The use of hyperbolic paraboloids as a form of thin shell construction was pioneered in the post-war era, as a hybrid of modern architecture and structural engineering. These can either be formed using timber or steel sections, that are then clad, or they can be constructed using concrete. As a consequence they are commonly used to construct thin ‘ shell’ roofs. The fact that hyperbolic paraboloids are doubly-ruled means that they are easy to construct using a series of straight structural members. Horizontal sections taken through the surface are hyperbolic in format and vertical sections are parabolic. It is also a doubly-ruled surface, that is, every point on its surface lies on two straight lines across the surface. A hyperbolic paraboloid (sometimes referred to as ‘h/p’) is a doubly-curved surface that resembles the shape of a saddle, that is, it has a convex form along one axis, and a concave form on along the other.
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