%0 Conference Paper %1 akgun_proposal_2007 %A Akgün, Yenal %A Haase, Walter %A Sobek, Werner %B Shell and Spatial Structures: Structural Architecture - Towards the Future Looking to the Past, IASS Symposium, December 3-6, 2007, Venice, Italy %C Venice %D 2007 %I University IUAV of Venice %K actuators, adaptivity design lightweight minimization, optimization, principles, sobek structures, topology truss weight %T Proposal for a new scissor-hinge structure to create transformable and adaptive roofs %X When the current research on transformable structures is investigated, it can be seen that most examples do not offer truly flexible alternatives. Although certain parts of these structures do move, rotate or slide, the general shape of the roof never changes. These examples therefore do not constitute real form flexibility, despite the need for structures which can achieve a greater variety of form alternatives. The primary objective of this paper is to introduce a new adaptive roof structure which can meet this need and transform from planar geometries to hypersurfaces. To arrive at this adaptive roof structure, the present study considers the use of scissor-hinge elements combined with actuators. Scissor hinge structures possess unique extension and rotation capabilities, and the modified scissor unit developed herein greatly increases the form possibilities for the structure. This modified scissor unit differs from common scissor units in the addition of two joints at a specific point in the mechanism. With the development of this modified unit, it is possible to change the shape of the whole system without changing the dimensions of the struts or the span. The proposed scissor structure is two-dimensional, but it is also possible to combine structures in groups to create three-dimensional systems. This paper will however only discuss two-dimensional uses of the proposed structure. The development process of this modified scissor unit and its dimensional properties will first be introduced; the specific properties of the system such as general geometric principles will then be explained. Finally, basic calculation methods, transformation limits and roles of additional actuators will be discussed.

@inproceedings{akgun_proposal_2007, abstract = {When the current research on transformable structures is investigated, it can be seen that most examples do not offer truly flexible alternatives. Although certain parts of these structures do move, rotate or slide, the general shape of the roof never changes. These examples therefore do not constitute real form flexibility, despite the need for structures which can achieve a greater variety of form alternatives. The primary objective of this paper is to introduce a new adaptive roof structure which can meet this need and transform from planar geometries to hypersurfaces. To arrive at this adaptive roof structure, the present study considers the use of scissor-hinge elements combined with actuators. Scissor hinge structures possess unique extension and rotation capabilities, and the modified scissor unit developed herein greatly increases the form possibilities for the structure. This modified scissor unit differs from common scissor units in the addition of two joints at a specific point in the mechanism. With the development of this modified unit, it is possible to change the shape of the whole system without changing the dimensions of the struts or the span. The proposed scissor structure is two-dimensional, but it is also possible to combine structures in groups to create three-dimensional systems. This paper will however only discuss two-dimensional uses of the proposed structure. The development process of this modified scissor unit and its dimensional properties will first be introduced; the specific properties of the system such as general geometric principles will then be explained. Finally, basic calculation methods, transformation limits and roles of additional actuators will be discussed.}, added-at = {2023-11-27T15:10:57.000+0100}, address = {Venice}, author = {Akgün, Yenal and Haase, Walter and Sobek, Werner}, biburl = {https://puma.ub.uni-stuttgart.de/bibtex/2852ff5bc75ba1f7aee34435669f992e9/jmueller}, booktitle = {Shell and {Spatial} {Structures}: {Structural} {Architecture} - {Towards} the {Future} {Looking} to the {Past}, {IASS} {Symposium}, {December} 3-6, 2007, {Venice}, {Italy}}, interhash = {2cc1fe30e746a03a10e437fcccfe6d8c}, intrahash = {852ff5bc75ba1f7aee34435669f992e9}, keywords = {actuators, adaptivity design lightweight minimization, optimization, principles, sobek structures, topology truss weight}, publisher = {University IUAV of Venice}, timestamp = {2023-11-27T15:10:57.000+0100}, title = {Proposal for a new scissor-hinge structure to create transformable and adaptive roofs}, year = 2007 }