Architecture / Mimarlık
Permanent URI for this collectionhttps://hdl.handle.net/11147/24
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Article Citation - Scopus: 2Kırılan Temsiliyet : Libeskind'de Bellek,tarih ve Mimarlık(Orta Doğu Teknik Üniversitesi, 2009) Maden, Feray; Şengel, DenizMimarisini ‘yokluk,’ ‘yitirilmişlik’ ve ‘bellek’ kavramları üzerinden çizgiler, çarpıtılmış açılar, kesişen geometriler ve boşluklar etrafında kurgulayan Daniel Libeskind, çok disiplinli mimarisi ve radikal yaklaşımları ile kuşkusuz mimarlık kuram ve pratiğini etkileyen ustaların başında gelmektedir (1). Bellek ve tarihin ‘izleri’ üzerinde şekillenen projeleri ve çoğunlukla da müze yapıları ile karşımıza çıkan Libeskind, Rönesanstan bu yana süregelen mimarlıkta temsiliyet sorunsalı, mimarî temsil ve temsilin mimarlığı gibi tartışmalara, sergilediği aykırı mimari ile yeni bir yön kazandırmaktadır. Makalenin hedefi, Libeskind’in proje ve çizimleri üzerinden, mimarın tarihi yorumlaması çerçevesinde temsiliyet sorununu irdelemektir. Bu irdeleme, mimarlık ile tarih arasında kurulan ilişki bakımından birbirinden farklılaşan modern ve postmodern dönemler arasında kendisine yeni bir konum bulan Libeskind’in tarih anlayışını bir kez daha gözden geçirerek yorumlamayı amaçlamaktadır. Yazı ayrıca Libeskind mimarisinin, mimarlığın geleneksel temsillerinden farklılaşarak disiplinler arası bir yaklaşımla diğer alanlarla kurduğu ilişkiyi sorgulamayı da hedeflemektedir.Conference Object Citation - WoS: 1Citation - Scopus: 2Structural Comparison of Scissor-Hinge Linkages(CRC Press, 2019) Maden, Feray; Akgün, Yenal; Yücetürk, Kutay; Aktaş, Engin; Yar Uncu, Müjde; Mitropoulou, C.Deployable structures can deploy from a compact to an expanded configuration by changing their sizes. The behaviors of these structures depend on some parameters such as geometric shape, member sizes and kinematic properties. To provide the deployment, not only the arrangements of structural members but also some restrictions must be considered. Moreover, contiguous members of the structures must let the large rotations to provide the transformation between different geometric forms from fully folded to fully deployed configurations. These requirements have an important impact on the fundamental properties of the structures related with structural performance, such as stiffness and strength. In this paper, stiffness of different scissor-hinge linkages are analyzed and compared. These linkages cover the same span with almost the same geometry and have the unit elements with same size and same weight. However, the geometry of unit elements is different from each other. The paper investigates the effect of this difference on the stiffness of whole system. © 2019 Taylor & Francis Group, London.Conference Object Citation - WoS: 3Citation - Scopus: 3Dynamic Shelter Structure(CRC Press, 2019) Maden, Feray; Ölmez, Duhan; Gür, Şebnem; Yar Uncu, Müjde; Mitropoulou, CharaDynamic building envelopes have entered the mainstream practice of architecture in the last decades. Such dynamic systems are capable of changing their geometric configurations repeatedly and reversibly relative to environmental conditions and occupant requirements. Thus, they may offer innovative building solutions by folding, expanding or curling. This study proposes a dynamic shelter structure that provides several shape options in response to the changing needs. In order to generate the shelter structure, first, loop assembly method used for developing the structure is introduced. Then, a parametric model is built in Grasshopper® not only to analyze the geometric properties of the loops and their alternative geometric forms but also to develop a flexible tool allowing changes at topological, geometrical and structural levels. Based on the geometric analysis, the structural mechanism is constructed. Transformation capability and possible configurations are studied. The proposed structure can transform itself into multiple forms (from planar configuration to S-shaped and reversed S-shaped configurations) with single DOF although the existing single DOF scissor structures can deploy between two geometric shapes. © 2019 Taylor & Francis Group, London.Article Citation - WoS: 19Citation - Scopus: 20A Critical Review on Classification and Terminology of Scissor Structures(Int. Association for Shell and Spatial Structures, 2019) Maden, Feray; Akgün, Yenal; Kiper, Gökhan; Gür, Şebnem; Yar, Müjde; Korkmaz, KorayWhen the existing literature on the research of scissor structures is thoroughly investigated, it is seen that different researchers use different terminologies and classifications especially for the definition of the primary units and the motion type. Some of the studies define the whole geometry based on the geometric properties of the primary scissor units and the unit lines while some other studies define it according to the loops. All these studies use different names for similar elements. This article aims to review the literature on the classification and terminology of scissor structures and represent the state of art on the studies. Tables are represented showing all approaches in the literature. In addition, the article criticizes the missing points of each terminology and definition, and proposes some new terminology. In order to arrive at this aim, different definitions of the primary scissor units and motion types used in key studies in the literature are investigated thoroughly. With several examples, it is demonstrated that naming the scissor units according to the resulting motion type might be misleading and it is better to specify the motion type for the whole structure. A classification for transformation of planar curves is presented.Article Citation - WoS: 3Geometric and Kinematic Analysis of Deployable Doubly Ruled Hyperboloids(Yıldız Teknik Üniversitesi, 2017) Maden, Feray; Korkmaz, KorayThis paper aims to develop deployable doubly ruled hyperboloid surfaces that can be used in architectural applications. First, the study systematically analyzes the geometric principles of hyperboloids generated by the ruled surface generation method and examines the morphology to generate different types of hyperboloids. Then, a method is introduced to construct deployable doubly ruled hyperboloid surfaces. The study demonstrates that deployment behavior