Scissor-Hinged Deployable Structures Supported Perimetrally on Rectangular Bases

Abstract

Deployable bar structures on a rectangular base present the problems of closing the ends and longitudinal stabilization. Some proposals have been made to resolve them, mainly by creating mouths, but their application to composite geometries is problematic.<br/> On-the-bias deployable structures adequately solve both problems as they are supported around their entire perimeter, have a strong three-dimensional operation and only use load-bearing bars. The text analyses this type of deployable structures, their requirements and possibilities.<br/> A study on the combination of polar and translational units in a single deployable structure is then carried out, focusing on the study of on-the-bias deployable structures with perimeter polar modules that allow the effective height of the designs to be increased. Finally, the architectural possibilities of the system are studied, which make it possible to resolve overhangs, vertical openings in the roof, and T- or L-shaped ground plans, guaranteeing the modularity of the system.

Bias deployable grids with horizontal compound scissor-like elements: A geometric study of the folding/deployment process

“…For this reason, the combination of these structures with strips of SLEs around the perimeter that finish off the edges and improve the bracing – arranged at the starting level, at free edges and at the top – and also with perimeter polar SLEs that allow the roofing system to be separated from the ground. 2…”

“…As a result of this work, the bi-stable structures were developed, based on translational units, but which offer a significant improvement in structural behaviour as all the SLEs are load bearing, allow for support around the perimeter and reduce the number of elements to a minimum – only two different bars can be used to build a hipped roof – and resolve rectangular ground plans based on combinations of rectangles, thereby offering significant flexibility. 1,2 This text presents and develops new solutions for biased structures with bi-stable characteristics that provide greater stiffness and limit angular distortions.…”