{ "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/2e39c9adfa6bcd8d879838c703e1fc9ce/hansjakobwagner", "tags" : [ "inproceedings","myown","peer","rp3","timber","wood" ], "intraHash" : "e39c9adfa6bcd8d879838c703e1fc9ce", "interHash" : "97de608d8d80008610c6ad52a7742ad8", "label" : "Concept to Construction: Co-design and Integrative Development Processes for the IntCDC Multi-Story Timber Building System", "user" : "hansjakobwagner", "description" : "", "date" : "2026-01-19 00:04:57", "changeDate" : "2026-01-19 00:04:57", "count" : 4, "pub-type": "inproceedings", "booktitle": "Proceedings of the World Conference on Timber Engineering 2025 (WCTE)","publisher":"World Conference on Timber Engineering 2025", "year": "2025", "url": "https://www.proceedings.com/080513-0012.html", "author": [ "Simon Treml","Lorenz Riedel","Hans Jakob Wagner","Cristóbal Tapia","Simon Aicher","Jan Knippers","Achim Menges" ], "authors": [ {"first" : "Simon", "last" : "Treml"}, {"first" : "Lorenz", "last" : "Riedel"}, {"first" : "Hans Jakob", "last" : "Wagner"}, {"first" : "Cristóbal", "last" : "Tapia"}, {"first" : "Simon", "last" : "Aicher"}, {"first" : "Jan", "last" : "Knippers"}, {"first" : "Achim", "last" : "Menges"} ], "pages": "90-99","abstract": "In the context of the climate crisis and increasing urbanization, there is an urgent necessity to expand the typological possibilities in timber construction. Wide-span, point-supported timber systems for multi-story buildings offer the potential to substitute COၷ-intensive construction materials such as concrete and steel, utilize buildings as carbon sinks, and provide additional qualitative living and working spaces in urban areas. The development and incremental refinement of bespoke systems from initial conceptualization to technical feasibility and regulatory approval require the integration and coordination of comprehensive expert knowledge. A highly integrative approach and interdisciplinary exchange of expert knowledge within the research team, as well as iterative and reciprocal expert knowledge exchange with innovative stakeholders from the construction industry, are imperative. This paper presents the development of a co\u0002design framework for the IntCDC Multi-Story Timber Building System (MSTBS), which facilitates reciprocal and iterative knowledge exchange within the interdisciplinary core research team, as well as between researchers and stakeholders from the construction industry. The research demonstrates how an organizational co-design framework fosters the methodical collaboration between research and industry partners and enables the development of a novel timber building system, contributing to the transition towards more sustainable building practices.", "venue" : "Brisbane, Australia", "isbn" : "9798331320904", "language" : "eng", "eventdate" : "2025-06-22/2025-06-26", "eventtitle" : "14th World Conference on Timber Engineering 2025 (WCTE 2025)", "doi" : "https://doi.org/10.52202/080513-0012", "bibtexKey": "treml2025concept" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2d6c3238bae384d8976b7585e362482d0/streml", "tags" : [ "fibre","inproceedings","itech","myown","peer","timber" ], "intraHash" : "d6c3238bae384d8976b7585e362482d0", "interHash" : "abf7719c556f6f9b7d0ea7af404f7b15", "label" : "Controlled Anisotropy : A Design-to-Assembly Method for Resource-Efficient Timber Structures with Fibrous Joints", "user" : "streml", "description" : "", "date" : "2025-10-29 14:38:43", "changeDate" : "2025-10-29 14:58:44", "count" : 5, "pub-type": "inproceedings", "booktitle": "Proceedings of the 44th Annual Conference of the Association for Computer Aided Design in Architecture (ACADIA 2024): Designing Change","publisher":"Association for Computer Aided Design in Architecture (ACADIA)", "year": "2024", "url": "https://papers.cumincad.org/data/works/att/acadia24_v2_59.pdf", "author": [ "Tzu-Ying Chen","Simon Treml","Lior Skoury","Jorge A. Christie Remy-Maillet","Hans Jakob Wagner","Achim Menges","Jan Knippers" ], "authors": [ {"first" : "Tzu-Ying", "last" : "Chen"}, {"first" : "Simon", "last" : "Treml"}, {"first" : "Lior", "last" : "Skoury"}, {"first" : "Jorge A. Christie", "last" : "Remy-Maillet"}, {"first" : "Hans Jakob", "last" : "Wagner"}, {"first" : "Achim", "last" : "Menges"}, {"first" : "Jan", "last" : "Knippers"} ], "volume": "1","pages": "253-264","note": "Tzu-Ying Chen and Simon Treml contributed equally as first authors.","abstract": "This paper presents a novel design-to-assembly method that enables resource-efficient branching timber structures. We introduce a bio-based material system that employs anisotropy-driven design and fabrication strategies alongside a computational design tool for structurally-informed design explorations. Particular attention is directed to connections between timber components, where deviations between the direction of force flow and the fiber orientation in the wood are present, which are recognized as structural weak points. This research investigates how anisotropic nodes can enhance force transfer between individual timber elements, thus allowing for load-adapted, slender component cross-sections. Maintaining precise control over anisotropy represents the pivotal strategy for developing a bio-based, material- and resource-efficient building system. Furthermore, we demonstrate how the concurrent development of a material system, fabrication methods, and an assembly strategy, in