid shells are becoming a universal structural solution, enabling merger of structure and facade into a single layer - a skin [31]. The subject of the presented work is the optimization of grid structures over some predefined free form shape, with the goal of generating\r\na stable and statically efficient structure. It is shown how combining design and FEM software in an iterative, Genetic Algorithms based, optimization process, stress and displacements in grid shell structures can be significantly reduced, whereby material can be saved and stability enhanced.\r\nWithin this research, design and static analysis software are combined in order to perform a statical optimization of grid shells,generated over a given free form surface. A plug-in for Rhinoceros 3D (software based on NURBS [44] geometry representation) is developed, that uses Genetic Algorithms as an optimization method and implements automated iterative calls to Oasys GSA (commercial FEM static analysis software) in order to generate a statically optimal grid shell. To make this possible, within this research some new types of automatic grid generation are developed. Voronoi\r\ndiagrams [11] were used together with the adapted Force-Density method [38] to develop a new type of grid structure that we called Voronax. In the presented work it was shown that, using the same free form surface, and using the same number of joints and structural members, we can generate much more efficient grid shells,\r\nwhen compared to the standard (uniform) grid structures, simply by modifying the structural grid, i.e., rearranging the structural members of the grid shell.\r\nThe work presented offers an explanation of the entire method and how it can be constructed. The results of the experiments are there to prove its efficiency and credibility. Once it is proved that the method works, its application can take various forms and be left to the creativity of the user and the requirements of the\r\nspecific project.", "isbn" : "978-3-922302-32-2", "language" : "eng", "bibtexKey": "dimcic2012structural" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2b3a4cc8d934e1b348514210472f85a33/petraheim", "tags" : [ "2013","architecture","engineering","freeform","itke","knippers","magna","nature-inspired","optimisation","optimization","shell","structural","waimer" ], "intraHash" : "b3a4cc8d934e1b348514210472f85a33", "interHash" : "e8b58afc64283d3e1854def733d09923", "label" : "Nature-inspired structural optimization of freeform shells", "user" : "petraheim", "description" : "", "date" : "2020-05-18 14:39:53", "changeDate" : "2020-06-02 10:08:53", "count" : 2, "pub-type": "inproceedings", "booktitle": "ICSA 2013- Structures and Architecture","address":"Guimaraes, Portugal", "year": "2013", "url": "", "author": [ "Frédéric Waimer","Riccardo La magna","jan Knippers" ], "authors": [ {"first" : "Frédéric", "last" : "Waimer"}, {"first" : "Riccardo", "last" : "La magna"}, {"first" : "jan", "last" : "Knippers"} ], "language" : "eng", "bibtexKey": "waimer2013natureinspired" } ] }