{ "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/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/29d8c29c3c6fca4063d9568b527b7508f/petraheim", "tags" : [ "NFRP","baszynski","biomat","coreless","costalonge","cutajar","dahy","fabrication","fiber","fiber-reinforced","filament","forms","hoven","itke","moldless","natural","placement","ploymer","spatial","structures","tailored","techniques","winding" ], "intraHash" : "9d8c29c3c6fca4063d9568b527b7508f", "interHash" : "bc5ba4f94ac3b4f7737b39c85536917f", "label" : "FlexFlax Stool: Validation of Moldless Fabrication of Complex Spatial Forms of Natural Fiber-Reinforced Polymer (NFRP) Structures through an Integrative Approach of Tailored Fiber Placement and Coreless Filament Winding Techniques", "user" : "petraheim", "description" : "", "date" : "2020-11-20 13:37:55", "changeDate" : "2024-01-10 16:31:55", "count" : 3, "pub-type": "article", "journal": "Applied Sciences", "year": "2020", "url": "", "author": [ "V.anessa Costalonga Martins","Sacha Cutajar","Christo van der Hoven","Piotr Baszyński","Hanaa Dahy" ], "authors": [ {"first" : "V.anessa", "last" : "Costalonga Martins"}, {"first" : "Sacha", "last" : "Cutajar"}, {"first" : "Christo", "last" : "van der Hoven"}, {"first" : "Piotr", "last" : "Baszyński"}, {"first" : "Hanaa", "last" : "Dahy"} ], "volume": "10","number": "9","pages": "3278","abstract": "It has become clear over the last decade that the building industry must rapidly change to meet globally pressing requirements. The strong links between climate change and the environmental impact of architecture mean an urgent necessity for alternative design solutions. In order to propose them in this project, two emergent fabrication techniques were deployed with natural fiber-reinforced polymers (NFRPs), namely tailored fiber placement (TFP) and coreless filament winding (CFW). The approach is explored through the design and prototyping of a stool, as an analogue of the functional and structural performance requirements of an architectural system. TFP and CFW technologies are leveraged for their abilities of strategic material placement to create high-performance differentiated structure and geometry. Flax fibers, in this case, provide a renewable alternative for high-performance yarns, such as carbon, glass, or basalt. The novel contribution of this project is exploring the use of a TFP preform as an embedded fabrication frame for CFW. This eliminates the complex, expensive, and rigid molds that are traditionally associated with composites. Through a bottom-up iterative method, material and structure are explored in an integrative design process. This culminates in a lightweight FlexFlax Stool design (ca. 1 kg), which can carry approximately 80 times its weight, articulated in a new material-based design tectonic.", "language" : "eng", "doi" : "10.3390/app10093278", "bibtexKey": "costalongamartins2020flexflax" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/29fa32fdbc6429900820d9a550952ad85/petraheim", "tags" : [ "2010","advanced","diss","dissertation","engineering","forschungsbericht","grid","hwang","investigation","itke","shell","spatial","structure" ], "intraHash" : "9fa32fdbc6429900820d9a550952ad85", "interHash" : "d0b08347c5da29bf15f973866384be2f", "label" : "Advanced Investigations of Grid Spatial Structures", "user" : "petraheim", "description" : "", "date" : "2020-06-24 14:07:20", "changeDate" : "2021-07-01 13:01:14", "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": "2010", "url": "", "author": [ "Kyung-Ju Hwang" ], "authors": [ {"first" : "Kyung-Ju", "last" : "Hwang"} ], "editor": [ "Jan Knippers" ], "editors": [ {"first" : "Jan", "last" : "Knippers"} ], "volume": "31","abstract": "Free-form grid spatial structures and facades that follow the envelope surface of a complex-shaped skin, such as the DZ-Bank in Berlin (Frank 0. Gehry), the British Museum in London (Norman Foster), the My Zeil in Frankfurt (Massimiliano Fuksas), have become a very interesting issue in modern architecture. There are several important factors in such single layer lattice dome and complex-shaped spatial structures, for instance, optimal form finding and strong material strength and so forth, but the optimal design and analysis of connection are significant points in free-form spatial structures, because such extraordinary geometries and its continuously changing curvature can be defined by the angles of the connections' geometries, and the stiffness of connection can determine the stability of the whole free-form structure. Therefore, it is very important to recognize that the appropriate analysis and connection design have to be performed, in order to design the reasonable global single layer spatial structure and free-form spatial structures.