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.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.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.Article Citation - WoS: 16Citation - Scopus: 17Design of a 2-Dof 8r Linkage for Transformable Hypar Structure(Taylor and Francis Ltd., 2012) Korkmaz, Koray; Akgün, Yenal; Maden, FerayDouble curved geometries including hyperbolicparaboloids (hypars) have become a trend in contemporary architecture. However, most of the constructed architectural examples of the hypars are static and cannot offer any form variability. In this paper, a 2-DOF 8R linkage mechanism is introduced to buildtransformable hypar structures. It is inspired from the basic design principles of Bennett linkage. By its distinctive connection details and additional links, this novel mechanism can change its form fromplanar geometries to various hypars. The paper begins with the brief summary of the applications of hypar structures in architecture. Secondly, main principles and deficiencies of the Bennett linkage are presented. According to these deficiencies, structural synthesis of the novel mechanism is considered. Finally, advantages and potential uses of the proposed novel mechanism are explained. © 2012 Copyright Taylor and Francis Group, LLC.