Difference To Nielsen-Lohse-Bridges
In Japan, tied arch bridges with crossing hangers are wrongly called Nielsen-Lohse bridge. Nielsen stands for the engineer Octavius F. Nielsen who applied for a patent on arches with tie and inclined hanger rods in 1926. This bridge type was then built about 60 times, primarily in Sweden. None of these bridges had crossed hangers.
Lohse stands for the German engineer Hermann Lohse (1815–1893) who developed a tied arch at late 19th century, whose tie is conversely curved to the arch. The bridge deck is supported by a third structural element hanging underneath.
Thus, it can be recognised that the name Nielse-Lohse is not correct for tied arches with inclined hanger crossing each other multiple times. Furthermore, the archetype of the Japanese network arches is the Fehmarnsund Bridge, Germany, which itself is based on the network arch idea.
The correct name of tied arch bridges with inclined hangers that cross each other at most once is Nielsen bridge. Tied arches with hangers with multiple intersections are network arch bridges. This strict rule is justified, because it leads to a more efficient structure.
Read more about this topic: Network Arch Bridge
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