Bridges presentation
Its design was
motivated by the Tay Bridge disaster. About 54,000 tons of Siemens-Martin open-hearth steel were
required for the 1710ft (521m) cantilever spans whose main compression struts of rolled steel plate
were riveted into 12ft (4m) diameter tubes. Another authority on the effects of wind on structures
was Gustav Eiffel, who conducted similar experiments in France prior to designing another of the
world's great arch bridges, the 541ft (165m) Garabit Viaduct (1885) in the windy valleys of the
Massif Central, though he held to wrought iron, not being convinced of the efficacy of the new
material.
Steel arches of enormous span were built during the first few decades of the 20th century. One of the
greatest is the Hell Gate Bridge in the USA (1917), a two-hinged trussed arch, the top chord of
which serves as part of a stiffening truss. Designed by Gustav Lindenthal to span the Hell Gate at
annaabi.ee 
