Browsing by Author "Maden, F."

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Citation - WoS: 2
Citation - Scopus: 2
A Case Study on the Selection of Optimum Loop Units for the Deployable Arch Structures Exposed to Lateral and Non-uniform Gravity Loads
(ELSEVIER SCIENCE BV, 2020) K. Yuceturk; E. Aktas; F. Maden; S. Gur; C. C. Mitropoulou; Mitropoulou, C.C.; Aktaş, E.; Yücetürk, K.; Maden, F.; Gur, Ş.; ND Lagaros; KM Abdalla; GC Marano; MC Phocas; R AlRousan
Radially deployable arches may be created by using various types of units. However for any deployable structure to be constructed in real life it should satisfy the structural regulations and codes. Despite various advantages from architectural perspective deployable structures are weak to satisfy the operational code limits when compared to trusses with similar height and span. Therefore weight minimization is very important to reduce the dead loads of the structure which facilitates the code-conformance of the structure. The optimization of the deployable structures requires an initial selection of the loop types to define the structure parametrically. An initial selection strategy depending on the loads on the structure is important to increase the efficiency of optimization process. Under uniform gravity loads optimum arrangement for each unit type converges to a similar point. However in the real world the loads on the arches are not always uniform and the structure is exposed to nonuniform loadings such as point loads or lateral loads. This work focuses on the performance of various arches with different unit types under lateral and non-uniform vertical loads. Different lateral load and non-uniform gravity loading scenarios are created. For each scenario the arches with different units are analyzed. In all cases clear span and height are kept as same. The performance of an arch with a specific unit type for a given load is measured with a score that includes the deformations and the weight of the structure. All the members are assumed to be circular hollow sections with variable diameter and thickness to have a meaningful weight comparison between structures. This work intends to define an initial selection guide for deployable arches under typical non-uniform and lateral loading conditions. (C) 2020 The Authors. Published by Elsevier B.V.
Citation - Scopus: 11
A novel planar scissor structure transforming between concave and convex configurations
(Wit Press, 2017) Müjde Yar; Koray Korkmaz; Gökhan Kiper; Feray Maden; Yenal Akgün; Engin Aktaş; Korkmaz, K.; Yar, M.; Kiper, G.; Akgün, Y.; Aktaş, E.; Maden, F.
In 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. © 2023 Elsevier B.V. All rights reserved.
Citation - WoS: 3
Citation - Scopus: 3
Dynamic shelter structure
(CRC PRESS-BALKEMA, 2019) F. Maden; D. Olmez; S. Gur; M. Y. Uncu; C. Mitropoulou; Olmez, D.; Mitropoulou, C.; Uncu, M. Y.; Maden, F.; Gur, S.; PJS Cruz
Dynamic 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 (R) 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.
Citation - WoS: 1
Geometric variety of scissor linkages according to loop geometry: A case study of a canopy design
(CRC PRESS-BALKEMA, 2022) B. Atlamaz; Y. Akgun; F. Maden; C. Kavuncuoglu; O. Kilit; Kilit, O.; Atlamaz, B.; Kavuncuoglu, C.; Akgun, Y.; Maden, F.; A Jefferies; M Cubric
Scissor linkages are used in various applications since they provide many advantages in comparison to other types of deployable structures. In literature there are two geometric design methods for these linkages: unit-assembly method and loop-assembly method. The unit-assembly method is an inductive method based on the serial multiplication of scissor units. On the contrary the loop-assembly method is a deductive method which is based on the alignment of selected loop types on the desired base curve. Due to its design methodology the loop-assembly method allows creating not only various scissor linkages with different primary units but also different geometric configurations for the initial curve. This paper aims to investigate geometric varieties of scissor linkages generated using the loop-assembly method and to reveal their potential applications. For this purpose first quadrilateral loops loop-assembly method and kinematic analysis of a sample scissor linkage based on the quadrilateral loops have been presented. Then five different scissor linkages having the same curvilinear geometry in their initial configurations have been generated and the variations in their deployment behaviors due to the loop types have been presented. Finally a canopy structure composed of kite loops has been proposed and its transformation capability has been discussed.
Citation - WoS: 1
Citation - Scopus: 2
Structural comparison of scissor-hinge linkages
(CRC PRESS-BALKEMA, 2019) F. Maden; Y. Akgun; K. Yuceturk; E. Aktas; M. Y. Uncu; C. Mitropoulou; Mitropoulou, C.; Akgün, Y.; Aktaş, E.; Uncu, M.Y.; Maden, F.; Yücetürk, K.; PJS Cruz
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.