Technical Drawing - Exam Papers - Higher - 1997 - Building

Question 6

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Fig. 5 shows the outline plan of a roof which contains five hyperbolic paraboloid roof surfaces. The roof perimeter is square in plan. The corners A, B, C and D are at ground level, corners G and E are 12 m above ground level and corners F and H are 1 6m above ground level.

(a) Draw the given plan of the hyperbolic paraboloid surfaces ABEF and EFGH and project an elevation.

(b) Show the curvature of the roof along a line joining G to B.

(c) Determine the traces of the plane director for the edges AF and BE of the surface ABEF and having its horizontal trace passing through B.

Scale 1: 200

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