\r\nGeneral procedures\r\nFor the FEA of four connection systems, bending stiffness (My and Mz) and axial force (F) tests were performed. These analyses include the modeling of the bolt assembly, the contact stiffness and the influence of bolt clearances, which were considered using two parameters, such that D..V=0.1 mm and 2.0mm. Due to a specific function of COMBIN39 in ANSYS, the moment-rotation behaviors and load-displacement curves could be transferred to nonlinear spring elements in global grid shells with 25 m and 50 m span that have three different rise-span ratios (0.1, 0.2 and 0.3), to realize the non linear characteristics of the connection systems.\r\n\r\nResults\r\nConnection system having two shear planes showed higher stiffness than those with one shear plane. On the other hand, node connectors with one shear plane were not as influenced by differing bolt-holes as those with two shear planes due to shape-of-joint behaviour. Secondly, the low connection stiffness with initial geometrical imperfection easily leads membrane stress to bending stress, so that the critical point of the grid shell occurred with low load failure factor. The influence of bolt clearance depends mainly on the node stiffness and rise-span ratio. The overall structural behavior of an imperfect high-rise grid shell can be very sensitive, displaying a large deviation of bending stiffness due to bolt clearances.", "isbn" : "978-3-922302-31-5", "language" : "eng", "bibtexKey": "hwang2010advanced" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2d35b05e892ce0e5900ecd468eca4b14a/petraheim", "tags" : [ "2009","connecting","connection","development","engineering","hwang","itke","knippers","node","park","spatial","structure","system" ], "intraHash" : "d35b05e892ce0e5900ecd468eca4b14a", "interHash" : "24170be47d84c3166e3dbc2444aa8889", "label" : "Development of node connecting systems used for spatial structures", "user" : "petraheim", "description" : "", "date" : "2020-05-15 15:58:32", "changeDate" : "2020-05-22 12:24:43", "count" : 2, "pub-type": "inproceedings", "booktitle": "Conference proceeding of the 9th Asian Pacific Conference on Shell and Spatial Structures (APCS2009)","address":"Nagoya Japan", "year": "2009", "url": "", "author": [ "Don-U Park","Jan Knippers","Kyung-Ju Hwang" ], "authors": [ {"first" : "Don-U", "last" : "Park"}, {"first" : "Jan", "last" : "Knippers"}, {"first" : "Kyung-Ju", "last" : "Hwang"} ], "pages": "31", "language" : "eng", "bibtexKey": "park2009development" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/25bc8cb5cb84ec51f6a7eb70facbcd3a5/petraheim", "tags" : [ "2009","application","architecture","engineering","exhibition","gfrp","itke","jointing","knippers","membrane","method","park","spatial","structure" ], "intraHash" : "5bc8cb5cb84ec51f6a7eb70facbcd3a5", "interHash" : "9354474e790f3f6765d6c73b7d0a0ef0", "label" : "Application of a new GFRP jointing method for an exhibition membrane spatial structure", "user" : "petraheim", "description" : "", "date" : "2020-05-15 15:53:17", "changeDate" : "2020-05-22 12:24:43", "count" : 2, "pub-type": "inproceedings", "booktitle": "Conference proceeding of the 9th Asian Pacific Conference on Shell and Spatial Structures (APCS2009)","address":"Nagoya Japan", "year": "2009", "url": "", "author": [ "Don-U Park","Jan Knippers" ], "authors": [ {"first" : "Don-U", "last" : "Park"}, {"first" : "Jan", "last" : "Knippers"} ], "pages": "147 \u2013 148", "language" : "eng", "bibtexKey": "park2009application" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2a921e5861be9d219b51b0ce0c2cacc5e/petraheim", "tags" : [ "2013","architecture","biomimetic","complex","design","fabrication","gabler","itke","knippers","magna","menges","nature","principles","production","reichert","robotic","schwinn","spatial","structure","waimer" ], "intraHash" : "a921e5861be9d219b51b0ce0c2cacc5e", "interHash" : "7692ae81e14474915a39c6fc6bf21cb6", "label" : "From