TY - JOUR A1 - Avak, Ralf A1 - Schwuchow, Ronald T1 - Tragfähigkeit von Spannbeton-Fertigdecken aus Plattenbauten der DDR und deren mögliche Wiederverwendung als Massivdach Y1 - 2007 ER - TY - JOUR A1 - Avak, Ralf A1 - Schwuchow, Ronald A1 - Franz, Marcel T1 - Rissmonitoring von Betonoberflächen unter Verwendung digitaler Bildanalyseverfahren Y1 - 2007 ER - TY - CHAP A1 - Schwuchow, Ronald T1 - A Probabilistic Model to Simulate Slender Reinforced Concrete Columns using Quasi-Monte Carlo Methods within SSJ Technology T2 - Multilevel approach to fracture of materials, components and structures, book of abstracts & proceedings on CD-ROM, 2-5 September, 2008, Brno, Czech Republic Y1 - 2008 SN - 978-80-214-3692-3 PB - VUTIUM CY - Brno ER - TY - CHAP A1 - Schwuchow, Ronald T1 - The Application of Quasi-Monte Carlo Method in Reliability Studies of Slender Concrete Columns T2 - Summary, 7th International PhD Symposium in Civil Engineering, Stuttgart, September 11th - 13th 2008 Y1 - 2008 CY - Stuttgart ER - TY - JOUR A1 - Schwitzke, Marko T1 - Innovative column brackets for use in precast construction. An economic alternative to existing bracket solutions Y1 - 2008 ER - TY - GEN A1 - Glaser, Ronny A1 - Schwitzke, Marko A1 - Wiebusch, D. T1 - Hilfsmittel für die Bemessung von stahlfaserverstärktem Stahlbeton Y1 - 2009 ER - TY - GEN A1 - Schwitzke, Marko T1 - Hilfsmittel für die Vorbemessung von Stahlbetonkonsolen Y1 - 2009 ER - TY - GEN A1 - Schwitzke, Marko A1 - Freyer, Thomas A1 - Semmler, C. T1 - Bemessungsnomogramme für Stahlbetonkonsolen Y1 - 2010 ER - TY - GEN A1 - Curbach, Manfred A1 - Jesse, Frank T1 - Textile-reinforced concrete - a building material success story: new developments, practical examples T2 - BFT-International Y1 - 2011 SN - 1865-6528 N1 - 55. Betontage - Nachhaltige Innovation, Neu-Ulm 2011 VL - 77 IS - 2 ER - TY - THES A1 - Schwuchow, Ronald T1 - Probabilistische Zuverlässigkeits- und Sensitivitätsanalysen für schlanke Stahlbetonstützen auf Basis der Quasi-Monte Carlo Methode Y1 - 2010 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:co1-opus-17589 ER - TY - GEN A1 - Avak, Ralf A1 - Goris, Alfons T1 - Stahlbetonbau aktuell : Praxishandbuch 2007 Y1 - 2007 SN - 978-3-89932-151-7 PB - Berlin : Bauwerk Verlag ER - TY - BOOK A1 - Avak, Ralf A1 - Glaser, Ronny T1 - Spannbetonbau - Theorie, Praxis, Berechnungsbeispiele Y1 - 2007 SN - 978-3-89932-172-2 PB - Bauwerk CY - Berlin ET - 2. Auflage ER - TY - CHAP A1 - Jesse, Frank A1 - Stremmel, Wolfgang A1 - Curbach, Manfred ED - Biondini, Fabio ED - Frangopol, Dan M. T1 - Bond Behaviour and Failure Mechanisms of EBR Made of UHM Carbon Fibres T2 - Bridge Maintanance, Safety, Management, Resilience and Sustainability. Proceedings of the 6th International Conference on Bridge Maintenance, Safety and Managemente (IABMAS2012), Stresa, Lake Maggiore, Itale, 8-12 July 2012 N2 - Externally bonded reinforcements (EBR) made of ultra high modulus (UHM) carbon fibres seem particularly interesting for shear strengthening. The extremely high modulus can keep shear cracks small to activate aggregate interlock that is an important component of shear load transfer. An experimental study on RC strain specimens with un-deformed low strength steel bars as internal reinforcement has been conducted to provide design values for UHM carbon sheets and information on load interaction. It has been found that there may be combinations of EBR of UHM carbon fibres and internal un-deformed low strength steel reinforcement that show no strengthening effect. It is shown that the load capacity of UHM carbon fibre sheets might be much lower in structural applications compared to values derived from laboratory tests. The reasoning is based on fibre waviness, inhomogeneous delamination, inappropriate high fibre stiffness that result in a very heterogeneous stress distribution and trigger a collapse like failure at very low ultimate loads. Y1 - 2012 SN - 978-0-415-62124-3 PB - CRC Press CY - London ER - TY - GEN A1 - Schwitzke, Marko A1 - Bachmann, Volkmar A1 - Freyer, Thomas T1 - Nomogramme im Bauingenieurwesen - Zur Konstruktion von Fluchtlinientafeln T2 - Bauingenieur Y1 - 2010 SN - 0005-6650 VL - 85 IS - 2 SP - 82 EP - 86 ER - TY - CHAP A1 - Jesse, Frank A1 - Kutzner, Tobias ED - Curbach, Manfred ED - Opitz, Heinz ED - Hampel, Torsten ED - Scheerer, Silke T1 - Praktische Anwendung der digitalen Photogrammetrie in der Bautechnik – Einfluss wesentlicher Systemparameter und erreichbare Messgenauigkeit T2 - 7. Symposium Experimentelle Untersuchungen in der Baupraxis Y1 - 2013 SP - 115 EP - 129 PB - Techn. Univ., Fak. Bauingenieurwesen CY - Dresden ER - TY - THES A1 - Schwitzke, Marko T1 - Zum Trag- und Verformungsverhalten von Fertigteilkonsolen Y1 - 2011 PB - BTU CY - Cottbus ER - TY - GEN A1 - Kaplan, Felix A1 - Jesse, Frank T1 - Verfahren für Biegeverstärkungen an Stahlbetonbauteilen T2 - Bautechnik Y1 - 2011 U6 - https://doi.org/10.1002/bate.201101482 SN - 0932-8351 VL - 88 IS - 7 SP - 433 EP - 442 ER - TY - CHAP A1 - Sickert, Jan-Uwe A1 - Schwiteilo, Katrin A1 - Jesse, Frank ED - Curbach, Manfred ED - Ortlepp, R. T1 - Statistische Auswertung der Bruchspannung einaxialer Zugversuche an Textilbeton – Vorschläge für Teilsicherheitsbeiwerte T2 - Textilbeton in Theorie und Praxis, Tagungsband zum 6. Kolloquium zu textilbewehrten Tragwerken (CTRS6), gemeinsames Abschlusskolloquium der Sonderforschungsbereiche 528 (Dresden) und 532 (Aachen), Berlin 19.9.2011 - 20.9.2011 Y1 - 2011 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bsz:14-qucosa-77867 SN - 978-3-86780-245-1 SP - 141 EP - 155 PB - Techn. Univ. CY - Dresden ER - TY - GEN A1 - Curbach, Manfred A1 - Jesse, Frank T1 - Textile-Reinforced Concrete – A Building material Success Story: New Developments, Practical Examples T1 - Erfolgsbaustoff Textilbeton – neue Entwicklungen, praktische Beispiele T2 - BFT International Y1 - 2011 N1 - Zugleich Tagungsband zu: 55. Betontage – Nachhaltige Innovation, Neu-Ulm, 8.-10.2.2011 VL - 77 IS - 2 SP - 94 EP - 95 ER - TY - GEN A1 - Hartig, J. A1 - Schicktanz, K. A1 - Jesse, Frank A1 - Häußler-Combe, U. T1 - Influence of experimental setups on the apparent uniaxial tensile load-bearing capacity of Textile Reinforced Concrete specimens T2 - Materials and Structures Y1 - 2012 U6 - https://doi.org/10.1617/s11527-011-9775-0 SN - 1871-6873 VL - 45 IS - 3 SP - 433 EP - 446 ER - TY - CHAP A1 - Jesse, Frank ED - Jesse, Frank T1 - Nachweise für Querkraft und Durchstanzen nach DIN EN 1992-1-1 T2 - Eurocode 2 und aktuelle Entwicklungen im Stahlbetonbau : 19. Brandenburgischer Bauingenieurtag (BBIT2012), Cottbus, 23.3.2012 Y1 - 2012 SP - 33 EP - 55 PB - BTU CY - Cottbus ER - TY - GEN A1 - Jesse, Frank T1 - Ermüdet Textilbeton? Verhalten unter nicht-ruhender Beanspruchung T2 - TUDALIT Magazin Y1 - 2012 IS - 7 SP - S. 20 ER - TY - CHAP A1 - Jesse, Frank ED - Jesse, Frank ED - Osterrieder, Peter T1 - Konstruieren mit Stabwerkmodellen nach DIN EN 1992 (EC2) T2 - Planen und Bauen mit aktuellen Regelwerken, 20. Brandenburgischer Bauingenieurtag, BBIT 2013, 15. März 2013 Y1 - 2013 SP - 97 EP - 114 PB - BTU CY - Cottbus ER - TY - CHAP A1 - Batke, Frank T1 - Entwicklung eines verformungsbasierten Bemessungskonzeptes zur Begrenzung der Rissbreiten bei Verstärkungsschichten aus textilbewehrtem Beton T2 - 54. DAfStb-Forschungskolloquium, 7. und 8. November 2013 an der Ruhr-Universität Bochum Y1 - 2013 SP - 233 EP - 238 PB - Deutscher Ausschuss für Stahlbeton CY - Berlin ER - TY - CHAP A1 - Schulz, Hagen T1 - Analyse signifikanter Schadensbilder an Brücken im Land Brandenburg T2 - 54. DAfStb-Forschungskolloquium, 7. und 8. November 2013 an der Ruhr-Universität Bochum Y1 - 2013 SP - 133 EP - 138 PB - Deutscher Ausschuss für Stahlbeton CY - Berlin ER - TY - GEN A1 - Jesse, Frank A1 - Kutzner, Tobias T1 - Digitale Photogrammetrie in der Bautechnik : Einfluss wichtiger Systemparameter und Genauigkeitspotential in der Praxis T2 - Bautechnik Y1 - 2013 SN - 1437-0999 VL - 90 IS - 11 SP - 703 EP - 714 ER - TY - GEN ED - Jesse, Frank ED - Osterrieder, Peter T1 - Planen und Bauen mit aktuellen Regelwerken : 20. Brandenburgischer Bauingenieurtag BBIT 2013, 15. März 2013 Y1 - 2013 PB - BTU Cottbus-Senftenberg, Lehrstuhl Massivbau CY - Cottbus ER - TY - GEN A1 - Schwitzke, Marko A1 - Bachmann, Volkmar A1 - Noack, Matthias A1 - Freyer, Thomas A1 - Launert, Benjamin T1 - Methodische