Dating bridges


06-Nov-2019 06:13

Designs of bridges vary depending on the function of the bridge, the nature of the terrain where the bridge is constructed and anchored, the material used to make it, and the funds available to build it.Most likely the earliest bridges were fallen trees and stepping stones, while Neolithic people built boardwalk bridges across marshland.The first wooden footbridge led across Lake Zürich, followed by several reconstructions at least until the late 2nd century AD, when the Roman Empire built a 6-metre-wide (20 ft) wooden bridge.Between 13, Rudolf IV, Duke of Austria, built a 'new' wooden bridge across the lake that has been used to 1878 – measuring approximately 1,450 metres (4,760 ft) in length and 4 metres (13 ft) wide.Rope bridges, a simple type of suspension bridge, were used by the Inca civilization in the Andes mountains of South America, just prior to European colonization in the 16th century.During the 18th century there were many innovations in the design of timber bridges by Hans Ulrich Grubenmann, Johannes Grubenmann, and others.It is constructed for the purpose of providing passage over the obstacle, usually something that can be detrimental to cross otherwise.There are many different designs that each serve a particular purpose and apply to different situations.

Although open spandrels offered economy of material (less dead load) in comparison to closed spandrels, they also required more complicated formwork and were thus best suited to long-span crossings where a graceful yet powerful bridge was desired and the economy of material could be used to best advantage.

The first book on bridge engineering was written by Hubert Gautier in 1716.



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