conjunction with the development of a computational framework, yields a building system with a distinctive, material-driven aesthetic. The strength of the proposed material system and fabrication strategies are assessed in small-scale tests of three-valent planar nodes and four-valent spatial nodes. Additionally, the scalability and flexibility of a custom-developed design tool, fabrication processes, and assembly strategy are evaluated through a 1:1 demonstrator of a load-bearing, branching structure.", "venue" : "Calgary, Canada and Banff, Canada", "isbn" : "979-8-9891764-7-2", "language" : "eng", "eventdate" : "2024-11-14/2024-11-16", "eventtitle" : "Acadia 2024: Designing Change", "doi" : "10.52842/conf.acadia.2024.2.253", "bibtexKey": "chen2024controlled" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2e39c9adfa6bcd8d879838c703e1fc9ce/streml", "tags" : [ "inproceedings","myown","peer","rp3","timber" ], "intraHash" : "e39c9adfa6bcd8d879838c703e1fc9ce", "interHash" : "97de608d8d80008610c6ad52a7742ad8", "label" : "Concept to Construction: Co-design and Integrative Development Processes for the IntCDC Multi-Story Timber Building System", "user" : "streml", "description" : "", "date" : "2025-10-29 13:45:34", "changeDate" : "2025-10-29 14:07:13", "count" : 4, "pub-type": "inproceedings", "booktitle": "Proceedings of the World Conference on Timber Engineering 2025 (WCTE)","publisher":"World Conference on Timber Engineering 2025", "year": "2025", "url": "https://www.proceedings.com/080513-0012.html", "author": [ "Simon Treml","Lorenz Riedel","Hans Jakob Wagner","Cristóbal Tapia","Simon Aicher","Jan Knippers","Achim Menges" ], "authors": [ {"first" : "Simon", "last" : "Treml"}, {"first" : "Lorenz", "last" : "Riedel"}, {"first" : "Hans Jakob", "last" : "Wagner"}, {"first" : "Cristóbal", "last" : "Tapia"}, {"first" : "Simon", "last" : "Aicher"}, {"first" : "Jan", "last" : "Knippers"}, {"first" : "Achim", "last" : "Menges"} ], "pages": "90-99","abstract": "In the context of the climate crisis and increasing urbanization, there is an urgent necessity to expand the typological possibilities in timber construction. Wide-span, point-supported timber systems for multi-story buildings offer the potential to substitute COၷ-intensive construction materials such as concrete and steel, utilize buildings as carbon sinks, and provide additional qualitative living and working spaces in urban areas. The development and incremental refinement of bespoke systems from initial conceptualization to technical feasibility and regulatory approval require the integration and coordination of comprehensive expert knowledge. A highly integrative approach and interdisciplinary exchange of expert knowledge within the research team, as well as iterative and reciprocal expert knowledge exchange with innovative stakeholders from the construction industry, are imperative. This paper presents the development of a co\u0002design framework for the IntCDC Multi-Story Timber Building System (MSTBS), which facilitates reciprocal and iterative knowledge exchange within the interdisciplinary core research team, as well as between researchers and stakeholders from the construction industry. The research demonstrates how an organizational co-design framework fosters the methodical collaboration between research and industry partners and enables the development of a novel timber building system, contributing to the transition towards more sustainable building practices.", "venue" : "Brisbane, Australia", "isbn" : "9798331320904", "language" : "eng", "eventdate" : "2025-06-22/2025-06-26", "eventtitle" : "14th World Conference on Timber Engineering 2025 (WCTE 2025)", "doi" : "https://doi.org/10.52202/080513-0012", "bibtexKey": "treml2025concept" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2c3ad86e5200f372f7e0686bcba1ef7b0/mjbosch", "tags" : [ "@iktd_group","@sfb1244","AT","IKTD","ILEK","INPROCEEDINGS","PUK","myown","sfb1244_c02" ], "intraHash" : "c3ad86e5200f372f7e0686bcba1ef7b0", "interHash" : "28094d124ddcaf153b0f4342ab99d25d", "label" : "Designing a framework for actuators for adaptive structures", "user" : "mjbosch", "description" : "", "date" : "2024-05-27 08:54:11", "changeDate" : "2024-05-27 08:54:11", "count" : 4, "pub-type": "inproceedings", "booktitle": "Proceedings of the Design Society: International Design Conference - DESIGN 2024","publisher":"Cambridge University Press", "year": "2024", "url": "https://doi.org/10.1017/pds.2024.54", "author": [ "Matthias J. Bosch","Markus Nitzlader","Matthias Bachmann","Hansgeorg Binz","Lucio Blandini","Matthias Kreimeyer" ], "authors": [ {"first" : "Matthias J.", "last" : "Bosch"}, {"first" : "Markus", "last" : "Nitzlader"}, {"first" : "Matthias", "last" : "Bachmann"}, {"first" : "Hansgeorg", "last" : "Binz"}, {"first" : "Lucio", "last" : "Blandini"}, {"first" : "Matthias", "last" : "Kreimeyer"} ], "volume": "4","pages": "513-522","abstract": "Adaptive structures have the potential to play a significant role in saving resources in the construction industry in the future. For realisation, this requires actuators that meet the requirements of different buildings with their specific load-bearing structures. In the past, the actuators were mainly developed particularly for one exemplary load-bearing structure. This paper analyses the primary classifications for buildings, followed by challenges of adaptive structures, before outlining the draft of a framework for actuators for adaptive structures to speed up and simplify development.", "language" : "English", "eventdate" : "20.