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Girder question

Letters

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

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