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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 a
tensile member and inclined hanger rods in 1926. This bridge type was then built in
about 60 times, primarily in Sweden. Non of these bridges had crossed hangers.
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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 (see picture). 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 inlined hanger that cross each other at most once is
Nielsen bridge. Tied arches with hangers with mutliple intersections are network arch bridges.
This strict rule is justified, because
it leads to a more efficient structure.
More on this topic: "The Network Arch" by Per Tveit
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