-23.05.2024", "eventtitle" : "International Design Conference - DESIGN 2024", "doi" : "10.1017/pds.2024.54", "bibtexKey": "bosch2024designing" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2c3ad86e5200f372f7e0686bcba1ef7b0/sfb1244", "tags" : [ "myown","PUK","@iktd_group","ILEK","INPROCEEDINGS","@sfb1244","AT","IKTD","sfb1244_c02" ], "intraHash" : "c3ad86e5200f372f7e0686bcba1ef7b0", "interHash" : "28094d124ddcaf153b0f4342ab99d25d", "label" : "Designing a framework for actuators for adaptive structures", "user" : "sfb1244", "description" : "", "date" : "2024-05-27 08:54:11", "changeDate" : "2024-05-27 08:54:11", "count" : 4, "pub-type": "inproceedings", "booktitle": "Proceedings of the Design Society: International Design Conference - DESIGN 2024","publisher":"Cambridge University Press", "year": "2024", "url": "https://doi.org/10.1017/pds.2024.54", "author": [ "Matthias J. Bosch","Markus Nitzlader","Matthias Bachmann","Hansgeorg Binz","Lucio Blandini","Matthias Kreimeyer" ], "authors": [ {"first" : "Matthias J.", "last" : "Bosch"}, {"first" : "Markus", "last" : "Nitzlader"}, {"first" : "Matthias", "last" : "Bachmann"}, {"first" : "Hansgeorg", "last" : "Binz"}, {"first" : "Lucio", "last" : "Blandini"}, {"first" : "Matthias", "last" : "Kreimeyer"} ], "volume": "4","pages": "513-522","abstract": "Adaptive structures have the potential to play a significant role in saving resources in the construction industry in the future. For realisation, this requires actuators that meet the requirements of different buildings with their specific load-bearing structures. In the past, the actuators were mainly developed particularly for one exemplary load-bearing structure. This paper analyses the primary classifications for buildings, followed by challenges of adaptive structures, before outlining the draft of a framework for actuators for adaptive structures to speed up and simplify development.", "language" : "English", "eventdate" : "20.-23.05.2024", "eventtitle" : "International Design Conference - DESIGN 2024", "doi" : "10.1017/pds.2024.54", "bibtexKey": "bosch2024designing" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2ebfffceee077b4bf9a9e8411584a7614/ibb-publication", "tags" : [ "SFB1244_A04","SFB1244_B01","SFB1244_B03","ibb","inproceedings" ], "intraHash" : "ebfffceee077b4bf9a9e8411584a7614", "interHash" : "db39046cf4faa68b017c7da285498abf", "label" : "Optimal Design of Adaptive Structures vs. Optimal Adaption of Structural Design", "user" : "ibb-publication", "description" : "", "date" : "2021-04-20 08:29:07", "changeDate" : "2022-07-13 07:31:03", "count" : 4, "pub-type": "inproceedings", "journal": "IFAC-PapersOnLine","publisher":"IFAC World Congress 2020, 11.-17.07.2020, Berlin, Germany", "year": "2020", "url": "", "author": [ "Florian Geiger","Jan Gade","Malte von Scheven","Manfred Bischoff" ], "authors": [ {"first" : "Florian", "last" : "Geiger"}, {"first" : "Jan", "last" : "Gade"}, {"first" : "Malte", "last" : "von Scheven"}, {"first" : "Manfred", "last" : "Bischoff"} ], "volume": "53","number": "2","pages": "8363--8369","abstract": "Taking advantage of adaptivity in the field of civil engineering is an ongoing research topic. Integration of adaptive elements in the load-bearing structure is already well established in many other engineering fields. First investigations promise large material saving potentials also in the field of civil engineering, especially when it comes to high-rise buildings or wide spanned structures like roofs or bridges. In times of emission problems and shortage of materials, the potentials of adaptive civil structures open various new possibilities.\r\n\r\nIn the design and optimization process of adaptive civil structures, we address the differences between classical approaches for passive systems and new practices considering adaptivity. By using a suitable actuator placement, it is possible to manipulate the displacements of the structure as well as the force distribution within the structure. Both material and energy savings can be accomplished with an integrated design of the adaptive structure taking into account the actuation, suitable combination of structural design and actuator placement. For demonstration of the differences in the design process and in the resulting optimized structure, we use a small case study on a truss structure, which is inspired by a high-rise building, and consider static loads.", "doi" : "10.1016/j.ifacol.2020.12.1604", "bibtexKey": "geiger2020optimal" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2ea9b88ed0e23753df40ff08c7f3bdfc5/ibb-publication", "tags" : [ "from:maltevonscheven","ibb","inproceedings" ], "intraHash" : "ea9b88ed0e23753df40ff08c7f3bdfc5", "interHash" : "0157a69a6989514204f18f278f174151", "label" : "Advanced approaches for analysis and form finding of membrane structures with finite elements, Part I: Comparison of a microstructural model with an anisotropically hyperelastic model gained by inverse problems of parameter identification", "user" : "ibb-publication", "description" : "", "date" : "2021-03-10 12:17:29", "changeDate" : "2022-02-08 17:06:27", "count" : 3, "pub-type": "inproceedings", "booktitle": "K. Bletzinger, E. Onate, B. Kröplin (Eds.) Proceedings of VIII International Conference on Textile Composites and Inflatable