No 2 Bridge

Today was back down in the central belt on Business, leaving at 5am. So this on the way back via Dundee.

The Tay Bridge disaster occurred during a violent storm on 28 December 1879 when the first Tay Rail Bridge collapsed while a train was passing over it from Wormit to Dundee, killing all aboard. The bridge – designed by Sir Thomas Bouch – used lattice girders supported by iron piers, with cast iron columns and wrought iron cross-bracing.

The piers were narrower and their cross-bracing was less extensive and robust than on previous similar designs by Bouch. Bouch had sought expert advice on "wind loading" when designing a proposed rail bridge over the Firth of Forth; as a result of that advice he had made no explicit allowance for wind loading in the design of the Tay Bridge. There were other flaws in detailed design, in maintenance, and in quality control of castings, all of which were, at least in part, Bouch's responsibility.
Bouch died within the year, with his reputation as an engineer ruined.

Future British bridge designs had to allow for wind loadings of up to 56 pounds per square foot (2.7 kPa). Bouch's design for the Forth Rail Bridge was not used.