Abstract: The invention relates to a support (12) for an erectable structure (10), in particular a canopy for a grandstand seating platform (98). The support (12) includes a pliable elongate main member in the form of a frame (26); a plurality of compression legs in the form of A-frames (28) mounted to the frame (26); restraint means in the form of tension wires (30) connected between the A-frames (28) and the frame (26); and an elongate tensionable element in the form of a cable (32). The support (12) is movable between a collapsed and an erect position by pivoting the support (12) about a pin joint (100), through which it is coupled to the seating platform. In a preferred embodiment, a structure 10r comprises three such supports (12r) coupled by purlins (16r) and including membranes (14r) to define a grandstand canopy.

Abstract: A structural supporting truss (12) comprises an elongate rib (14) of resilient material connected to a web (16) of fabric material. The rib (14), in use, is elastically deformed to adopt a curved shape. The web (16) extends radially inwardly of the rib (14) along its length, the web (16) acting in tension to retain the rib (14) in its curved condition. The rib (14) may be made of a plurality of segments interconnected by hinges. The web (16) may comprise a plurality of panels (20). The rib (14) is subject to a compressive force. A remarkably stiff truss structure is formed such as may be used as a supporting truss for a tent of like shelter structure.