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Altmann Linkage Networks and Light-Shelf Application With a Single Linkage
(01. Izmir Institute of Technology, 2022) Atarer, Fulya; Korkmaz, Koray
Today's understanding of architecture has revealed the need for structures that allow geometric form changes due to spatial and functional requirements. For this purpose, deployable structures have taken their place in architecture. These structures provide flexibility and multiple uses. While scissor mechanisms and bar mechanisms have been observed in architectural applications in deployable structures, over-constrained linkages have been used especially in recent studies of deployable structures. Over-constrained linkages make deployable structures more stable to loading. In this dissertation, the possibilities of systematically designing the single degree of freedom (DoF) networks using a kind of spatial overconstrained linkage called Altmann linkage as a basic module. The literature is investigated deeply that the conducted studies on network assemblies have been on different over-constrained linkages as a basic module, such as Sarrus, Bennett, and Bricard. There are few studies related to the Altmann linkage. None of these studies are in-depth studies to design a network based on the Altmann linkage. Also, an architectural application of the Altmann linkage has not been studied yet. This dissertation represents three main subjects: understanding the geometric properties of an Altmann linkage, designing one degree of freedom networks of Altmann linkage, and designing and analyzing an Altmann light shelf. Firstly, the geometry of the unit linkage is parameterized and its position kinematics is solved. Then, ten different single DoF Altmann networks are designed. By choosing one of the ten different networks designed, the network with folded and vault configurations is developed through assembly mode change. Afterward, light shelves are designed in Solidworks. Then, square and rectangular designs are compared in terms of their angles with the building and the west. Finally, daylight performance analyzes are made in the Relux software.
A New Design Approach for Planar Retractable Plate Structures Based on Uniform Tessellations
(Izmir Institute of Technology, 2016) Gazi Gezgin, Aylin; Korkmaz, Koray
Designs of the retractable plate structures have started to gain importance after the increase in the application of kinetic roofs, facades and surfaces in architecture since last decade of twentieth century. Thus many researchers try to find the most suitable form of the rigid plates by the help of kinematic and numerical analysis in order to fulfil the task of covered enclosure without any interference, gaps or overlaps between the plates. Considering previous works, this study aims to create a method for designers that transform; the predefined rigid plates into retractable plate structures (RPS) without using any complex kinematic or numerical analysis. Throughout the study, shapes of the rigid plates are selected as regular polygons. Tessellation technique is utilized which shows a proper way of covering a plane by using regular polygons. In the light of this aim, the detailed investigation of how regular polygons are combined in a plane is being carried out. Also two general conditions for the assembly of rigid regular polygonal plates are discovered so that tessellation can form RPS without any interference, gaps or overlaps between each other in closed and open configurations. Then two distinct methods are proposed to design the extra link for the RPS that do not satisfy these two conditions to make them totally operational with respect to the design constraints. Additionally, another method is proposed for the shape modification of the plates where the tessellation satisfies the conditions. Furthermore, for the multi degrees of freedom retractable structures, another method is proposed to convert them into single degree of freedom RPS by utilizing graph theory and duality. In the last part of the thesis, degrees of freedom calculations of the proposed retractable structures are considered and a theorem is proposed to prove that their degree of freedom is one. Throughout the thesis simulation and modelling technique is utilized for analysis of retraction and expansion.

Phd Degree / Doktora

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