Structures (STRUCTURAL MEMBRANES 2017), 9-11 October 2017. Munich, Germany", "year": "2017", "url": "", "author": [ "Jan Gade","Manfred Bischoff","Roman Kemmler" ], "authors": [ {"first" : "Jan", "last" : "Gade"}, {"first" : "Manfred", "last" : "Bischoff"}, {"first" : "Roman", "last" : "Kemmler"} ], "abstract": "Part I deals with material modelling of woven fabric membranes. Due to their structure of crossed yarns embedded in coating, woven fabric membranes are characterised by a highly nonlinear stress-strain behaviour. In order to determine an accurate structural response of membrane structures, a suitable description of the material behaviour is required. A linear elastic orthotropic model approach, which is current practice, only allows a relative coarse approximation of the material behaviour. The present work focuses on two different material approaches: A first approach becomes evident by focusing on the meso-scale. The inhomogeneous, however periodic structure of woven fabrics motivates for microstructural modelling. An established microstructural model is considered and enhanced with regard to the coating stiffness. Secondly, an anisotropic hyperelastic material model for woven fabric membranes is considered. By performing inverse processes of parameter identification, fits of the two different material models w.r.t. measured data from a common biaxial test are shown. The results of the inversely parametrised material models are compared and discussed.", "bibtexKey": "gade2020advanced" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/241866a1954e535adf9e1744aca2fae31/ibb-publication", "tags" : [ "from:maltevonscheven","inproceedings" ], "intraHash" : "41866a1954e535adf9e1744aca2fae31", "interHash" : "a40f0111776045c080ee09038f2c8357", "label" : "Erweiterte Ansätze zur Formfindung und Analyse von Membrantragwerken, Teil I: Parameteridentifikation eines Mikrostrukturmodells für Gewebemembranmaterialien durch Lösung eines inversen Problems", "user" : "ibb-publication", "description" : "", "date" : "2021-03-10 12:16:31", "changeDate" : "2021-03-10 11:22:44", "count" : 3, "pub-type": "inproceedings", "booktitle": "G. Meschke et al. (Hrsg.) Berichte der Fachtagung Baustatik \u2013 Baupraxis 13, 20. und 21. März 2017, Bochum", "year": "2017", "url": "", "author": [ "Roman Kemmler","Jan Gade" ], "authors": [ {"first" : "Roman", "last" : "Kemmler"}, {"first" : "Jan", "last" : "Gade"} ], "abstract": "Teil I thematisiert die Materialmodellierung von Gewebewerkstoffen. Gewebemembranen weisen aufgrund ihres herstellungsbedingten Aufbaus aus gekreuzten Fäden, die in eine schützende Beschichtung eingebettet sind, ein ausgeprägt nichtlineares Spannungs-Dehnungsverhalten auf. Mit üblicherweise verwendeten phänomenologischen Materialmodellen, wie linear-elastischen, orthotropen Modellen, kann das komplexe Verformungsverhalten lediglich stark vereinfacht abgebildet werden. Eine adäquatere Modellbildung gelingt stattdessen unter Heranziehung des strukturierten Aufbaus von Geweben auf der Mesoebene. Im Rahmen des vorliegenden Beitrags wird ein bereits in der Literatur verwendetes Mikrostrukturmodell herangezogen, erweitert und mittels Lösung eines inversen Problems der Parameteridentifikation auf Messdaten eines biaxialen Zugversuchs angepasst.", "bibtexKey": "kemmler2017erweiterte" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/20762bfea9e0f805b5c1b907f665e617d/ibb-publication", "tags" : [ "MoDe","ibb","from:maltevonscheven","inproceedings" ], "intraHash" : "0762bfea9e0f805b5c1b907f665e617d", "interHash" : "519b45b37307c614da8f52ac61176b46", "label" : "Self-shaping Curved Folding:: A 4D-printing method for fabrication of self-folding curved crease structures", "user" : "ibb-publication", "description" : "", "date" : "2021-03-09 13:41:01", "changeDate" : "2021-03-09 12:41:01", "count" : 3, "pub-type": "inproceedings", "booktitle": "Proceedings of SCF '20: Symposium on Computational Fabrication, November 2020", "year": "2020", "url": "", "author": [ "Yasaman Tahouni","Tiffany Cheng","Dylan Wood","Renate Sachse","Rebecca Thierer","Manfred Bischoff","Achim Menges" ], "authors": [ {"first" : "Yasaman", "last" : "Tahouni"}, {"first" : "Tiffany", "last" : "Cheng"}, {"first" : "Dylan", "last" : "Wood"}, {"first" : "Renate", "last" : "Sachse"}, {"first" : "Rebecca", "last" : "Thierer"}, {"first" : "Manfred", "last" : "Bischoff"}, {"first" : "Achim", "last" : "Menges"} ], "abstract": "Curved folding, a method to create curved 3D structures from a flat sheet, can be used to produce material and manufacturing efficient, static or dynamic structures. However, the complex assembly and folding sequence of curved crease patterns is the bottleneck in their fabrication process. This paper presents Self-shaping Curved Folding: a material programming approach to create curved crease origami structures that self-assemble from flat into 3D folded state upon exposure to external stimuli. We propose a digital fabrication process via the 3D-printing of shape-changing materials, accompanied by a computational design workflow in which the geometry of a crease pattern is correlated with the printing toolpaths and the layup of stimuli-responsive and passive materials to achieve a target shape-change. We demonstrate our method by producing multiple prototypes and documenting their shape-change upon actuation. Lastly, we explore the functional and performance benefits of self-shaping curved