Source: http://www.leisureandculturedundee.com/
Was stormy weather ever the main cause of an
epic bridge collapse? Yes it was.
The first Tay Rail
Bridge at Dundee was a cast iron bridge that collapsed on 28 December 1879. The
collapse occurred when a train passed over it during an aggressive stormy
weather. This tragedy caused 75 deaths. There were two main reasons that lead
to its collapse.
One reason was the poor material quality control
and maintenance of the cast iron columns and wrought iron strut and tie bracing
system. The iron piers were also more slender than they should be.
Another reason was that the designer Bouch did not include adequate wind
loading during the design of the bridge. Bouch did sought advice given by well-known engineers,
in which wind pressures as high as 40 psf might
occur locally but wind pressures of 10 psf can be allowed for the design. However, the storm that
lead to the collapse of the Tay Rail
Bridge was estimated to have a Beaufort
force of around 10/11. The gale force led to the failure of the lateral
stability of the cross bracing system and its connections.
After the collapse, the Tay Rail Bridge was replaced by steel construction.
The building of the Tay Rail
Bridge led to Bouch being
knighted. But after it collapsed, his
reputation was forever ruined. Wind loading in design is ever so important. So
sad!