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Geometric Formation of Foldable Latticed Structures and the Mechanical Performance

Author: SunCongJun
Tutor: WuYue
School: Harbin Institute of Technology
Course: Structural Engineering
Keywords: Folded structure Shear hinge unit Geometric form Mechanical Properties
CLC: TU399
Type: Master's thesis
Year: 2007
Downloads: 106
Quote: 3
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Abstract


Folded structure of the 1960s developed a new type of spatial structure , the structure with start folding away when not in use . Due to the small size, folded , folded structure , expand convenience , while more and more attention , and gradually applied to the building and aerospace fields . Engineering applications in the field of architecture is still very rare in the country , there is a need to expand the research . In this paper, the study of the folding grid (including the the folded grid mesh shell ) structure common folding structure in the field of architecture , and are used for temporary or semi-permanent buildings . The folded structure design including geometric fold development process design and expansion location by Dutch analysis of two parts , including geometric design is the basis of structural design . In this paper, first folded geometric grid structure constitute . Geometric design for the outer locking folding structure ( this study ) is to ensure that the structure ( essentially institutional ) can freely fold exhibition . Through the study of the geometric properties of the folded structure of the basic unit - three shear rod shear hinge unit derived shear hinge unit geometric properties and geometric constraints ensure structural fold exhibition performance , and specific use of shear hinge unit go to the folding grid , reticulated shells . Specific types of folding grid , mesh shell fold exhibition in ANSYS dynamic simulation demonstrated its malleability . The folded structure commenced after forming , the mechanical properties of the main content of this study . Through the analysis of a large number of examples , summarizes the height of the grid , the grid size changes influence of structural mechanical properties . The the scissor hinge unit characteristics , folding mesh structure mainly rely on the rod bending stress to resist the external load moment , resulting in poor structural stiffness . Draw on a common grid , network shell stress mechanism , various forms of folding grid mesh shell plus chord or bottom chord or plus lower chord at the same time , to analyze their impact on the mechanical properties of the law , by analyzing and comparing the various structural a reasonable improvement program , applied to engineering practice . This article concludes the various nodes in the form of a folded structure , analyze their strengths and weaknesses in order to better use in practice .

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