Ansätze zum Rissmonitoring an Bauteilen durch automatisierte digitale Analyse T2 - Bauingenieur Y1 - 2010 SN - 0005-6650 VL - 85 IS - 11 SP - 455 EP - 459 ER - TY - GEN A1 - Schlaich, Mike A1 - Bleicher, Achim A1 - Pasternak, Hartmut T1 - Der Porsche Pavillon in Monocoque-Bauweise T2 - Bauingenieur Y1 - 2014 SN - 1436-4867 SN - 0005-6650 VL - 89 IS - 1 SP - 1 EP - 10 ER - TY - GEN A1 - Bleicher, Achim A1 - Schlaich, Mike A1 - Fujino, Yozo A1 - Schauer, Thomas T1 - Model-based design and experimental validation of active vibration control for a stress ribbon bridge using pneumatic muscle actuators T2 - Engineering Structures Y1 - 2011 U6 - https://doi.org/10.1016/j.engstruct.2011.02.035 SN - 0141-0296 VL - 33 IS - 8 SP - 2237 EP - 2247 ER - TY - THES A1 - Bleicher, Achim T1 - Aktive Schwingungskontrolle einer Spannbandbrücke mit pneumatischen Aktuatoren Y1 - 2011 U6 - https://doi.org/10.14279/depositonce-3012 CY - Berlin ER - TY - GEN A1 - Liu, Xiaohan A1 - Schauer, Thomas A1 - Goldack, Arndt A1 - Bleicher, Achim A1 - Schlaich, Mike T1 - Accelerometer-based estimation and modal velocity feedback vibration control of a stress-ribbon bridge with pneumatic muscles T2 - Journal of Physics: Conference Series Y1 - 2016 U6 - https://doi.org/10.1088/1742-6596/744/1/012041 SN - 1742-6596 N1 - Proceedings of the 13th International Conference on Motion and Vibration Control (MOVIC 2016) and the 12th International Conference on Recent Advances in Structural Dynamics (RASD 2016) VL - 744 IS - 1 SP - 1 EP - 11 ER - TY - GEN A1 - Bleicher, Achim A1 - Schauer, Thomas A1 - Valtin, M. A1 - Raisch, Jörg A1 - Schlaich, Mike T1 - Active vibration control of a light and flexible stress ribbon footbridge using pneumatic muscles T2 - IFAC Proceedings Volumes Y1 - 2011 U6 - https://doi.org/10.3182/20110828-6-IT-1002.02781 N1 - Proceedings of the 18th World Congress, The International Federation of Automatic Control Milano (Italy) August 28 - September 2, 2011 VL - 44 IS - 1 SP - 911 EP - 916 ER - TY - GEN A1 - Bleicher, Achim ED - Gehlen, Christoph ED - Eligehausen, Rolf T1 - Active vibration control with artificial pneumatic muscles for carbon fibre stress-ribbon bridge T2 - 7th International PhD Symposium in Civil Engineering, Stuttgart, September 11th - 13th 2008 Y1 - 2008 CY - Stuttgart ER - TY - GEN A1 - Bleicher, Achim T1 - Active vibration control - A new approach to build extremely light bridges T2 - Taller, longer, lighter, meeting growing demand with limited resources, IABSE-IASS 2011 London symposium report Y1 - 2011 SN - 978-0-7079-7122-3 PB - Hemming Group CY - London ER - TY - GEN A1 - Schlaich, Mike A1 - Bleicher, Achim A1 - Nier, Mathias T1 - Die Weinbergbrücke in Rathenow T2 - Bauingenieur Y1 - 2016 SN - 0005-6650 SN - 1436-4867 VL - 91 IS - 2 SP - 71 EP - 80 ER - TY - GEN A1 - Bleicher, Achim T1 - Aktive Schwingungskontrolle einer Spannbandbrücke mit pneumatischen Aktuatoren T2 - Bautechnik Y1 - 2012 U6 - https://doi.org/10.1002/bate.201201539 SN - 1437-0999 VL - 89 IS - 2 SP - 89 EP - 101 ER - TY - GEN A1 - Schlaich, Mike A1 - Bleicher, Achim T1 - Spannbandbrücke mit Kohlenstofffaser-Lamellen T2 - Bautechnik Y1 - 2007 U6 - https://doi.org/10.1002/bate.200710028 SN - 1437-0999 VL - 84 IS - 5 SP - 311 EP - 319 ER - TY - GEN A1 - Bleicher, Achim A1 - Schlaich, Mike A1 - Schauer, Thomas ED - De Roeck, G. ED - Degrande, G. ED - Lombaert, G. ED - Müller, G. T1 - Multimodal and multivariable active vibration control for a footbridge – model-based design and experimental validation T2 - Proceedings of the 8th International Conference on Structural Dynamics, EURODYN 2011, Leuven, Belgium, 4 - 6 July 2011 Y1 - 2011 SN - 978-90-760-1931-4 SP - 1525 EP - 1532 CY - Leuven ER - TY - GEN A1 - Schlaich, Mike A1 - Bleicher, Achim T1 - Carbon fibre stress-ribbon bridge T2 - Benefits of composites in civil engineering, conference proceedings, COBRAE conference 2007, University of Stuttgart, Germany Y1 - 2007 PB - COBRAE CY - Leusden ER - TY - GEN A1 - Bleicher, Achim A1 - Schlaich, Mike T1 - Active vibration control with artificial pneumatic muscles for carbon fibre stress-ribbon bridge T2 - Creating and renewing urban structures, 17th Congress of IABSE, Chicago 2008 Y1 - 2008 SN - 978-3-85748-118-5 SP - 318 EP - 319 PB - IABSE-AIPC-IVBH CY - Zürich ER - TY - GEN A1 - Payá-Zaforteza, Ignacio A1 - Bögle, Annette A1 - Bleicher, Achim A1 - Schlaich, Mike T1 - Baukunst in Spanien: educación estructural a través de viajes de estudios T2 - II Jornadas de Enseñanza del Hormigón Estructural, Madrid, 29 y 30 de noviembre de 2007 Y1 - 2007 SN - 978-84-89670-58-7 SP - 221 EP - 227 PB - ACHE, Asociación Científico Técnica del Hormigón Estructural CY - Madrid ER - TY - GEN ED - Bögle, Annette ED - Bleicher, Achim T1 - Tokyo to Hiroshima: Exploration of Japanese Building Culture Y1 - 2017 SN - 978-3-941722-38-5 PB - BTU Cottbus-Senftenberg ; HafenCity Universität Hamburg CY - Cottbus-Senftenberg ; Hamburg ER - TY - GEN A1 - Jirasek, Robert A1 - Schauer, Thomas A1 - Bleicher, Achim T1 - Multi-Variable Active Vibration Control for a Footbridge With Regard to Vertical Bending and Torsional Modes T2 - The 13th International Workshop on Advanced Smart Materials and Smart Structures Technology, July 22-23, 2017, The University of Tokyo, Japan Y1 - 2017 UR - https://www.researchgate.net/publication/319830150_Multi-Variable_Active_Vibration_Control_for_a_Footbridge_With_Regard_to_Vertical_Bending_and_Torsional_Modes CY - Tokyo, Japan ER - TY - GEN A1 - Schauer, Thomas A1 - Liu, Xiaohan A1 - Jirasek, Robert A1 - Bleicher, Achim T1 - Acceleration-based active vibration control of a footbridge using grey-box model identification T2 - 2017 IEEE International Conference on Advanced Intelligent Mechatronics (AIM), Munich, Germany Y1 - 2017 SN - 978-1-5090-6000-9 SN - 978-1-5090-5998-0 U6 - https://doi.org/10.1109/AIM.2017.8014134 SP - 910 EP - 915 PB - IEEE CY - Piscataway, NJ ER - TY - GEN A1 - Jirasek, Robert A1 - Schauer, Thomas A1 - Bleicher, Achim ED - Schlaich, Mike ED - Goldack, Arndt T1 - Model-based active vibration control for next generation bridges using reduced finite element models T2 - Footbridge 2017 Berlin - Tell A Story, 6-8.9.2017, Technische Universität Berlin (TU Berlin) Y1 - 2017 SN - 978-3-9818968-0-0 U6 - https://doi.org/10.24904/footbridge2017.09291 SP - 414 EP - 415 PB - Chair of Conceptual and Structural Design, Fachgebiet Entwerfen und Konstruieren – Massivbau, Technische Universität Berlin CY - Berlin ER - TY - GEN A1 - Bleicher, Achim A1 - Behnke, Ron M. A1 - Schlaich, Mike ED - Bögle, Annette ED - Grohmann, Manfred T1 - Double Curvature for Volkswagen T2 - Proceedings of the IASS Annual Symposium 2017 "Interfaces: architecture.engineering.science", 25 - 28th September, 2017, Hamburg, Germany Y1 - 2017 UR - https://www.researchgate.net/publication/320101296_Double_Curvature_for_Volkswagen CY - Hamburg ER - TY - GEN ED - Bleicher, Achim T1 - Hybride Konstruktionen : 25. Brandenburgischer Bauingenieurtag BBIT 2018 Y1 - 2018 PB - BTU Cottbus-Senftenberg, Lehrstuhl Hybride Konstruktionen - Massivbau CY - Cottbus ER - TY - GEN A1 - Höltke, Tim A1 - Bleicher, Achim T1 - Timber-concrete composite frame joint for high-rise buildings T2 - Proceedings of the International Association for Bridge and Structural Engineering Congress Y1 - 2019 UR - https://www.researchgate.net/publication/336777939_Timber-concrete_composite_frame_joint_for_high-rise_buildings SP - 1137 EP - 1141 CY - New York City, USA ER - TY - GEN A1 - Zhang, Yangwen A1 - Schauer, Thomas A1 - Bleicher, Achim T1 - Assessment of wind-induced vibration suppression and energy harvesting using facades T2 - Proceedings of the International Association for Bridge and Structural Engineering Congress Y1 - 2019 UR - https://www.researchgate.net/publication/336777701_Assessment_of_wind-induced_vibration_suppression_and_energy_harvesting_using_facades SP - 352 EP - 356 CY - New York City, USA ER - TY - GEN A1 - Marker, Paul A1 - Stammen, Lisa A1 - Bleicher, Achim T1 - Energy-efficient actuator placement for a convertible bending-active structure T2 - IASS Annual Symposium 2019 – Structural Membranes 2019, Form and Force, 7–10 October 2019, Barcelona, Spain Y1 - 2019 UR - https://congress.cimne.com/Formandforce2019/admin/files/fileabstract/a328.pdf SP - 1717 EP - 1724 CY - Barcelona, Spain ER - TY - GEN A1 - Jirasek, Robert A1 - Schauer, Thomas