of the hyperboloid is directly related to joint types used at the intersection points of the bars. Based on kinematic analysis, the study establishes that deployable hyperboloids with a single degree of freedom can be constructed only by revolute and spherical joints. Finally, various hyperboloids having different number of intersections are constructed according to the proposed joint types and their deployment capabilities are discussed.Book Part Scissor Linkages in the Design of Adaptive Morphologies(Walter de Gruyter GmbH, 2019) Akgün, Yenal; Maden, Feray; Gür, Şebnem; Kiper, Gökhan; Korkmaz, Koray; Aktaş, Engin; Yar Uncu, MüjdeScissor linkages are capable of forming various expandable structures. Architects can benefit from this type of linkage especially for designing adaptive, movable, transformable shell structures and deployable beam-like structures. Product designers may benefit as well. The two different methods described here convey the basic design approaches. The unit-based method is very effective for obtaining primary geometries like a dome, arch, circle or line, using serial multiplications and arrays of one of the scissor unit types presented here. The loop assembly method is more convenient when a final form, be it straight or free-form, is the main point of departure. In this case, unlike in the unit-based method, it is not necessary to opt for a specific scissor unit type and its dimensional constraints from the beginning. Designers can choose a type and number of loops and then define the scissor units following the loop sides. Since deployability is guaranteed by applying this method, the architect is free to choose the loop type most suitable for the functional needs and aesthetic concerns of the specific design. With the loop assembly method all loop alternatives can be assembled to scissor structures, their possible motions can be tested and evaluated in a short time, whereas the unit-based method is limited to a single type of motion that a specific unit can provide.Article Citation - Scopus: 11A Novel Planar Scissor Structure Transforming Between Concave and Convex Configurations(WITPress, 2017) Yar, Müjde; Korkmaz, Koray; Kiper, Gökhan; Maden, Feray; Akgün, Yenal; Aktaş, EnginIn this paper, a novel two-dimensional scissor structure that transforms between concave and convex configurations is presented. The structure is designed by a method of assembling kite or anti-kite loops in the flat configuration. Angulated units are generated from the assembled loops. Finally, a new angulated scissor unit is introduced in order to design the novel scissor structure.Conference Object Citation - WoS: 3Citation - Scopus: 3Design of Adaptive Structures by Kinematic Synthesis of Mechanisms(CRC Press, 2013) Akgün, Yenal; Maden, Feray; Korkmaz, KorayParallel to the development of material science and computer technologies, adaptive structures and smart building components have become the demand of contemporary architecture. However, in order to design adaptive systems, basic knowledge on kinematic synthesis is needed. This paper introduces the fundamental principles of the kinematic synthesis of mechanisms and expresses the potential structural uses of common mechanisms. For this purpose, main concepts of the mechanisms are introduced and types of kinematic synthesis are explored by the help of innovative examples. In this context, firstly, type synthesis methods are explained. Second step covers the path generation rules, and the final step includes the design of multi-loop and chain mechanisms. During the explanation of the aforementioned principles, innovative adaptive structures which are designed by the authors are introduced as well. These structures are all derived from common planar and spatial mechanisms such as four-bar linkages, Watt mechanisms, scissor systems, Bennett linkages and different multi-loop mechanisms.Conference Object Citation - Scopus: 2Design of Reconfigurable Doubly-Curved Canopy Structure(CRC Press, 2013) Maden, Feray; Korkmaz, Koray; Akgün, YenalIn this paper, a new reconfigurable doubly-curved structure has been developed for a canopy roof. The proposed structure can transform itself to various configurations according to the activity and user requirements. It not only changes its shape from a planar geometry to doubly-curved geometries by means of actuators, but also becomes stable and carries loads. The main differences between proposed structure and similar deployable bar structures are that the proposed structure is more flexible with 2DoF and it requires less number of bars and joints. To obtain the doubly-curved geometry, a novel method has been introduced. After discussing the kinematic behavior of the system, a set of structural analyses are performed in three different geometric configurations of the proposed structure.Article Citation - WoS: 75Citation - Scopus: 95A Review of Planar Scissor Structural Mechanisms: Geometric Principles and Design Methods(Taylor and Francis Ltd., 2011) Maden, Feray; Korkmaz, Koray; Akgün, YenalThis study deals with a review of planar scissor structural mechanisms (SSMs) and reports on how they can be easily transformed from a stowed to a deployed configuration. These mechanisms have an important transformation capacity of their extension and rotation properties, and many examples have been proposed that vary in size, type and geometry. Although there are many studies dealing with designing new planar or spatial SSMs and their calculation methods, there is no systematic study demonstrating the basic typologies, geometric principles, design rules and constraints of such SSMs. Further, current calculation methods are based on the inductive approach in which the dimension of one scissor unit (SU) is given, but the span of the whole structure is found later according to the number of SUs that are used to assemble the structure. However, this approach is not convenient for architectural applications, because it requires a deductive approach in which the dimensions and required number of SUs are calculated according to defined span length. On the basis of this concept, this article, first, analyses the geometric design of SSMs systematically in terms of their possible configurations and then develops trigonometric calculation methods for different types of SSMs, using a deductive approach.