Aerodynamic behaviour of hyperbolic paraboloid shaped roofs: Wind tunnel tests

The purpose of this research is to evaluate aerodynamic loads on large span hyperbolic paraboloid shaped roofs. This geometrical shape is specific to the design of tension roofs with a cable structure. The present study, however, consider a rigid roof structure so that the evaluation of the pressure coefficients for this particular geometrical shape is possible. Future studies will focus also on the analysis of the pressure coefficients variation that occurs with structural deformation. The parabolic shape selected is often used to build tension structures. These kinds of structures are light and characterized by innovative construction materials and technical elements such as air conditioning, lighting, etc. The design of tension roofs is always striving towards technological and structural innovation in order to build ever lighter structures to cover equally ever larger spans. Tension structures are in line with the new contemporary architectural concept of space, allowing for the construction of large open spaces where the flexibility and the modifiability of the structures in question are the most important prerequisites. They also meet the demand for structures that only need basic planned maintenance and can also withstand seismic pressure. In Italy, this constructive typology has so far been largely neglected and to a certain extent even ignored by building regulations. In fact no mandatory standards have been set for the design and construction of tension structures, except for temporary constructions. © Museo Ideale L. Da Vinci.