Technical Drawing - Exam Papers - Ordinary - 2006 - Building

Question 4

Shown are the outline plan of part of a roof over a football stadium.
It consists of two adjoining hyperbolic paraboloid surfaces ABCD and ADEF.
The corners A, B and F are 25m above ground level. Corners C and E are 50m above ground level and the corner D is 100m above ground level.

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

(b) Project an end elevation of the roof.

(c) Determine the true shape of the section S-S through the roof surface.

Scale 1 : 1000