A1 - Bleicher, Achim T1 - Linear Parameter-Varying Models for Convertible Structures in Civil and Structural Engineering T2 - IFAC-PapersOnLine N2 - This paper investigates the feasibility of the linear parameter-varying (LPV) framework for modelling the dynamic behaviour of ultra-lightweight convertible structures based on the elastic kinetic motion mechanism with a focus on civil and structural engineering applications. Model building is carried out for the example of a Fin Ray structure. In a first step local linear time-invariant (LTI) models are derived from a finite element model of the structure for different transformation states. On the basis of this collection of local LTI models, a grid-based LPV model is established. The derived LPV model is validated in simulation by comparison with data from a finite element model. Y1 - 2019 UR - http://www.sciencedirect.com/science/article/pii/S2405896319317288 U6 - https://doi.org/10.1016/j.ifacol.2019.11.734 SN - 2405-8963 VL - 52 IS - 15 SP - 555 EP - 560 ER - TY - GEN A1 - Jirasek, Robert A1 - Schauer, Thomas A1 - Bleicher, Achim ED - Mercère, Guillaume T1 - Active Vibration Control of a Convertible Structure based on a Linear Parameter-Varying Model T2 - 3rd IFAC Workshop on Linear Parameter Varying Systems, November 4-6, 2019 N2 - This paper investigates modelling and active vibration control (AVC) of ultra-lightweight convertible structures based on the elastic kinetic motion mechanism with a focus on civil and structural engineering applications. Model building is carried out in the linear parameter-varying (LPV) framework for the example of a convertible Fin Ray structure. In a first step local linear time-invariant (LTI) models are derived from a finite element model of the structure for different transformation states. On the basis of this collection of local LTI models, a grid-based LPV model is established. An AVC of multiple modes is implemented by means of a modal velocity feedback control. Single-input single-output (SISO) control design is carried out with the root locus method for the first and second mode using the same control input under the assumption of well separated eigenfrequencies. The implemented AVC is validated in simulation. Y1 - 2019 UR - http://www.sciencedirect.com/science/article/pii/S240589631932275X U6 - https://doi.org/10.1016/j.ifacol.2019.12.375 SN - 2405-8963 VL - 52 IS - 28 SP - 190 EP - 195 CY - Eindhoven, The Netherlands ER - TY - GEN A1 - Jirasek, Robert A1 - Schauer, Thomas A1 - Bleicher, Achim T1 - Active Vibration Control of a Convertible Structure Based on a Polytopic LPV Model Representation T2 - IFAC-PapersOnLine N2 - This paper deals with modeling and control of lightweight convertible structures for the application in civil and structural engineering. Such structures are prone to vibrations due to their lightweight design. In addition, they exhibit transformation state dependent dynamic behavior. In order to guarantee a reliable operation, the use of active vibration control (AVC) is an effective means. For the example of a simplified convertible structure, modeling is demonstrated using the linear parameter-varying (LPV) framework. Based on local linear time-invariant (LTI) models, derived from a finite element model of the convertible structure, a polytopic LPV model is established. This LPV model is then utilized to design a polytopic LPV output-feedback controller for AVC during the structure’s transformation. The effectiveness of the designed controller is validated in simulation. Y1 - 2020 UR - https://www.sciencedirect.com/science/article/pii/S2405896320321868 U6 - https://doi.org/10.1016/j.ifacol.2020.12.1590 SN - 2405-8963 VL - 53 IS - 2 SP - 8389 EP - 8394 ER - TY - GEN A1 - Zhang, Yangwen A1 - Schauer, Thomas A1 - Wernicke, Laurenz A1 - Wulff, Wulf A1 - Bleicher, Achim T1 - Facade-Integrated Semi-Active Vibration Control for Wind-Excited Super-Slender Tall Buildings T2 - IFAC-PapersOnLine - 21th IFAC World Congress N2 - Nowadays, skyscrapers are getting higher and more slender due to inner-city concentration, which makes the structure more susceptible to dynamic excitations. The design of super-slender skyscrapers is governed primarily by wind excitation. A traditional Tuned Mass Damper (TMD) has been installed in many skyscrapers to mitigate wind-induced vibrations, which has been proven to be very reliable. However, it needs large additional mass and huge installation space near the top of the building, which makes TMD not optimal for superslender skyscrapers. In this paper, a semi-active distributed-Multiple Tuned Facade Damper (d-MTFD) using movable facade elements as damping mass is investigated. The facade elements at the upper stories of the building are parallel movable to the primary structure. Electrical Machines (EM) as variable damper are integrated in their connections to realize semi-active vibration control, which makes the system more effective and robust. For real application, a practical design criterion is that the relative displacement of the facade elements cannot be too large, otherwise it makes the occupants feel uncomfortable. Therefore, multi-objective Genetic Algorithm (GA)-optimized on-off groundhook semi-active control is applied, where two control objectives are optimized. One control objective is to minimize the peak top floor acceleration and the other control objective is to minimize the maximum peak relative displacement of all the facade elements. As a result, a Pareto Front shows that better vibration suppression performance and smaller facade relative displacement can be achieved using the multi-objective optimized controller. Y1 - 2020 UR - https://www.sciencedirect.com/science/article/pii/S2405896320321819 U6 - https://doi.org/10.1016/j.ifacol.2020.12.1585 SN - 2405-8963 VL - 53 IS - 2 SP - 8395 EP - 8400 CY - Berlin ER - TY - GEN A1 - Zhang, Yangwen A1 - Schauer, Thomas A1 - Wernicke, Laurenz A1 - Vrontos, Apostolos A1 - Engelmann, Michael A1 - Wulff, Wulf A1 - Bleicher, Achim T1 - Design of Moveable Facade Elements for Energy Harvesting and Vibration Control of Super Slender Tall Buildings under Wind Excitation T2 - POWERSKIN Conference Proceedings, München N2 - Tall buildings are increasingly built worldwide due to significant economic benefits in dense urban land use. But super-slender tall buildings are very susceptible to wind excitation. Tuned Mass Damper (TMD) and distributed-Multiple Tuned Mass Damper (d-MTMD) have been widely investigated passively and actively and proven to be e cient solutions to mitigate the structure vibration. However, they both need additional mass and huge installation space near the top of the building. In this contribution, a new semi-active distributed-Multiple Tuned Façade Damper (d-MTFD) is investigated that employs the mass of the outer skin of a Double-Skin Façade (DSF) as damping mass. The outer skin of DSF at the upper storeys of the building are parallel moveable to the inner skin fixed on the primary structure. A design criterion besides the damping of the primary structure vibration is that the relative displacement of the outer skin with respect to the inner skin fixed on the primary structure should not be too large. Otherwise, it makes the occupants feel uncomfortable and imposes too high constructional demands. Therefore, on-o ground-hook control is investigated, where the two control objectives are optimized using genetic algorithms. One control objective is to minimize the peak top floor acceleration, and the other control objective is to reduce the maximum peak relative displacement of all the moveable outer skins. This multi-objective optimization results in a Pareto Front, which allows choosing controller settings that yield a good trade-o between both objectives. The approach has been first validated in a simulation with a 306 m benchmark building for a wind speed of 13,5 m/s at 10 m above ground level with a return period of 10 years. Acceptable peak top floor accelerations for hotel usage and a maximal displacement between the primary structure and the moveable outer skin less than ± 0.5 m could be achieved despite the presence of rolling friction. The variable damping coe cients for the on-o ground-hook control can be realized by means of a stepper motor in each moveable DSF element which acts as a generator using customized power electronics for energy