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Research Papers

Geometric Design and Construction of Structurally Stabilized Accordion Shelters

[+] Author and Article Information
Ting-Uei Lee

School of Civil Engineering,
University of Queensland,
St. Lucia, QLD 4072, Australia

Joseph M. Gattas

Lecturer
School of Civil Engineering,
University of Queensland,
St. Lucia, QLD 4072, Australia
e-mail: j.gattas@uq.edu.au

1Corresponding author.

Manuscript received July 1, 2015; final manuscript received December 24, 2015; published online March 7, 2016. Assoc. Editor: Mary Frecker.

J. Mechanisms Robotics 8(3), 031009 (Mar 07, 2016) (8 pages) Paper No: JMR-15-1174; doi: 10.1115/1.4032441 History: Received July 01, 2015; Revised December 24, 2015

Accordion patterns are widely used for deployable shelters, due to their simple construction, elegant deployment mechanism, and folded plate form with an inherent structural efficiency. This paper proposes two new accordion-type shelters that use modified geometries to improve on the structural stability and stiffness of the typical accordion form. The first shelter is termed a distributed frame accordion shelter and is generated by separating fully folded accordion frames between spacer plates aligned with the transverse direction. A transverse stiffness and increased flexural rigidity can therefore be achieved while maintaining a nonzero floor area. The second shelter is termed a diamond wall accordion shelter and is generated by inserting secondary wall elements that increase wall sectional depth and counteract the coupled rotational-transverse displacements at accordion roof–wall junctions. For both shelter types, a geometric parameterization and a full-scale prototype are presented. Good correlation is seen between the designed and constructed surfaces. A numerical investigation also shows that the new forms have substantially increased flexural rigidities compared to the typical accordion form.

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Figures

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Fig. 1

Parametric definition of accordion shelter: (a) crease pattern and (b) folded surface

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Fig. 2

From top to bottom: folded accordion-type shelter, roof cross section, and wall cross section. (a) Typical accordion shelter, (b) distributed frame accordion shelter, and (c) diamond wall accordion shelter.

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Fig. 3

Parameterization of distributed frame accordion shelter: (a)–(f) surface to crease pattern translation and (g) and (h) example forms

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Fig. 4

Parameterization of diamond wall accordion shelter: (a)–(c) accordion to diamond wall transition, (d)–(f) elevation views of above, (g) crease pattern, and (h) example form

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Fig. 5

Prototype pieces arranged on 2400 × 1200 Corflute sheet. Left: distributed frame and right: diamond wall.

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Fig. 6

Left: distributed frame prototype and right: simulated frame deployment

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Fig. 7

Left: diamond wall prototype and right: simulated frame deployment

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Fig. 8

(a) Normalized values of IL for investigated shelter types. (b) Example wall cross sections for shelter types with D = 800 mm.

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