The article on Twickenham Stadium (NCE 15 February), describes the Vierendeel girder and why it is used. This takes me back to the 1930s, when, for similar reasons, I designed one for the Bishopsgate City Police Station, a multi-storey steel framed building.
It fitted in between the rst and second oor levels to carry the whole of the upper part of the building, so providing a clear span over the ground oor.
It was a laborious job at that time, starting off with assumed sections, slope deection analysis, and sets of three simultaneous equations. Then make adjustments, and start again.
I wondered occasionally, when moment distribution became common, whether the building might have been treated as a whole.
Knowing nothing about computer design - all my work was with a 10 inch slide rule - I wonder how it would be tackled now.
Arthur Holt (F), 6 Pastures Green, Patrick Brompton, Bedale DL8 1LE