harvesting. An open research question is if the harvested energy will be su cient for enabling a self-sustainable operation of the embedded control system and power electronics. Further validations will be carried out in Hardware-in-the-Loop (HiL) simulations in which a currently built prototype of one moveable DSF element will be physically connected to the simulation of the benchmark building. Y1 - 2021 UR - https://www.researchgate.net/publication/351688994_Design_of_Moveable_Facade_Elements_for_Energy_Harvesting_and_Vibration_Control_of_Super_Slender_Tall_Buildings_under_Wind_Excitation SN - 978-94-6366-406-6 SP - 327 EP - 338 PB - TU Delft Open CY - MUNICH ER - TY - GEN A1 - Bleicher, Achim A1 - Schauer, Thomas A1 - Jirasek, Robert A1 - Höltke, Tim A1 - Zhang, Yangwen A1 - Marker, Paul A1 - Wulff, Wulf A1 - Manfrecola, Johannes A1 - Schmidt, Therese T1 - Hybride Konstruktionen an der BTU Cottbus-Senftenberg T2 - Bautechnik N2 - Die angestrebten Ziele einer Ressourcen- und Klimaneutralität erfordern ein radikaleres Umdenken der Bauschaffenden, das mit einer noch viel stärkeren Sensibilisierung der Auftraggeber für die Auswirkungen des Material- und Energieverbrauchs im Bausektor verbunden ist. Ein Ansatz, um diese Ziele zu erreichen, sind hybride Konstruktionen, in denen unterschiedliche Materialien, Elemente, Funktionen und Technologien auf mehreren Konstruktionsebenen ressourcen- und energieeffizient kombiniert sowie im Fall eines Rückbaus sortenrein rezykliert werden. Dieser anspruchsvolle Ansatz ist von Beginn an erklärtes Ziel des Lehrstuhls Hybride Konstruktionen – Massivbau an der BTU Cottbus-Senftenberg und zieht sich durch alle Lehr- und Forschungsaktivitäten. Mit ausgewählten Forschungsprojekten werden Motivation und Methoden hybrider Konstruktionen sowie deren Potenzial für ressourcen- und klimaneutrale Konstruktionen anhand von Prototypen aufgezeigt. Hierbei steht neben der ökologischen Weiterentwicklung klassischer hybrider Konstruktionen aus nachwachsenden und rezyklierten Rohstoffen, bspw. Holz und Recyclingbeton, auch die Entwicklung aktiver hybrider Konstruktionen im Fokus. Die gezielte Integration von aktiven Technologien wie Sensorik, Aktuatorik und Regelungstechnik ermöglicht multifunktionale Konstruktionen, einen hohen Nutzungskomfort, einen geringeren Rohstoffverbrauch bis hin zur Energiegewinnung aus dynamischen Einwirkungen. Y1 - 2021 UR - https://onlinelibrary.wiley.com/doi/abs/10.1002/bate.202100056 U6 - https://doi.org/10.1002/bate.202100056 SN - 1437-0999 VL - 98 IS - 12 SP - 907 EP - 920 ER - TY - GEN A1 - Zhang, Yangwen A1 - Schauer, Thomas A1 - Bleicher, Achim T1 - Optimized passive/semi-active vibration control using distributed-multiple tuned facade damping system in tall buildings T2 - Journal of Building Engineering N2 - To reduce wind-induced vibrations, Tuned Mass Dampers (TMD) are widely used in high-rise buildings. However, traditional TMD system requires large additional damping mass and huge installation space at the top floors of the building. In this paper, a novel distributed-Multiple Tuned Facade Damping (d-MTFD) system is investigated. This system employs the outer skin mass of the Double-Skin Facade (DSF) as the damping mass. In the upper stories, the DSF’s outer skin, mounted on a guide rail system, is designed to be parallel moveable. The passive/semi-active d-MTFD system, which is assumed to be installed on a 76-story benchmark building under across-wind excitation, is optimized using multi-objective Genetic Algorithms (GA) for two defined objectives: minimizing the peak top floor acceleration and controlling the maximum peak relative displacement of all the moveable DSF’s outer skins. On-off groundhook control and displacement-reducing bang-bang control are used as semi-active control strategies. The rolling friction caused by the guide rail system has a considerable impact on the optimization results. These results are presented in the form of Pareto fronts. Optimized parameters can be selected to yield a good trade-off between both objectives. The optimized passive/semi-active d-MTFD systems can highly improve the structural response. Compared with the optimized passive d-MTFD system, the use of semi-active control can reduce the vibration of the DSF’s outer skin significantly. Comparing the selected optimized cases with similar peak top floor acceleration, the peak top floor facade relative displacement using displacement-reducing bang-bang control decreases 58.3%, and the Root Mean Square (RMS) value decreases 61.4%. Y1 - 2022 UR - https://www.sciencedirect.com/science/article/pii/S2352710222004296 U6 - https://doi.org/10.1016/j.jobe.2022.104416 SN - 2352-7102 VL - 52 SP - 104416 ER - TY - GEN A1 - Engelmann, Michael A1 - Wulff, Wulf A1 - Lorenz, Thomas A1 - Frey, Simon A1 - Wernicke, Laurenz A1 - Zhang, Yangwen A1 - Schauer, Thomas A1 - Bleicher, Achim T1 - How to Exploit the Glass Mass for Damping a Building? T2 - Challenging Glass Conference Proceedings N2 - The worlds spectacular skylines host tall and slender buildings to create a maximum of office, residential and commercial space on a minimized footprint. These structures need to cope with increasing wind forces at height and are additionally affected by wind-induced vibration due to their lower natural frequencies. The resulting vibrations make users uncomfortable. Therefore, heavy tuned mass dampers are installed in structures and occupy valuable space especially in the costliest top-floors. As an example, Taipei 101’s steel damper is located between the 87th and 91st floor and weights astonishing 660 metric tons. This raises the need for additional reinforcement which increases cost and carbon footprint.Most buildings in expensive metropolises are cladded with remarkable glass facades. Therefore, we asked the question if it was possible to use the existing mass – more specifically the glass mass in a Double‑Skin Facade – to dampen the building’s movement, create a comfortable space for the user, exploit more floor area for the investor and finally to minimize the amount of building material to reduce carbon footprint for society. The idea was realized in a collaborative research effort of TU Berlin, BTU Cottbus-Senftenberg and Josef Gartner GmbH that resulted in a full-scale mock-up of a Double‑Skin Facade. Its outer skin can move laterally on a guide rail system. As the building starts to move, the facade's inner skin remains fixed to the base structure while the outer skin follows the building’s movement in a delayed manner due to its mass inertia. The fixed inner skin and the moveable outer skin are connected by a spring system that is tuned to the first natural frequency of the base structure. During the motion of the facade’s outer skin, the spring system redirects the relative movement and generates a stabilizing force for the base structure in the opposite direction. Additionally, an electrical machine is placed in between to provide an adjustable damping effect for semi-active and passive control. It also serves the purpose of a generator to study the opportunity to harvest energy. The paper shows the structural design options for the novel facade concept in the context of a project review of Double-Skin and Closed-Cavity Facades. The function of a full-scale mock-up, its fabrication and installation are described to show feasibility and ongoing challenges. First test results reveal a close match between theoretical assumptions and the applied testing. This engineering-driven and experimentally validated design opens a new field of architectural options in sustainable facade design which is focused on tuning physical parameters that affect the damping properties of the global structure. Y1 - 2022 UR - https://proceedings.challengingglass.com/index.php/cgc/article/view/425 U6 - https://doi.org/10.47982/cgc.8.425 VL - 8 ER - TY - GEN A1 - Marker, Paul A1 - Bleicher, Achim T1 - A Hierarchical Optimization Method for the Design of Active Hybrid Structures T2 - Frontiers in Built Environment N2 - In structural engineering, active structures that combine the principles of lightweight construction with bending elastic component behavior are increasingly being investigated. For the realization of a prototype of an active hybrid roof structure at the laboratory of Hybrid Structures at BTU Cottbus-Senftenberg, preliminary investigations on