Bridges presentation
men sitting on chairs with outstretched arms and sticks supporting Kaichi Watanabe, a visiting
engineering student from Japan, sitting on a board, representing the fixed piers, cantilevers, and
suspended span. To ensure that there was no repeat of the Tay disaster, Baker conducted a series of
tests, gauging wind at several sites in the area over a two-year period, arriving at a design pressure
of 56lb/ft2 (274kg/m2), which was considerably in excess of any load the bridge would ever sustain.
Each of the two main spans of the bridge consists of two 680ft (207m) cantilevers with a 350ft
(107m) suspended span for a total length of 1,710ft (521m). John Fowler and Benjamin Baker
designed the Forth Bridge (1890) to resist wind loads 5.5 times those that toppled the Tay Bridge
(Figure 20).
The Forth Bridge's record was broken in 1917 when the Québec Bridge was finally completed,
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