Nature to Fabrication: Biomimetic Design Principles for the Production of Complex Spatial Structures", "user" : "petraheim", "description" : "", "date" : "2020-05-13 16:07:51", "changeDate" : "2020-08-03 10:50:28", "count" : 3, "pub-type": "article", "journal": "International Journal of Space Structures", "year": "2013", "url": "", "author": [ "Riccardo La Magna","Markus Gabler","Frédéric Waimer","Achim Menges","Steffen Reichert","Tobias Schwinn","Jan Knippers" ], "authors": [ {"first" : "Riccardo", "last" : "La Magna"}, {"first" : "Markus", "last" : "Gabler"}, {"first" : "Frédéric", "last" : "Waimer"}, {"first" : "Achim", "last" : "Menges"}, {"first" : "Steffen", "last" : "Reichert"}, {"first" : "Tobias", "last" : "Schwinn"}, {"first" : "Jan", "last" : "Knippers"} ], "volume": "Vol. 28","number": "No. 1","pages": "27 \u2013 39","abstract": "In the current paper the authors present a biomimetic design methodology based on the analysis of the Echinoids (sea urchin and sand dollar) and the transfer of its structural morphology into a built full-scale prototype.\r\nIn the first part, an efficient wood jointing technique for planar sheets of wood through novel robotically fabricated finger-joints is introduced together with an investigation of the biological principles of plate structures and their mechanical features. Subsequently, the identified structural principles are translated and verified with the aid of a Finite Element Model, as well as a generative design system incorporating the rules and constraints of fabrication. The paper concludes with the presentation of a full-scale biomimetic prototype which integrates these morphological and mechanical principles to achieve an efficient and high-performing lightweight structure.", "language" : "eng", "bibtexKey": "knippers2013nature" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/24cf968b2a2a60b1f5b3e6ef6a7e2cdaf/petraheim", "tags" : [ "2007","analysis","coneector","engineering","fre-form","hwang","itke","knippers","node","numerical","park","peer-reviewed","spatial","structur" ], "intraHash" : "4cf968b2a2a60b1f5b3e6ef6a7e2cdaf", "interHash" : "470a87361328b368e268e9b06576b0e6", "label" : "Investigation and Numerical Analysis of Node Connectors in Free-Form Spatial Structures", "user" : "petraheim", "description" : "", "date" : "2020-05-11 18:43:30", "changeDate" : "2020-07-01 11:16:24", "count" : 2, "pub-type": "article", "journal": "Journal of the Korean Association for Spatial Structures", "year": "2007", "url": "", "author": [ "Kyung-Ju Hwang","Don-U Park","Sun-Woo Park","Jan Knippers" ], "authors": [ {"first" : "Kyung-Ju", "last" : "Hwang"}, {"first" : "Don-U", "last" : "Park"}, {"first" : "Sun-Woo", "last" : "Park"}, {"first" : "Jan", "last" : "Knippers"} ], "editor": [ "Korean Association for Spatial Structures (KASS)" ], "editors": [ {"first" : "Korean Association", "last" : "for Spatial Structures (KASS)"} ], "volume": "7","number": "3","pages": "87 \u2013 95","abstract": "The recent completions of free-form spatial structures provide us a very attractive form. To realize such an extraordinary shape, it is absolutely necessary that the connector systems have to be investigated the characteristics of the systems and analyzed with a practicable method. In this context, this research consists of not only literature research but also numerical analysis with selected connector systems, which was adopted in real free-form spatial structures. For numerical analysis, especially, finite element analysis (FEA) is performed with a various test parameter using a commercial program ANSYS. Consequently, the general characteristics of node connectors the moment-rotation-curves are presented by considering a large deformation effect as well as a multi-linear material properties.", "language" : "eng", "bibtexKey": "hwng2007investigation" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/23f6307d69d1a0e19ccb799e98e63c06c/petraheim", "tags" : [ "2012","architecture","biomimetic","bionik","design","fabrication","gabler","itke","knippers","magna","menges","nature","reichert","schwinn","spatial","structures","waimer" ], "intraHash" : "3f6307d69d1a0e19ccb799e98e63c06c", "interHash" : "94fc7fb0057e0a0e80d0423fddecd942", "label" : "From