a case study are conducted in the framework of this publication in order to improve the design process of these types of structures. These active hybrids require a higher design effort than classical structures from the field of structural engineering due to a larger number of relevant objectives. Consequently, this study devotes special attention to these essential target criteria and their mathematical formulation. Furthermore, in order to improve the efficiency of this design process, a hierarchical method is derived that is subdivided into two successive partial procedures, which contain specific heuristics that are developed. In this method, after structural optimization, an optimal actuator placement is performed. The subject of a design process involving optimal actuator placement is relatively unexplored for active structures in which components are subjected to large elastic bending deformations and is therefore the focus of this study. In order to verify the functionality of the method and the plausibility of the results of the derived partial methods, a validation of the methodology is performed. Therefore, results of analyses of an active truss structure are compared with those of an active hybrid structure, both derived using the presented method. In addition to validating results, the study intends to investigate whether the performance of an active hybrid structure generated by the proposed method is sufficiently competitive compared to a state-of-the-art active truss structure derived by the same procedure. Y1 - 2022 U6 - https://doi.org/10.3389/fbuil.2022.705434 SN - 2297-3362 VL - 8 SP - 1 EP - 22 ER - TY - GEN A1 - Zhang, Yangwen A1 - Wulff, Wulf A1 - Wernicke, Laurenz A1 - Engelmann, Michael A1 - Schauer, Thomas A1 - Bleicher, Achim T1 - Moveable Facade Elements for Sustainable High-rise Buildings T2 - IABSE Congress Nanjing 2022 - Bridges and Structures: Connection, Integration and Harmonisation N2 - This paper presents a sustainable semi-active distributed-Multiple Tuned Facade Damping (d-MTFD) system that utilizes the existing mass of the Double-Skin Facade's outer skin as damping mass to mitigate structural vibrations caused by wind excitation. Based on this concept, a prototype with one full-scale parallel moveable facade element has been developed, built, and validated. A stepper motor working together with its connected energy harvesting circuit is innovatively applied as an adjustable electrical damper and simultaneously as an energy harvester. Its feasibility has been proven through experiments using Hardware-in-the-Loop (HiL) simulations. An energy harvesting efficiency of 75% was achieved by using a two-stage power converter as the energy harvesting circuit. The self-sufficiency of the semi-active d-MTFD system was achieved. Y1 - 2022 UR - https://www.researchgate.net/publication/364162446_Moveable_Facade_Elements_for_Sustainable_High-rise_Buildings SN - 978-3-85748-184-0 U6 - https://doi.org/10.2749/nanjing.2022.1046 SP - 1046 EP - 1054 CY - Nanjing, China ER - TY - GEN A1 - Marker, Paul A1 - Jirasek, Robert A1 - Schmidt, Therese A1 - Bleicher, Achim T1 - Development, realization, and experimental validation of an active hybrid roof structure based on elastic kinetic and rigid-body transformation T2 - International Journal of Space Structures N2 - Elastic kinetic structures are a recent approach to design transformable structures. Their transformation is based on elastic bending, that is compliant component behavior of structural members. This principle can be used to realize transformable structures with a stable deployment process. Regardless of a stable transformation, elastic kinetic structures are prone to static and dynamic loads due to their lightweight design. However, most of current research on these structures solely focuses on the principles of transformation. This paper proposes a concept for an active hybrid roof structure with a transformation based on elastic kinetics and rigid-body motion. The concept exhibits a stable structural deployment and active control components to counteract static and dynamic disturbances. Furthermore, this paper includes the realization and experimental evaluation of a mid-scale prototype structure. Y1 - 2022 U6 - https://doi.org/10.1177/09560599221134286 SN - 2059-8033 VL - 38 (2023) IS - 2 SP - 83 EP - 100 ER - TY - GEN A1 - Zhang, Yangwen A1 - Wulff, Wulf A1 - Wernicke, Laurenz A1 - Engelmann, Michael A1 - Schauer, Thomas A1 - Bleicher, Achim T1 - Experimental identification and verification of a moveable facade element for energy harvesting and vibration control T2 - Journal of Building Engineering N2 - The distributed-Multiple Tuned Facade Damping (d-MTFD) system was proposed to effectively reduce wind-induced vibrations of high-rise buildings by using the parallel moveable outer skin of the Double-Skin Facade (DSF) as damping mass. A full-scale prototype with a moveable (kinetic) DSF element has been built for first experimental tests using Hardware-in-the-Loop (HiL) simulations. The parallel moveability of the DSF’s outer skin is achieved by mounting it on a smooth-running guide rail system. A stepper motor is applied as an adjustable electrical damper and simultaneously serves as an energy harvester. By using grey-box system identification, all the parameters of the prototype can be accurately estimated. For example, a low equivalent friction ratio of 0.0022 was estimated. The identified model achieved high fitness values (80% to 91%) compared to the measured data, providing the basis for the reliability of the experimental tests using HiL. The prototype is the hardware part of the HiL simulations, which is connected to the simulation part, namely, a 76-story, 306 m high benchmark building assumed to be installed with the d-MTFD system. The feasibility of using a stepper motor as an adjustable electrical damper for semi-active control has been successfully validated based on the HiL simulations. By using semi-active control, the relative displacement of the DSF’s outer skin can be significantly reduced by about 35% compared with using passive control. Energy harvesting performance has also been investigated. The average energy harvesting efficiency of the power electronics was experimentally determined as approximately 75%. With consideration of all the parasitic damping in the connection, the average energy harvesting efficiency was about 50%. For tests under across-wind excitation with a return period of 10 years, the self-sufficient operation of the semi-active d-MTFD system was proven to be achievable based on the prototype results. The average harvested power of the whole benchmark building (with 1000 moveable facade elements) can be predicted as 1.3 kW. Y1 - 2023 UR - https://www.sciencedirect.com/science/article/pii/S2352710222017181 U6 - https://doi.org/10.1016/j.jobe.2022.105712 SN - 2352-7102 VL - 65 ER - TY - GEN A1 - Jirasek, Robert A1 - Schauer, Thomas A1 - Bleicher, Achim T1 - Linear parameter-varying output-feedback for active vibration control of an elastic kinetic roof structure with experimental validation T2 - Engineering Structures N2 - Elastic kinetics are an approach to design transformable lightweight structures with a stable transformation process. The transformation is realized through elastic bending of structural members by exploiting the compliant material behavior. This lightweight and flexible design comes at the cost of increased sensitivity to static and dynamic disturbances. However, most of the current research focuses on the principles of elastic kinetic transformation instead of effective disturbance mitigation. This work focuses on dynamic disturbance mitigation for such transformable lightweight structures using active control. Modeling and controller synthesis are performed in the linear parameter-varying (LPV) framework, since the dynamics of elastic kinetic structures are transformation-state dependent due to geometric nonlinearities. Based on an LPV model in a grid-based representation, an LPV output-feedback control can be designed and synthesized via a gridding approach. This methodology is experimentally tested and validated for the example of an active hybrid roof structure prototype. Y1 - 2024 UR - https://www.sciencedirect.com/science/article/pii/S0141029624004498 U6 - https://doi.org/10.1016/j.engstruct.2024.117887 SN - 0141-0296 