Abstract: A door system for a stressed fabric structure comprising a stationary arched anchor beam, the ends of which are supported on the base at one end of the structure, a plurality of movable arched beams of similar size and shape on the side of the anchor beam away from the structure and having supporting ends pivotally secured at the ends of the anchor beam, the movable beams to pivot along the same radial path about common pivot points at the ends, between raised, open position adjacent to the anchor beam and closed position in which the beams are spaced progressively from the anchor beam to the structure base. Fabric panels are secured to and extend between each of the anchor beam and its adjacent movable beam and adjacent pairs of movable beams so as to be under similar tension when the beams are in closed position.