folding under three application scenarios relevant to the field of industrial design and architecture.", "doi" : "10.1145/3424630.3425416", "bibtexKey": "tahouni2020selfshaping" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/26dd536e53774d6b29c8fa992a98167f9/ibb-publication", "tags" : [ "ibb","from:maltevonscheven","Tetra","inproceedings" ], "intraHash" : "6dd536e53774d6b29c8fa992a98167f9", "interHash" : "809931f8761c7148f0d90ed5fc06b1d9", "label" : "Time step estimates for reciprocal mass matrices using Ostrowski's bounds", "user" : "ibb-publication", "description" : "", "date" : "2021-03-09 13:41:01", "changeDate" : "2021-03-09 12:41:01", "count" : 2, "pub-type": "inproceedings", "booktitle": "Proc. 7th ECCOMAS Thematic Conference on Computational Methods in Structural Dynamics and Earthquake Engineering, M. Papadrakakis and M. Fragiadakakis (eds.), Crete, Greece, June 24-26. 2019", "year": "2019", "url": "", "author": [ "Anton Tkachuk","Radek Kolman","Jose A. Gonzalez","Manfred Bischoff","Jan Kopacka" ], "authors": [ {"first" : "Anton", "last" : "Tkachuk"}, {"first" : "Radek", "last" : "Kolman"}, {"first" : "Jose A.", "last" : "Gonzalez"}, {"first" : "Manfred", "last" : "Bischoff"}, {"first" : "Jan", "last" : "Kopacka"} ], "abstract": "In this contribution, a novel local, node-based time step estimate for reciprocal mass matrices with improved sharpness is proposed. Reciprocal mass matrices are sparse matrices used in explicit dynamics that allow computation of the nodal acceleration from the total force vector. They aim for higher critical time steps or/and accuracy than the lumped mass matrix approximation. Since the eigenvalue inequality by Fried does not hold for reciprocal mass matrices, element-based estimates may be not conservative and are consequently inadequate. Therefore, nodal time step estimates are preferred for reciprocal mass matrices. A nodal time step estimate requires an eigenvalue bound using row or/and column information associated with the nodal degrees of freedom. Recently, an efficient estimate was proposed that uses Gershgorin\u2019s circle theorem and a corresponding bound. This estimate is always conservative but it usually leaves a 10-30% gap to the true eigenvalue. This raises the question whether a sharper estimate may be constructed by using a different eigenvalue bound. A recent paper by Cottereau and Sevilla compares five eigenvalue bounds for a diagonal mass matrix with spectral finite elements and indicates that the Ostrowski\u2019s bound is the sharpest bound for most of the considered cases. In this contribution, the latter estimate is further developed for the case of reciprocal mass matrices and an extra improvement via similarity transformation for elements with rotary degrees of freedom is discussed. Finally, the estimate is tested for a set of common finite elements in explicit dynamics.", "doi" : "10.7712/120119.6956.18956", "bibtexKey": "tkachuk2019estimates" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/271e0a359ad0b61fc5a8c9a5b215a9c8a/ibb-publication", "tags" : [ "TRR141_A07","ibb","from:maltevonscheven","inproceedings" ], "intraHash" : "71e0a359ad0b61fc5a8c9a5b215a9c8a", "interHash" : "e50e0aea6b391a107db1c10166fe4b27", "label" : "Clypeaster under Pressure: Strengthening Structures and Virtual Modulations of an Echinoids Test", "user" : "ibb-publication", "description" : "", "date" : "2021-03-09 13:41:00", "changeDate" : "2021-03-09 12:41:00", "count" : 2, "pub-type": "inproceedings", "booktitle": "Proc of the GSA Annual Meeting in Seattle, Washington, USA", "year": "2017", "url": "", "author": [ "Tobias B. Grun","Malte von Scheven","Manfred Bischoff","James H. Nebelsick" ], "authors": [ {"first" : "Tobias B.", "last" : "Grun"}, {"first" : "Malte", "last" : "von Scheven"}, {"first" : "Manfred", "last" : "Bischoff"}, {"first" : "James H.", "last" : "Nebelsick"} ], "doi" : "10.1130/abs/2017AM-293682", "bibtexKey": "grun2017clypeaster" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2a2769674bbb658646a4bfb365d6b77d9/ibb-publication", "tags" : [ "ibb","from:maltevonscheven","inproceedings" ], "intraHash" : "a2769674bbb658646a4bfb365d6b77d9", "interHash" : "046128bd4c0a8931ded0ec7e18fc0d6c", "label" : "A robust explicit finite element algorithm with bipenalty stabilization for contact-impact problems", "user" : "ibb-publication", "description" : "", "date" : "2021-03-09 13:41:00", "changeDate" : "2021-03-09 12:41:00", "count" : 2, "pub-type": "inproceedings", "booktitle": "Proceedings of the 7th GACM Colloquium on Computational Mechanics for Young Sci-entists from Academia and Industry, M. von Scheven, M.-A. Keip and N. Karajan (eds.), Stuttgart, Germany, October 11-13", "year": "2017", "url": "", "author": [ "R. Kolman","J. Kopačka","A. Tkachuk","D. Gabriel","J. González","M. Bischoff" ], "authors": [ {"first" : "R.", "last" : "Kolman"}, {"first" : "J.", "last" : "Kopačka"}, {"first" : "A.", "last" : "Tkachuk"}, {"first" : "D.", "last" : "Gabriel"}, {"first" : "J.", "last" : "González"}, {"first" : "M.", "last" : "Bischoff"} ], "doi" : "10.18419/opus-9334", "bibtexKey": "kolman2017robust" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/20920f0e28b75c2fefb2bd98ef6e9a781/ibb-publication", "tags" : [ "MoDe","ibb","from:maltevonscheven","TRR141_A04","inproceedings" ], "intraHash" : "0920f0e28b75c2fefb2bd98ef6e9a781", "interHash" : "09d83b53f0ba96abd144ffa9235fad69", "label" : "Modeling and analysis of the trapping mechanism of Aldrovanda vesiculosa as biomimetic inspiration for façade elements", "user" : "ibb-publication", "description" : "", "date" : "2021-03-09 13:41:00", "changeDate" : "2021-03-09 12:41:00", "count" : 4, "pub-type": "inproceedings", "booktitle": "Proceedings of the IASS Annual Symposium 2017. Annette Bögle, Manfred Grohmann (eds.) \"Interfaces: architecture.engineering.science\". 