VL - 307 SP - 1 EP - 12 ER - TY - GEN ED - Bleicher, Achim T1 - Ressourcen- und energieeffiziente Konstruktionen : 28. Brandenburgischer Bauingenieurtag BBIT 2024 N2 - Der 28. Brandenburgische Bauingenieurtag 2024 an der BTU Cottbus-Senftenberg widmet sich den angestrebten Zielen einer Ressourcen- und Klimaneutralität. Möglich wird dies durch innovative Ansätze und interdisziplinäre Planungs-, Bau- und Betriebsprozesse. Die Referenten zeigen Herausforderungen und Lösungen bei der Entwicklung klimaneutraler Baustoffe und Bauteile sowie deren Weiterverwendung und Kreislauffähigkeit. Darüber hinaus werden Erkenntnisse zur Ertüchtigung und Erhaltung vorhandener Bausubstanz sowie zu leichten, hybriden und adaptiven Konstruktionsansätzen vorgestellt. KW - Dekarbonisierung KW - Ressourceneffizienz KW - Kreislaufwirtschaft KW - Hybride und adaptive Konstruktionen KW - Leichtbau KW - Ökobilanz KW - Holzbetonverbunddecken Y1 - 2024 UR - https://opus4.kobv.de/opus4-btu/frontdoor/index/index/docId/6689 SN - 978-3-940471-77-2 U6 - https://doi.org/10.26127/BTUOpen-6689 SN - 2569-2798 IS - Heft 16 SP - 1 EP - 116 PB - BTU Cottbus-Senftenberg CY - Cottbus ER - TY - RPRT A1 - Höltke, Tim A1 - Manfrecola, Johannes A1 - Bleicher, Achim T1 - Biegetragfähige Holz-Beton-Verbundknoten aus Baubuche zur Aussteifung von Hochbauten N2 - Das hier bearbeitete Forschungsprojekt leistet einen ersten Beitrag zur Entwicklung von biegetragfähigen Holz-Beton-Verbundknoten in Rahmentragwerken zur Aussteifung von Hochbauten. Rahmentragwerke liefern architektonische Vorteile in der Grundriss- und Fassadengestaltung von Gebäuden durch den Wegfall von aussteifenden Verbänden und Schubwänden und sind damit besonders für eine spätere Umnutzung geeignet. Die Entwicklung der hier betrachteten Rahmenknoten basiert auf dem Lastabtrag mehrfeldriger und mehrgeschossiger ebener Rahmensysteme. Der lokale Lastabtrag in der Knotenkonstruktion konnte im ersten Schritt des Projektes auf Grundlage von Stabwerksmodellen visualisiert und nachgewiesen werden. Es wurde darauf geachtet, die verwendeten Materialien – Holz, Beton und Stahl – werkstoffgerecht einzusetzen, um eine größtmögliche Tragfähigkeit zu erzielen. Rahmentragwerke gelten aufgrund der konzentrierten Lastabtragung in den Knoten als hochbeanspruchte Tragwerke. Daher wurde ein hochfestes Buchenfurnierschichtholz der Firma Pollmeier Furnierschichtholz GmbH verwendet, welches eine etwa 3-mal höhere Biegefestigkeit als konventionelle Nadelhölzer aufweist. Zur Untersuchung der statischen Eigenschaften wie Lastabtragungsmechanismen, Grenztragfähigkeiten und Rotationssteifigkeiten wurde eine Versuchsserie mit insgesamt 6 Versuchskörpern im realitätsnahen Maßstab erarbeitet. Die einzelnen Versuchskörper unterscheiden sich in den geometrischen Abmessungen der Riegelquerschnitte, im Stützenanschluss und der Festigkeit des Verbundpartners Beton. Zur besseren Vergleichbarkeit wurden die Betone in der Forschungs- und Materialprüfanstalt (FMPA) der BTU Cottbus-Senftenberg selbst hergestellt, mit dem Ziel vergleichbare Werkstoffeigenschaften zwischen den einzelnen Versuchskörpern zu erzielen bei denen der Beton nicht der Variationsparameter ist. Im Sinne einer nachhaltigen Kreislaufwirtschaft wurde auch untersucht, ob sich Recyclingbeton für die statischen Anforderungen in der Rahmenkonstruktion eignet. Die einzelnen Versuchskörper wurden zum weiteren Erkenntnisgewinn numerisch mit Hilfe der FE-Software Ansys Workbench untersucht. In den räumlichen Modellen wurden, für möglichst realitätsnahe Simulationen der experimentellen Versuche, die materiellen und kontaktbedingten Nichtlinearitäten berücksichtigt. Die numerischen Ergebnisse wurden anschließend anhand der experimentellen Ergebnisse validiert. Die Herstellung der Versuchskörper und die experimentelle Versuchsdurchführung erfolgte in der FMPA. Auf Basis der numerischen und experimentellen Erkenntnisse konnten anschließend maßgebende Versagensstellen identifiziert und ein analytisches Konzept zur Bestimmung der Tragfähigkeit erarbeitet werden. Auch wurden signifikante Verformungskomponenten benannt und zu einem analytischen Gesamtfedermodell der Knotenkonstruktion nach Vorbild der Komponentenmethode aus dem Stahl- und Stahl-Beton-Verbundbau zusammengeführt. Durch ein erstes Gesamtfedermodell kann aus den Verformungen der Komponenten die Rotationssteifigkeit berechnet werden. Das analytische Gesamtfedermodell wurden abschließend mit den experimentellen Ergebnissen validiert. Den Abschluss des Forschungsprojektes bilden Empfehlungen zur Ausbildung duktiler Rahmenknoten im Holz-Beton-Verbundbau auf Grundlage der experimentellen, numerischen und analytischen Ergebnisse. Y1 - 2024 UR - https://www.bbsr.bund.de/BBSR/DE/veroeffentlichungen/bbsr-online/2024/bbsr-online-78-2024.html SN - 1868-0097 VL - 78/2024 CY - Bonn ER - TY - RPRT A1 - Schauer, Thomas A1 - Bleicher, Achim A1 - Zhang, Yangwen A1 - Wulff, Wulf A1 - Wernicke, Laurenz T1 - Schwingungsdämpfung und Energiegewinnung mit beweglichen Doppelfassaden: Entwurf Optimierung und Validierung eines autarken verteilten semiaktiven Systems zur Reduktion Wind-induzierter Schwingungen bei schlanken Hochhäusern N2 - Weltweit werden immer mehr „superschlanke“ Hochhäuser gebaut, da sie bei einer dichten städtischen Flächennutzung erhebliche wirtschaftliche Vorteile bieten. Jedoch sind sie sehr anfällig für Windanregungen. Schwingungstilger sind passiv als auch aktiv Stand der Technik und haben sich als effiziente Lösungen zur Dämpfung Wind-induzierter Strukturschwingungen erwiesen. Dieser Ansatz benötigt jedoch zusätzliche Masse und einen großen Bauraum in den begehrten obersten Etagen. In diesem Forschungsprojekt wurde ein neuer semiaktiver und verteilter Fassadendämpfer untersucht, der die Masse der Außenhaut einer Doppelfassade im Sinne der Ressourceneffizienz als Dämpfungsmasse nutzt. Für die Realisierung einer zeitlich veränderlichen Dämpfung wurde ein mechatronischer Schwingungsdämpfer inklusive Energie-Harvester entwickelt, der Energie in einer Batterie speichert. Zur Validierung der Konzepte und zum Nachweis des autarken Betriebs des geregelten Dämpfungssystems wurde in Zusammenarbeit mit der Josef Gartner GmbH ein bewegliches Doppelfassadenelement als Prototyp realisiert und auf einem Versuchsstand installiert. Dies erlaubt die Durchführung von Hardware-in-the-Loop Simulationen, bei denen ein gesamtes Gebäude simuliert wird und ein einzelnes Fassadenelement als Hardware physisch aktiv ist und sein Verhalten untersucht werden kann. Die Machbarkeit einer autarken semiaktiven Dämpfung mit parallel beweglichen Prallscheiben an Doppelfassaden konnte somit erfolgreich demonstriert werden. Der Ansatz liefert einen Beitrag, den CO2-Fußabdruck eines Hochhauses zu reduzieren. Y1 - 2022 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:101:1-2022112808245531150998 UR - https://www.bbsr.bund.de/BBSR/DE/veroeffentlichungen/bbsr-online/2022/bbsr-online-08-2022.html SN - 1868-0097 VL - 08/2022 CY - Bonn ER - TY - THES A1 - Jirasek, Robert T1 - The linear parameter-varying framework for active vibration control of elastic kinetic structures N2 - Lightweight design is essential for preserving resources, and in addition, transformability can be beneficial for specific applications where multi-functionality is required. Multi-functionality contributes to saving resources by allowing multiple purposes to be served effectively and by allowing adaptation to changing needs. Elastic kinetics are a recent approach to design transformable lightweight structures with a stable transformation process, realized by elastic bending of structural members. Their lightweight and flexible design comes at the cost of increased sensitivity to static and dynamic disturbances. However, most of the current research concentrates on transformation principles instead of on disturbance mitigation. This research focuses on dynamic disturbance mitigation for transformable lightweight structures based on elastic kinetics using active control. The dynamic behavior of such structures is transformation state dependent due to geometric nonlinearities, which is not easily captured by linear time-invariant methods. For this reason, modeling and control design are performed in the linear parameter-varying (LPV) framework. Thereby, two distinct LPV modeling methodologies are investigated, one based on finite element