Deployable bundle modulus structures with reciprocal linkages for emergency buildings: Fid-Bau Portal

Deployable bundle modulus structures with reciprocal linkages for emergency buildings

Pérez-Valcárcel, J. / Muñoz-Vidal, M. / Suárez-Riestra, F. / López-César, Isaac R. / Freire-Tellado, M.J.

Highlights • A new design is proposed for deployable structures with bundle modules, using reciprocal linkages at the ends of the bars. • Reciprocal linkages reduce deformations in expandable beam structures. • Reciprocal linkages reduce the bending moments on the bars allowing for smaller sections. • The use of reciprocal linkages makes the eccentricities at all three nodes nearly equal. • The use of reciprocal linkages avoids the use of broken bars. • Calculations consider eccentricities and embedment in end linkages. • The experimental results show good accuracy with those calculated with the proposed method.

Abstract Deployable structures are an ideal solution for emergency buildings because of their lightness and compactness, allowing them to be transported to wherever they are needed. Generally the most frequent solutions use Scissor-like-Elements (SLE), but in this case the use of bundle modules is proposed. These systems were developed by Pérez Piñero, but have hardly been used since then. The article analyses the problems they present, as well as their advantages in reducing the number of bars and linkages required, which allows for the design of simpler and more economical structures. The geometrical and mechanical conditions of the linkages for triangular and square modules are analysed, as well as the typologies that may arise. A calculation method is also developed to analyse this type of structure. Finally, the performance of a flat grid is analysed in an analytical and experimental way using reciprocal links at its ends. Both theoretical calculations and experimental tests allow us to demonstrate the viability and efficiency of this new type of structure.