Nature to Fabrication: Biomimetic Design Principles for the Production of Complex Spatial Structures", "user" : "petraheim", "description" : "", "date" : "2020-05-09 11:01:39", "changeDate" : "2020-06-02 10:27:39", "count" : 3, "pub-type": "inbook", "booktitle": "Advances in Architectural Geometry 2012","publisher":"Springer","address":"Wien, New York", "year": "2012", "url": "", "author": [ "Jan Knippers","Achim Menges","Markus Gabler","Riccardo La Magna","Fédéric Waimer","Steffen Reichert","Tobias Schwinn" ], "authors": [ {"first" : "Jan", "last" : "Knippers"}, {"first" : "Achim", "last" : "Menges"}, {"first" : "Markus", "last" : "Gabler"}, {"first" : "Riccardo", "last" : "La Magna"}, {"first" : "Fédéric", "last" : "Waimer"}, {"first" : "Steffen", "last" : "Reichert"}, {"first" : "Tobias", "last" : "Schwinn"} ], "editor": [ " Hesselgren"," Sharma"," Wallner"," Baldassini" ], "editors": [ {"first" : "", "last" : "Hesselgren"}, {"first" : "", "last" : "Sharma"}, {"first" : "", "last" : "Wallner"}, {"first" : "", "last" : "Baldassini"} ], "pages": "107 \u2013 122", "isbn" : "978-3709112502", "language" : "eng", "bibtexKey": "knippers2012nature" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2b34017bf6159c22a69d72dde60b61a6c/petraheim", "tags" : [ "2013","ahlquist","itke","knippers","lienhard","material","menges","spatial","structure","textile","textile-hybrid" ], "intraHash" : "b34017bf6159c22a69d72dde60b61a6c", "interHash" : "4176f39a97d1338cef80cf2d0503ee31", "label" : "Exploring Materials Reciprocities for Textile-Hybrid Systems as Spatial Structures", "user" : "petraheim", "description" : "", "date" : "2020-05-08 14:35:44", "changeDate" : "2020-06-02 10:27:39", "count" : 3, "pub-type": "inbook", "booktitle": "Prototyping Architecture: The Conference Papers","publisher":"Riverside Architectural Press","address":"Toronto", "year": "2013", "url": "", "author": [ "Sean Ahlquist","Julian Lienhard","Jan Knippers","Achim Menges" ], "authors": [ {"first" : "Sean", "last" : "Ahlquist"}, {"first" : "Julian", "last" : "Lienhard"}, {"first" : "Jan", "last" : "Knippers"}, {"first" : "Achim", "last" : "Menges"} ], "editor": [ "Michael Stacey" ], "editors": [ {"first" : "Michael", "last" : "Stacey"} ], "pages": "187 \u2013 210", "isbn" : "9781926724379", "bibtexKey": "ahlquist2013exploring" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/273a468723e5bb0b498933021954cd532/petraheim", "tags" : [ "2012","architecture","biomimetic","bionik","eichert","fabrication","gabler","itke","knippers","magna","menges","nature","schwinn","spatial","structures","waimer" ], "intraHash" : "73a468723e5bb0b498933021954cd532", "interHash" : "cda7fd9a77e60130d3f46c149eeb9a2d", "label" : "From Nature to Fabrication: Biomimetic Design Principles for the Production of Complex Spatial Structures", "user" : "petraheim", "description" : "", "date" : "2020-05-07 13:11:36", "changeDate" : "2020-06-02 10:05:24", "count" : 4, "pub-type": "inproceedings", "booktitle": "Advances in Architectural Geometry 2012","publisher":"Springer","address":"Wien New York", "year": "2012", "url": "", "author": [ "Jan Knippers","Achim Menges","Markus Gabler","Riccardo La Magna","Frédéric Waimer","Steffen Reichert","Tobias Schwinn" ], "authors": [ {"first" : "Jan", "last" : "Knippers"}, {"first" : "Achim", "last" : "Menges"}, {"first" : "Markus", "last" : "Gabler"}, {"first" : "Riccardo", "last" : "La Magna"}, {"first" : "Frédéric", "last" : "Waimer"}, {"first" : "Steffen", "last" : "Reichert"}, {"first" : "Tobias", "last" : "Schwinn"} ], "editor": [ "L. Hesselgren","S. Sharma","J. Wallner","N. Baldassini","P. Bompas","J. Raynaud" ], "editors": [ {"first" : "L.", "last" : "Hesselgren"}, {"first" : "S.", "last" : "Sharma"}, {"first" : "J.", "last" : "Wallner"}, {"first" : "N.", "last" : "Baldassini"}, {"first" : "P.", "last" : "Bompas"}, {"first" : "J.", "last" : "Raynaud"} ], "pages": "107--122", "file" : ":C$\\backslash$:/Users/localicdtschw/Documents/Mendeley Desktop/Knippers et al/Advances in Architectural Geometry 2012/Knippers et al. - 2012 - From Nature to Fabrication Biomimetic Design Principles for the Production of Complex Spatial Structures.pdf:pdf", "isbn" : "ISBN 978-3-7091-1250-2", "bibtexKey": "Knippers2012" } ] }