models and another utilizing experimental system identification techniques. Furthermore, LPV control strategies are introduced, which allow to adapt to the varying structural dynamics encountered in elastic kinetics. To validate the efficacy of the modeling and control approaches, a physical demonstrator resembling a segment of an elastic kinetic roof structure is realized within a laboratory environment. This demonstrator structure is used for experimental studies to assess the accuracy and performance of the introduced methods. Utilizing experimental data from the demonstrator structure, a proposed LPV system identification methodology can be applied to derive separate LPV models for the bending and the torsional dynamics of the demonstrator structure. Based on the derived LPV models, a decoupled active vibration control for bending and torsional dynamics by means of an LPV output-feedback is designed. The designed control is implemented on a real-time environment, and its effectiveness is demonstrated experimentally for fixed and for varying operating conditions on the realized demonstrator structure. T2 - Linear parameter-veränderliche Methoden zur aktiven Schwingungskontrolle von elastisch-kinetischen Strukturen Y1 - 2024 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:co1-opus4-67698 PB - BTU Cottbus-Senftenberg CY - Cottbus ER - TY - GEN A1 - Zhang, Yangwen A1 - Wernicke, Laurenz A1 - Wulff, Wulf A1 - Bleicher, Achim A1 - Schauer, Thomas T1 - Design and validation of a dual-functional damper based on a stepper motor for energy harvesting and vibration control T2 - Mechanical Systems and Signal Processing N2 - Dampers are widely used to reduce undesired vibrations. In recent decades, they have been developed from the energy dissipation strategy to the energy harvesting strategy. Dual-functional dampers, which convert part of vibration energy into electrical energy, are intensively studied. DC motors are the most applied electromagnetic transducers in these studies. In this paper, two-phase stepper motors are applied as adjustable electrical dampers and energy harvesters. Dual-functional dampers using stepper motors inherently have higher damping density than those using DC motors, as stepper motors have more pole pairs than DC motors. The nonlinear theoretical electrical damping coefficient of two-phase stepper motors is derived and compared with that of DC motors. A dual two-stage Energy Harvesting Circuit (EHC) is proposed to realize the function of adjustable electrical damping through resistance emulation and the function of harvesting energy. A test bench is built to experimentally verify the adjustable electrical damping and energy harvesting performance of a selected two-phase hybrid stepper motor with the proposed dual two-stage energy harvesting circuit. The numerical solution from the identified model shows a high agreement with the experimental results. The energy harvesting efficiency in the electrical domain has reached about 85%. This tested dual-functional damper using a stepper motor has been successfully integrated into a full-scale demonstrator of the distributed-Multiple Tuned Facade Damping (d-MTFD) system. Y1 - 2023 UR - https://www.sciencedirect.com/science/article/pii/S0888327023004764 U6 - https://doi.org/10.1016/j.ymssp.2023.110568 SN - 0888-3270 SN - 1096-1216 VL - 200 IS - 110568 SP - 1 EP - 19 ER - TY - GEN A1 - Jirasek, Robert A1 - Schauer, Thomas A1 - Su, Di A1 - Nagayama, Tomonori A1 - Bleicher, Achim T1 - Experimental linear parameter-varying model identification of an elastic kinetic roof structure T2 - Engineering Structures N2 - Elastic kinetic structures are a recent approach to design transformable lightweight structures. Their transformation is based on elastic bending, exploiting the compliant material behavior of the structural members. This enables transformable structures with a stable transformation process. However, due to their lightweight and flexible design, elastic kinetic structures are highly sensitive to static and dynamic disturbances. Moreover, such transformable structures exhibit a transformation state dependent dynamic behavior, due to geometric nonlinearities. Nevertheless, most of current research focuses on the principles of elastic kinetic transformation than on effective disturbance mitigation. The latter is usually designed based on low-order control-oriented models. This paper describes a system identification methodology, suitable to identify low-order models for the transformation state dependent dynamics of elastic kinetic structures. The system identification is carried out using a local approach in the linear parameter-varying (LPV) framework. For the identification of local linear time-invariant (LTI) models, the system realization using the information matrix (SRIM) method is applied. The collection of local LTI models is internally balanced using a balancing transformation, in order to represent the locally estimated models with respect to a common state–space basis. Via linear interpolation, an LPV system in grid-based representation is derived. This methodology is experimentally validated with data from an active hybrid roof structure prototype. Y1 - 2023 UR - https://linkinghub.elsevier.com/retrieve/pii/S0141029623014013 U6 - https://doi.org/10.1016/j.engstruct.2023.116986 SN - 0141-0296 VL - 297 SP - 1 EP - 13 ER - TY - THES A1 - Zhang, Yangwen T1 - Self-sufficient semi-active vibration control of high-rise buildings under wind excitation by moveable double-skin facades N2 - The accelerated urbanization has led to increasing tension on urban land use. In this context, more and more slender high-rise buildings are being built worldwide in pursuit of better economic benefits. However, these structures are susceptible to wind excitation due to their lower first natural frequency. Different passive, semi-active, and active damping systems have been developed to reduce wind-induced structural vibration. Among them, the tuned mass dampers are widely used and proved as a very effective method in practice. However, this system requires a large additional damping mass. This also causes additional reinforcement, which increases the cost and carbon footprint. A huge space near the top story of the building is needed for the installation. In this research, a novel system named distributed-Multiple Tuned Facade Damping (d-MTFD) system is proposed by using specially designed parallel moveable Double-Skin Facade (DSF) outer skin as damping mass. These moveable facade elements can be installed on the upper stories of the high-rise building. Smooth-running guide rail systems are used to achieve the parallel moveability. Multi-objective optimization based on the Genetic Algorithm (GA) is applied to reduce the maximum top floor acceleration (Objective I) and to reduce the maximum facade relative displacement (Objective II) simultaneously. The optimization results for the passive and semi-active systems are presented in the form of the Pareto front. The trade-off between these selected two competing optimization objectives is observed. This approach was first validated in a simulation using a 306 m tall reference building for a wind speed of 13.5 m/s at 10 m above ground level with a return period of 10 years. Acceptable peak accelerations at the top story for hotel use and a maximum facade relative displacement of less than ±0.5 m could be achieved for the benchmark building with the d-MTFD system. For semi-active control, the variable damping coefficient can be achieved by using stepper motors in generator mode. The electrical damping coefficient can be continuously adjusted by the developed power electronics. In addition, electrical energy can be generated and stored in a battery. A full-scale prototype with one parallel moveable facade element was built. Based on the prototype, the functionality of the semi-active control using a stepper motor and its energy harvesting performance was tested by applying Hardware-in-the-Loop (HiL) simulations. Greybox system identification was used to estimate some parameters (spring stiffness, friction, etc.) in the connection. The accurate system identification results ensure further validation using HiL simulations. The HiL simulations successfully demonstrated the feasibility of a self-powered semi-active d-MTFD system. Y1 - 2023 