Self-Tuning Closed-Loop Fuzzy Logic Control Algorithm for Adaptive Prestressed Structures

Schnellenbach‐Held, Martina; Steiner, Daniel

doi:10.2749/101686614x13830790993528

Cited by 20 publications

(17 citation statements)

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“…Active brace systems have been tested using hydraulic actuators fitted as cross-bracing elements of the structure, directly controlling its deflections using actively controlled forces (Abdel-Rohman and Leipholz 1983;Reinhorn et al 1992). Displacement control in cable-stayed bridges can be obtained via control forces provided by the stay cables working as active tendons (Rodellar et al 2002;Xu et al 2003). Active cable tendons can also be used to change the amount of prestress in reinforced concrete beams and in steel trusses to limit displacements under loading (Schnellenbach and Steiner 2014).…”

Section: Adaptation In Structural Applicationsmentioning

confidence: 99%

Energy and Cost Assessment of Adaptive Structures: Case Studies

2018

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This paper demonstrates how adaptive design (details published elsewhere) can be employed to save, on average, 70% of whole-life energy on a range of spatial structures, the whole-life energy deriving from an embodied part in the material and an operational part for structural adaptation. Assuming some statistical distribution for the probability of occurrence of the loads, whole-life energy is minimized by combining optimal material distribution and strategic integration of the actuation system, which is only used when loading events exceed a certain threshold. Instead of using more material to cope with the effect of the loads, the active elements change the shape of the structure in order to homogenize the stresses and keep deflections within limits. Five case studies are investigated here: a tall building core, a trussed portal frame, a long-span arch bridge, a 3-pin roof arch, a double-curved shell, and an office tower supported by an exoskeleton structural system. The purpose of the case studies described in this paper is to study (1) adaptive structure performance in terms of mass and energy savings as well as monetary costs for both strength-and stiffness-governed design problems; and (2) design scalability to complex spatial configurations. The case studies confirmed that even for large complex structures, significant energy savings can be achieved, the more so as the structure becomes more stiffness-governed. In this case, the adaptive solution becomes competitive also in terms of monetary costs.

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Section: Adaptation In Structural Applicationsmentioning

confidence: 99%

Energy and Cost Assessment of Adaptive Structures: Case Studies

2018

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“…Deflection reduction in cable stayed bridges can be obtained via control forces provided by the stay cables working as active tendons (Rodellar et al 2002;Xu et al 2003). Active cable-tendons have been used to change the amount of pre-stress in reinforced concrete beams and in steel trusses to limit displacements under loading (Schnellenbach and Steiner 2013). Integration of actuators has been shown to be an effective way to suppress vibrations in high stiffness-to-weight ratio truss structures (Preumont et al 2008).…”

Section: Adaptation In Structural Applicationsmentioning

confidence: 99%

Designing and Prototyping Adaptive Structures—An Energy-Based Approach Beyond Lightweight Design

Senatore

2018

Springer Series in Adaptive Environments

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This chapter presents an overview of an original methodology to design optimum adaptive structures with minimum whole-life energy. Structural adaptation is here understood as a simultaneous change of the shape and internal load-path (i.e. internal forces). The whole-life energy of the structure comprises an embodied part in the material and an operational part for structural adaptation. Instead of using more material to cope with the effect of rare but strong loading events, a strategically integrated actuation system redirects the internal load path to homogenise the stresses and to keep deflections within limits by changing the shape of the structure. This method has been used to design planar and spatial reticular structures of complex layout. Simulations show that the adaptive solution can save significant amount of the whole-life energy compared to weight-optimised passive structures. A tower supported by an exo-skeleton structural system is taken as a case study showing the potential for application of this design method to architectural buildings featuring high slenderness (e.g. long span and high-rise structures). The methodology has been successfully tested on a prototype adaptive structure whose main features are described in this chapter. Experimental tests confirmed the feasibility of the design process when applied to a real structure and that up to 70% of the whole-life energy can be saved compared to equivalent passive structures.

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“…Die Fuzzy Logic beruht auf der Erweiterung der klassischen booleschen Mengenlehre, indem die Zugehörigkeit eines Elements zu einer Menge vom herkömmlichen 0 „falsch“ oder 1 „wahr“ auf kontinuierliche Zugehörigkeitsfunktionen von 0 „gänzlich falsch“ bis 1 „gänzlich wahr“ erweitert wird (Bild 2). Durch diese unscharfen Zugehörigkeiten werden eine außerordentliche Generalisierungsfähigkeit sowie ein stabiles und redundantes Verhalten bei Verwendung der Regeln ermöglicht [13]. Zur Inferenz der Regelbasis, die aus Wenn‐dann‐Regeln mit Zusammenhängen zwischen unscharfen „fuzzy“ Mengen besteht, werden generalisierte logische Operationen eingesetzt, die die Anwendung der logischen Verknüpfung von Fuzzymengen ermöglichen.…”

Section: Introductionunclassified

KI‐Methoden zur Integration tragwerksplanerischen Wissens in frühe Phasen des Gebäudeentwurfsprozesses

Schnellenbach‐Held

Steiner

2021

Bautechnik

Self Cite

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Eine frühe Integration der tragwerksplanerischen Expertise in den Prozess des Gebäudeentwurfs ermöglicht eine effiziente Unterstützung der hochkomplexen Planungsentscheidungen. Zur Bereitstellung und Verwendung des dafür geeigneten Erfahrungswissens des Ingenieurwesens wurde ein wissensbasiertes System (WBS) entwickelt. Dieses kann durch den Einsatz von entwicklungsstufenbezogenen unscharfen Wissensbanken sowie zugehöriger Inferenzsysteme eine Beurteilung von Tragstrukturen und Vorschläge von Entwurfsoptionen leisten. Das Entwicklungsstufensystem enthält eine Bewertung von Tragsystemen basierend auf der Possibilitätstheorie und umfasst Konzepte der adaptiven Entwicklungsstufen. Durch den Einsatz der leicht verständlichen Formulierung von Regeln im Modus Ponens und von Inferenzmechanismen der Fuzzy Logic wird dabei die Nachahmung des menschlichen Entscheidungsverhaltens ermöglicht. Zur Akquise des Wissens werden Parameterstudien mit der Berechnung und Bemessung von Tragelementen des Stahlbetonbaus durchgeführt. Praxiserfahrungen bestimmen die für die im üblichen Hochbau zu erwartenden Strukturen zu berücksichtigenden Wertebereiche. Mechanismen zur Berücksichtigung einer möglichen Ungewissheit von Entwurfsgrößen werden bereitgestellt. Das resultierende WBS ermöglicht schließlich eine Steigerung der Effizienz des Planungsprozesses bereits in frühen Planungsphasen.

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Self-Tuning Closed-Loop Fuzzy Logic Control Algorithm for Adaptive Prestressed Structures

Cited by 20 publications

References 1 publication

Energy and Cost Assessment of Adaptive Structures: Case Studies

Energy and Cost Assessment of Adaptive Structures: Case Studies

Designing and Prototyping Adaptive Structures—An Energy-Based Approach Beyond Lightweight Design

KI‐Methoden zur Integration tragwerksplanerischen Wissens in frühe Phasen des Gebäudeentwurfsprozesses

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