Trapezoidal structures

An architectural structure which is a shelter in which trapezoidal elements of a first set are interconnected in pleated relationship with trapezoid and pleat edges thereof coinciding,

• trapezoidal elements of a second set are interconnected in pleated relationship with trapezoid and pleat edges thereof coinciding and interfit in connected relationship with and extend transversely to said elements of said first set,
• each of said first-set-elements has a short base and a long base, an angled side which makes an acute angle with said long base at a vertex and an obtuse angle with said short base at another vertex, and said bases of all said first-set-elements are parallel and substantially vertical,
• said second-set-elements have first sides in common with said angled sides and have vertices, at the ends of said common sides, in common with said actute-and obtuse-angle vertices,
• said second-set-elements have bases which extend from said obtuse-angle vertices in a direction transverse to the first-set-element short bases,
• said first set, of elements, is arranged in an arc,
• said second set, of elements, extends radially from said arc to form a substantially horizontal canopy, cantilevered from said first set, in which said second-set-elements are in a warped, stressed non-planar smooth-curved condition,
• said structure having a substantially flat floor adjacent the lower portions of said first-set elements, said floor being secured to said structure so as to provide stability to said structure,
• polygonal elements of a third set are interconnected in pleated relationship with polygon and pleat edges thereof coinciding and interfit in connected relationship with said first set, of elements, and extend transversely to said elements of said first set,
• said third set-elements have first sides in common with second angled sides of said first-set-elements and have vertices, at the ends thereof, in common with acute-and obtuse-angle vertices of said first-set-elements,
• said third-set-elements have second sides which extend from said latter obtuse-angle vertices in a direction transverse to the first-set-element short bases and
• said third-set-elements underlie said floor.