Issue 2

Explicit expressions for the local buckling of a generally imperfect, simply supported plate are used to develop a simple method for the design of thin-walled beams. Comparison with test results for lipped-channel beams shows that the method gives good agreement with both collapse asymmoments and elastic deflexions. R.G. Dawson and A.C. Walker

In this paper comparisons are drawn between the various techniques employed in the two basic systems of submerged tube tunnel construction and conclusions are drawn on the relative merits of these methods. Tables giving details of existing submerged tube tunnels are included. The selection of the cross-section shape and the structural design of the tunnel are considered and a number of special structural problems are discussed including foundation design and the jointing of tunnel units. Temporary works are also reviewed and particularly the effect of forces on tunnel units during the handling and sinking operations and the problems of integrating the normal design and construction duties. Alternative methods of fabricating the tunnel units either in a casting basin or on a slipway are compared. G.M.J. Williams and K.W. Innes

The paper describes the design and construction of the 330 m (1084 ft) high television tower built for the Independent Television Authority at Emley Moor in Yorkshire. A.J.J. Bartak and M. Shears