25-28th September, 2017, Hamburg, Germany, 2017", "year": "2017", "url": "", "author": [ "Manfred Bischoff","Renate Sachse","Axel Körner","Anna Westermeier","Larissa Born","Simon Poppinga","Götz Gresser","Thomas Speck","Jan Knippers" ], "authors": [ {"first" : "Manfred", "last" : "Bischoff"}, {"first" : "Renate", "last" : "Sachse"}, {"first" : "Axel", "last" : "Körner"}, {"first" : "Anna", "last" : "Westermeier"}, {"first" : "Larissa", "last" : "Born"}, {"first" : "Simon", "last" : "Poppinga"}, {"first" : "Götz", "last" : "Gresser"}, {"first" : "Thomas", "last" : "Speck"}, {"first" : "Jan", "last" : "Knippers"} ], "abstract": "Within the collaborative research center Biological Design and Integrative Structures (CRC TRR 141), a research team of biologists, architects and engineers from Freiburg, Tübingen and Stuttgart is working on the development of biomimetic and bioinspired structures for implementation in architecture and building construction. One of the projects in this research center deals with the kinematics of planar, curved and corrugated plant surfaces as concept generators for deployable systems in architecture. It is an example for methods of engineering science at the interface between biology and architecture.\n\nThe contribution will provide an insight into the process of analyzing the waterwheel plant Aldrovanda vesiculosa, a carnivorous plant that catches its prey by a quick closing movement of a snap trap consisting of two lobes attached to a midrib. At a first glance, the mechanism resembles the one of the famous Venus flytrap; however, it appears to be quite different from a mechanical point of view.\n\nIn fact, a key aspect in the research presented here is the development of mechanical models and performing corresponding finite element analyses of the plant with the aim to obtain a better understanding of the compliant mechanism of Aldrovanda vesiculosa and its actuation. The latter is related to a change in turgor pressure in a so-called motor zone, adjacent to the midrib, possibly combined with prestressing effects. Apart from this scientific contribution to technical biology or reverse biomimetics, the abstraction of the trapping movement and its implementation in a façade element (Flectofold) as an example of biomimetic architectural design are briefly described.", "bibtexKey": "bischoff2017modeling" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2f8d0f2f53bcb2954e3a89a21490439da/ibb-publication", "tags" : [ "ibb","from:maltevonscheven","TRR141_A04","inproceedings" ], "intraHash" : "f8d0f2f53bcb2954e3a89a21490439da", "interHash" : "2d9d79a5f5f6c67bf771934f0c48d1ec", "label" : "Fiber-reinforced plastics with locally adapted stiffness for bio-inspired hingeless, deployable architectural systems", "user" : "ibb-publication", "description" : "", "date" : "2021-03-09 13:41:00", "changeDate" : "2021-03-09 12:41:00", "count" : 2, "pub-type": "inproceedings", "booktitle": "Proceedings of the 21th Symposium on Composites, Bremen, Germany", "year": "2017", "url": "", "author": [ "Larissa Born","Axel Körner","Gundula Schieber","Anna S. Westermeier","Simon Poppinga","Renate Sachse","Paavo Bergmann","Oliver Betz","Manfred Bischoff","Thomas Speck","Jan Knippers","M. Milwich","Götz T. Gresser" ], "authors": [ {"first" : "Larissa", "last" : "Born"}, {"first" : "Axel", "last" : "Körner"}, {"first" : "Gundula", "last" : "Schieber"}, {"first" : "Anna S.", "last" : "Westermeier"}, {"first" : "Simon", "last" : "Poppinga"}, {"first" : "Renate", "last" : "Sachse"}, {"first" : "Paavo", "last" : "Bergmann"}, {"first" : "Oliver", "last" : "Betz"}, {"first" : "Manfred", "last" : "Bischoff"}, {"first" : "Thomas", "last" : "Speck"}, {"first" : "Jan", "last" : "Knippers"}, {"first" : "M.", "last" : "Milwich"}, {"first" : "Götz T.", "last" : "Gresser"} ], "abstract": "This paper presents results of the investigation of two biological role models, the shield bug (Graphosoma italicum) and the carnivorous Waterwheel plant (Aldrovanda vesiculosa). The aim was to identify biological construction and movement principles as inspiration for technical, deployable systems. The subsequent processes of abstraction and simulation of the movement and the design principles are summarized, followed by results on the mechanical investigations on various combinations of fibers and matrices with regard to taking advantage of the anisotropy of fiber-reinforced plastics (FRPs). With the results gained, it was possible to implement defined flexible bending zones in stiff composite components using one composite material, and thereby to mimic the biological role models. First small-scale demonstrators for adaptive façade shading systems \u2013 Flectofold and Flexagon \u2013 are proving the functionality.", "bibtexKey": "born2017fiberreinforced" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2257c6cdaa005c2f6dfffa834968f031c/ibb-publication", "tags" : [ "ibb","from:maltevonscheven","inproceedings" ], "intraHash" : "257c6cdaa005c2f6dfffa834968f031c", "interHash" : "7212f9dffd0ef806b5573c9bfa7a1522", "label" : "Estimation