Technical Drawing - Exam Papers - Ordinary - 2001 - Building

Question 4

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Fig. 4 shows the outline plan of a hyperbolic paraboloid roof surface ABCD. The roof perimeter is a square in plan. The corners B and D are at ground level, corner A is 7 m above ground level, and corner C is 11 m above ground level.

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

(b) Determine the curvature of the roof along a line joining B and D.

(c) Draw a new elevation of the roof which will show the true length of the edge AB.

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