Technical Drawing - Exam Papers - Higher - 2000 - Building

Question 6

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Fig. 5 shows the outline plan and elevation of a roof. The hyperbolic paraboloid surfaces ABEF and BCDE are extensions of the smaller hyperbolic paraboloid surfaces AHGF and CDGH, respectively. The roof perimeter is
a regular hexagon in plan.

(a) Draw the given plan and elevation and project an end elevation.

(b) Determine the curvature of the roof along a line from A to D.

(c) Determine the traces of the plane director for the edges AH and FG of the surface AHGF and having its horizontal trace passing through A.

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