Proposal for a lowtech wooden space truss
Résumé
It is well known that wood is difficult to assemble; complex steel system is often used as technical solutions. The solution proposed in this paper is to limit the use of steel connection by using a specific shape of element to take the shear force and link the top and bottom layers of the space truss. The structure was designed by the laboratoire Navier/GSA, crafted and erected by the Compagnons du tour de France (fédération compagnonique), tested by the IUT (institute for higher technician) and sponsored by the laboratoire GSA and the company Wurth. The structure is 9 m by 9 m span and has a height of 1.5 m. The elements that link and brace the top and bottom layer are hyperboloids that are simply screwed; no complex steel assembly was required. The structure was tested under symmetric and asymmetric load. The deflections and a detailed of observation of the connection during loading was performed using photogrammetry. A dynamic analysis was also performed showing a natural frequency above 10 Hz. The behavior of the structure was then compared to the numerical model. Finally, the authors conclude on the economic and environmental aspects of such structures.
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