of stability limit based on Gershgorin\u2019s theorem for explicit contact-impact analy-sis Signorini problem using bipenalty approach", "user" : "ibb-publication", "description" : "", "date" : "2021-03-09 13:41:00", "changeDate" : "2021-03-09 12:41:00", "count" : 2, "pub-type": "inproceedings", "booktitle": "Proc. 6th ECCOMAS Thematic Conference on Computational Methods in Structural Dy-namics and Earthquake Engineering, M. Papadrakakis and M. Fragiadakakis (eds.), Rhodes Island, Greece, June 15-17", "year": "2017", "url": "", "author": [ "D. Gabriel","A. Tkachuk","J. Kopačka","R. Kolman","M. Mračko","M. Bischoff","J. Plešek" ], "authors": [ {"first" : "D.", "last" : "Gabriel"}, {"first" : "A.", "last" : "Tkachuk"}, {"first" : "J.", "last" : "Kopačka"}, {"first" : "R.", "last" : "Kolman"}, {"first" : "M.", "last" : "Mračko"}, {"first" : "M.", "last" : "Bischoff"}, {"first" : "J.", "last" : "Plešek"} ], "doi" : "10.7712/120117.5494.18027", "bibtexKey": "gabriel2017estimation" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/259f714bfe4518113f6c6c09c6bf73e3d/ibb-publication", "tags" : [ "IGA_SHELL","ibb","from:maltevonscheven","inproceedings" ], "intraHash" : "59f714bfe4518113f6c6c09c6bf73e3d", "interHash" : "31e7ea16ff4506e189d73558b206dbc6", "label" : "Isogeometric analysis with hierarchic shell elements \u2013 intrinsically free from locking by alternative parametrizations", "user" : "ibb-publication", "description" : "", "date" : "2021-03-09 13:41:00", "changeDate" : "2021-03-09 12:41:00", "count" : 2, "pub-type": "inproceedings", "booktitle": "Proceedings of the IASS Annual Symposium 2017. Annette Bögle, Manfred Grohmann (eds.) \"Interfaces: architecture.engineering.science\". 25-28th September, 2017, Hamburg, Germany", "year": "2017", "url": "", "author": [ "Bastian Oesterle","Renate Sachse","Simon Bieber","Ekkehard Ramm","Manfred Bischoff" ], "authors": [ {"first" : "Bastian", "last" : "Oesterle"}, {"first" : "Renate", "last" : "Sachse"}, {"first" : "Simon", "last" : "Bieber"}, {"first" : "Ekkehard", "last" : "Ramm"}, {"first" : "Manfred", "last" : "Bischoff"} ], "abstract": "The higher inter-element continuity of the Isogeometric Analysis (IGA) applying NURBS functions for geometry as well as mechanics opens up new possibilities in the analysis of thin-walled structures, i.e. beams, plates and shells. An important advantage is the straightforward implementation of classical theories, which require C1-continuity, e. g. Kirchhoff-Love shell formulations. Based on these \"simplest\" models shear deformable theories, introducing Timoshenko and Reissner-Mindlin kinematics, are formulated in a hierarchic manner. In contrast to using total rotations the present formulations introduce incremental transverse shear rotations as primary variables. This reparametrization of the kinematic equations can be established in several different fashions, which is addressed in this contribution. All parametrizations have in common, that they lead to shear deformable beam, plate and shell formulations being intrinsically free from transverse shear locking. This is a remarkable feature since the spectrum of different smooth discretization schemes in IGA and other fields of computational shell analysis is continuously growing and the proposed hierarchic shell formulations are locking-free, independent of the underlying discretization.", "bibtexKey": "oesterle2017isogeometric" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/24da7c08a6f947285c33f25e32fb8f331/ibb-publication", "tags" : [ "ibb","from:maltevonscheven","TRR141_A04","inproceedings" ], "intraHash" : "4da7c08a6f947285c33f25e32fb8f331", "interHash" : "0df99c033f8f23443198b214d0157d5b", "label" : "Keine Gelenkbeschwerden \u2013 Wie Pflanzen sich bewegen und die Technik inspirieren", "user" : "ibb-publication", "description" : "", "date" : "2021-03-09 13:41:00", "changeDate" : "2021-03-09 12:41:00", "count" : 1, "pub-type": "inproceedings", "booktitle": "J. Knippers, U. Schmid & T. Speck (eds.), Baubionik \u2013 Biologie beflügelt Architektur, 30 \u2013 39. Stuttgarter Beiträge zur Naturkunde, Serie C, Band 82, Staatliches Museum für Naturkunde Stuttgart", "year": "2017", "url": "", "author": [ "A. Westermeier","S. Poppinga","A. Körner","L. Born","R. Sachse","S. Saffarian","J. Knippers","M. Bischoff","G. Gresser","T. Speck" ], "authors": [ {"first" : "A.", "last" : "Westermeier"}, {"first" : "S.", "last" : "Poppinga"}, {"first" : "A.", "last" : "Körner"}, {"first" : "L.", "last" : "Born"}, {"first" : "R.", "last" : "Sachse"}, {"first" : "S.", "last" : "Saffarian"}, {"first" : "J.", "last" : "Knippers"}, {"first" : "M.", "last" : "Bischoff"}, {"first" : "G.", "last" : "Gresser"}, {"first" : "T.", "last" : "Speck"} ], "bibtexKey": "westermeier2017keine" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2955a41366d9259a585b4fa6a50ca350b/ibb-publication", "tags" : [ "IGA_Kontakt","ibb","from:maltevonscheven","inproceedings" ], "intraHash" : "955a41366d9259a585b4fa6a50ca350b", "interHash" : "d9fa1dd823aa58966521b31044b4d2b3", "label" : "Singular mass matrices for isogeometric finite element analysis of dynamic contact", "user" : "ibb-publication", "description" : "", "date" : "2021-03-09 13:41:00", "changeDate" : "2021-03-09 12:41:00", "count" : 2, "pub-type": "inproceedings", "booktitle": "Proceedings of the 7th GACM Colloquium on Computational Mechanics for Young Sci-entists from Academia and Industry, M. von Scheven, M.