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:co1-opus4-63811 SN - 2569-2798 CY - Cottbus ; Senftenberg ER - TY - GEN A1 - Höltke, Tim A1 - Bleicher, Achim T1 - Experimental and numerical investigations of a timber-concrete composite frame joint for high-rise buildings T2 - Engineering Structures N2 - This paper presents a recently developed joint for timber-concrete composite frames. The developed joint was studied in terms of its ability to transfer bending moments, normal and shear forces resulting in a frame structure under horizontal and vertical loads. Several aspects are taken into account during the development and manufacturing process such as the material-appropriate use and a simple assembly concept. A series of experimental full-scale tests, with extensive measurements, were conducted consisting of five test specimens to investigate the static properties of the joint construction. The focused properties are the bending and rotational capacity as well as a ductile beam-to-column connection. For all specimens beech laminated veneer lumber was used, varying the geometric dimensions of the column and composite beam as well as the concrete strength. In addition to the experimental investigations, a numerical model was developed and validated using local strains, global deformations and rotational stiffness. Relevant numerical input parameters, which were not determined experimentally, were investigated as part of a numerical parameter analysis. Y1 - 2025 UR - https://www.sciencedirect.com/science/article/pii/S0141029625004250 U6 - https://doi.org/10.1016/j.engstruct.2025.120034 SN - 0141-0296 VL - 333 SP - 1 EP - 21 ER - TY - CHAP A1 - Freymann, Konrad A1 - Schauer, Thomas A1 - Bleicher, Achim ED - GmbH, Messe Düsseldorf T1 - Adaptive Doppelfassade zur Schwingungskontrolle T1 - Adaptive double-skin facade for vibration control T2 - Beyond Transparency Y1 - 2024 UR - https://www.glasstec-online.com/cgi-bin/md_glasstec/lib/pub/object/downloadfile.cgi/gtl2024_ebook.pdf?oid=29647&lang=2&ticket=g_u_e_s_t SP - 26 EP - 26 PB - Messe Düsseldorf GmbH CY - Düsseldorf ER - TY - GEN A1 - Bleicher, Achim A1 - Höltke, Tim A1 - Manfrecola, Johannes T1 - Hybrid structures for tall buildings with hardwood LVL and concrete T2 - IABSE Symposium 2025, Environmentally Friendly Technologies and Structures - Focusing on Sustainable Approaches, May 18-21, 2025, Tokyo, Japan N2 - New fire design approaches enable innovative load-bearing and bracing concepts for tall buildings made of timber. As a renewable building material, timber in combination with concrete is currently setting new heights and at the same time offers a high CO2 saving potential. Usually, timber-concrete composite structures are mainly used in the floor slabs to ensure sound insulation and fire protection. This paper presents a newly developed beam-to-column joint for timber-concrete composite frames, which has been studied in terms of its ability to transfer bending moments, normal and shear forces. A series of full-scale experimental tests were conducted to investigate the structural properties of the joint design. In addition, all specimens were analysed numerically to verify the load transfer mechanisms. As an overall result, the test specimens showed a ductile behaviour beyond their primary failure. Finally, hybrid multi-story frame systems with rigid beam-to-column connections can be used for structural bracing of mid-rise buildings and efficiently combined with an (excentric) core for high-rise buildings. KW - Hybrid structure KW - Hardwood laminated veneer lumber KW - Beam-to-column connection KW - Timber-concrete composite KW - Frame system KW - Tall building KW - Experimental and numerical analysis Y1 - 2025 SN - 978-3-85748-206-9 U6 - https://doi.org/10.2749/tokyo.2025.1927 SP - 1927 EP - 1934 PB - International Association For Bridge And Structural Engineering (IABSE) CY - Zürich ER - TY - GEN A1 - Freymann, Konrad A1 - Schauer, Thomas A1 - Bleicher, Achim T1 - Lifetime extension for steel railway bridges using additional damping : a case study for an existing bridge T2 - IABSE Symposium 2025, Environmentally Friendly Technologies and Structures - Focusing on Sustainable Approaches, May 18-21, 2025, Tokyo, Japan N2 - Steel bridges as slender and highly articulated lightweight structures are exceedingly exposed to fatigue damage due to traffic. Especially railway traffic is causing significant stress variations, the material can only withstand a limited amplitude and number of stress cycles. This results in a reduced lifetime of the bridge. This paper gives an overview of the material behaviour of steel due to fatigue. The lifetime capacity of an existing bridge as reference is analysed according to the current state of technology based on a simplified FE-Model. Further, the potential for extending the lifespan by reducing the vibration cycles through additional damping is numerically investigated for the referred bridge. A possible direct correlation between fatigue-relevant stress and the remaining service life of the existing bridge is demonstrated. KW - Steel railway bridges KW - Steel fatigue KW - Damping KW - Lifetime extension KW - Young modulus Y1 - 2025 SN - 978-3-85748-206-9 U6 - https://doi.org/10.2749/tokyo.2025.1885 SP - 1885 EP - 1893 PB - International Association For Bridge And Structural Engineering (IABSE) CY - Zürich ER - TY - THES A1 - Marker, Paul T1 - Generalized method for an efficient design of active hybrid structures : in the stress field between stiffness and compliance N2 - In structural engineering, active structures that combine the principles of lightweight construction with flexible component behavior are increasingly being realized. Within this approach, the lightweight design offers material-efficient structures which, due to their reduced mass, provide a good basis for an energy-efficient actuation. In addition, the use of flexible component behavior provides the possibility to keep the number of required actuators as low as possible, while maintaining a high degree of adaptability. Therefore, the resulting active hybrid structures represent a promising approach with respect to the development of sustainable active structures in our built environment. Due to a larger number of relevant objectives, this new kind of structures requires a higher design effort compared to classical structures from the field of structural engineering. This dissertation aims to contribute to a more efficient and generalized design process for active hybrid structures. In order to achieve this goal, several strategies have been investigated. First of all, useful target criteria related to the mentioned relevant areas are derived. These should enable a more target-oriented design and provide a basis for formulating appropriate target weighting, allowing the development of ideal compromise solutions that combine structural stiffness, bending elastic transformation behavior and an efficient actuation concept. In addition, a variety of approaches have been investigated to improve the design process of active hybrid structures in a broad stress field between stiffness and compliance. These mainly include the aspects of structure generation, analyses for an optimal load transfer as well as the determination of an associated optimal actuation concept. In the context of this thesis, different subroutines are investigated for the mentioned partial steps of an overall hierarchical method which were implemented in a software application. Some variations of this generalized method were applied to diverse structural case studies of cantilevered systems with different degrees of structural stiffness. Three of these examples, representing segments of roof structures that differ in terms of their bending elastic transformation behavior, were analyzed in more detail in this thesis. These analysis results were verified on real active hybrid prototypes. KW - Tragwerk; Leichtbau; Hybridbauweise; Bauentwurf; Software KW - Aktive hybride Konstruktionen; Aktuatorplatzierung; Digitaler Entwurf; Hierarchische Optimierung; Strukturoptimierung KW - Active hybrid structures; Actuator placement; Digital design; Hierarchical optimization; Structural optimization Y1 - 2025 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:co1-opus4-69466 SN - 2569-2798 PB - Brandenburgische Technische Universität CY - Cottbus ; Senftenberg ER -