Author: Reece, Phillip O
First published: N/A
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Reece, Phillip O
Mr. Peter Mason (Member of Council), opening the discussion, said that he personally found the whole subject of immersed tube tunnels an extremely fascinating one. He was an engineer with a foot in both camps, both civil and structural. As a civil engineer he was very interested in tunnelling, but for the normal bored tunnel the part the structural engineer had to play was not quite so prominent as that of the mining and civil engineer. However, with the type of submerged tunnel that they had just been hearing about the structural engineer came into his own because the design of the tunnel sections was a completely structural problem.
This paper deals with the design of high flats where the height/base width ratio is such that limitation of deflection becomes the criterion in design. It discusses first of all the estimation of wind forces and a comparison with American practice. Both portal and cantilever methods of design are considered and the results of the cantilever method are compared with the results obtained from an exact computer analysis.