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The planning and design procedures adopted for the hospital are reviewed having due regard for economy, speed of planning and construction, and the installation of the various services. Many of these services had not been finalized when detail drawings were being prepared for tender purposes. The structural design had thus to be sufficiently flexible in concept to avoid costly and time-consuming alterations for such services during construction.
A survey has been made of experimental data for the failure of concrete subjected to multiaxial stress systems varying from triaxial compression, through combinations of compression and tension to biaxial tension.
Mr. B. Rhodes: Mr. Longbottom has done less than justice to large diameter strand, by which I mean 28 mm (1 1/8 in) diameter strand. I know it is not used a lot, but this is really because of lack of effort on the part of the manufacturers and the system suppliers. 28 mm diameter strand has certain basic drawbacks, namely:
1. The shape of the load/extension curve
2. Relaxation losses at 6 per cent
3. Lower grip efficiencies
4. The tendency to fly open when cut
5. The 'banana' effect at the ends