Education and Training for the Design Office

The paper describes the design development of the roof from simple circular arches of 340 ft-span to a double curved concrete shell of 235 ft-span held between fanned raking struts providing a total span between abutments of 324 ft. Reference is made to special problems in design, particularly that of secondary stresses due to shortening, and the various contributing factors are discussed in detail together with the reasons for adopting post-tensioning in the foundation ties and in the roof. Site works are described with emphasis placed on the somewhat unusual problems and difficulties of post-tensioning operations in stressing and grouting the 380 ftlong tie beams and the 230 ft-long curved roof tendons. Thomas Harley Haddow

'I should be less than human if I did not, first, express to you my personal feelings of pride mixed with humility at being installed your President this evening. Pride in being chosen to occupy the highest office this great Institution can offer any of its members at a time when its prestige and usefulness to mankind has never been higher; and humility because I am not only aware of the outstanding men who have, for nearly 60 years, preceded me, but also very conscious of the considerable ability and often brilliance of many of our members who are today actively engaged in the profession of structural engineering.' Brian Scruby