A unique aspect of the construction procedure was to assemble the roof's frame on the ground and to lift it up by means of hydraulic jacks, fixed to the top of the four corner pylons (see Fig. 4.11). In January 1973 the roof, now in its final position, but not yet burdened by the weight of the roof deck, was measured to have a deflection at the centre twice that predicted by the computer analysis. How did the engineers justify their lack of concern, and would you expect this to be the situation today when analysing the same problem by computer analysis (F & A)? 4

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