-A. Keip and N. Karajan (eds.), Stuttgart, Germany, October 11-13", "year": "2017", "url": "", "author": [ "A. Tkachuk","Martina E. Matzen","R. Kolman","M. Bischoff" ], "authors": [ {"first" : "A.", "last" : "Tkachuk"}, {"first" : "Martina E.", "last" : "Matzen"}, {"first" : "R.", "last" : "Kolman"}, {"first" : "M.", "last" : "Bischoff"} ], "doi" : "10.18419/opus-9334", "bibtexKey": "tkachuk2017singular" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2435a6ba5525db61de5bdfabac248a2c4/ibb-publication", "tags" : [ "IGA_SHELL","ibb","from:maltevonscheven","inproceedings" ], "intraHash" : "435a6ba5525db61de5bdfabac248a2c4", "interHash" : "8149db04f379ad101af84c92ae8b7c3d", "label" : "Hierarchic isogeometric analyses of beams and shells", "user" : "ibb-publication", "description" : "", "date" : "2021-03-09 13:40:59", "changeDate" : "2021-03-09 12:40:59", "count" : 1, "pub-type": "inproceedings", "booktitle": "M. Kleiber, T. Burczynski, K. Wilde, J. Gorski, K. Winkelmann, L. Smakosz (Eds.) \"Advances in Mechanics: Theoretical, Computational and Interdisciplinary Issues\". Proceedings of the 3rd Polish Congress of Mechanics (PCM) & 21st International Conference on Computer Methods in Mechanics (CMM), Gdansk, Poland, 8-11 September 2015", "year": "2016", "url": "", "author": [ "Bastian Oesterle","Manfred Bischoff","Ekkehard Ramm" ], "authors": [ {"first" : "Bastian", "last" : "Oesterle"}, {"first" : "Manfred", "last" : "Bischoff"}, {"first" : "Ekkehard", "last" : "Ramm"} ], "pages": "41-46","abstract": "The higher inter-element continuity of the Isogeometric Analysis (IGA) applying NURBS functions for geometry as well as mechanics opens up new possibilities in the analysis of thin-walled structures, i.e. beams, plates and shells. The contribution addresses the straightforward implementation of classical theories requiring C1-continuity, such as the Euler-Bernoulli beam and Kirchhoff-Love shell theory. Based on these \u201Csimplest\u201D models shear deformable theories, introducing Timoshenko and Reissner-Mindlin kinematics, are formulated in a hierarchic manner. In contrast to the usual Finite Element concept using total rotations the present model picks up traditional formulations introducing incremental rotations as primary variables. Furthermore an alternative version is discussed with a split of the displacements into bending and transverse shear parts. Both hierarchic concepts can be easily extended to 3D\u2013shell models. The key aspect of this alternative parameterization is the complete a-priori removal of the transverse shear locking and curvature thickness locking (in the case of 3D-shells).", "bibtexKey": "oesterle2016hierarchic" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/26d8149567209f070caa58de0b2215230/ibb-publication", "tags" : [ "SMS","ibb","from:maltevonscheven","inproceedings" ], "intraHash" : "6d8149567209f070caa58de0b2215230", "interHash" : "c63360cbb697da0ff57f46820057f301", "label" : "Variationelle Methoden zur Massenskalierung für eine effizientere explizite Zeitintegration in der Dynamik", "user" : "ibb-publication", "description" : "", "date" : "2021-03-09 13:40:59", "changeDate" : "2021-03-09 12:40:59", "count" : 1, "pub-type": "inproceedings", "booktitle": "K.-U. Bletzinger, N. Gebbeken, R. Fisch (eds.): Berichte der Fachtagung Baustatik - Baupraxis 12.", "year": "2014", "url": "", "author": [ "A.-K. Schäuble","A. Tkachuk","M. Bischoff" ], "authors": [ {"first" : "A.-K.", "last" : "Schäuble"}, {"first" : "A.", "last" : "Tkachuk"}, {"first" : "M.", "last" : "Bischoff"} ], "pages": "705 - 713","abstract": "Um dynamische Finite-Elemente-Berechnungen mit expliziter Zeitintegration zu beschleunigen, ist es in der Praxis üblich, Massenskalierung anzuwenden. Damit soll die kritische Zeitschrittweite erhöht werden ohne maßgeblich an Genauigkeit in den entscheidenden niederfrequenten Moden zu verlieren. Bei der konventionellen Massenskalierung (CMS) wird künstliche Masse zu den Diagonaltermen der diagonalisierten Massenmatrix addiert und die Diagonalform der Massenmatrix bleibt erhalten. CMS wird gewöhnlich auf eine geringe Anzahl kleiner oder steifer Elemente angewandt, deren hohe Eigenfrequenzen die kritische Zeitschrittweite begrenzen. Dabei wird allerdings die Trägheit der Struktur erhöht, was zu unphysikalischen Effekten führen kann. Mit einer sogenannten selektiven Massenskalierung kann wenigstens die translatorische Trägheit (d.h. der Impuls bei gleichmäßiger Anfangsgeschwindigkeit) erhalten werden, allerdings auf Kosten von Nebendiagonaltermen in der Massenmatrix. Diese Methode lässt sich gleichmäßig auf die gesamte Struktur anwenden und hat geringere unphysikalische Nebeneffekte. Bislang werden skalierte Massenmatrizen rein algebraisch, z.B. steifigkeitsproportional konstruiert. Die Auswahl an Skalierungs-Templates ist beschränkt und ihnen liegt keine konsistente Formulierung zugrunde. In diesem Artikel werden variationelle Methoden zur selektiven Massenskalierung vorgestellt, die nicht nur mathematisch konsistent sind, sondern es auch erlauben, gezielt bestimmte Eigenschaften wie die Erhaltung der Trägheit, Reduktion der höchsten Frequenzen und Genauigkeit bei den niedrigen Frequenzen einzustellen. Die Leistungsfähigkeit der Methode wird an numerischen Beispielen mit Tetraeder- und Hexaeder-Elementen demonstriert.", "bibtexKey": "schauble2014variationelle" } ] }