Through arch bridge

Where simple arched bridges are used for railways on flat terrain the cost of building long approach embankments may be considerable.Flattening the arch shape to avoid the humpback problem, such as for Brunel's Maidenhead bridge, increases this side thrust.As well as tying the side-loads of the arch, the tension member is also at a convenient height to form the bridge deck, as for a through-arch.Although visually similar, tied- and untied- through-arch bridges are quite distinct structurally and are unrelated in how they distribute their loads.In some cases, this type of arch has been created by constructing cantilevers from each side, with the shoreside ends bolted securely down into heavy piers.This type of construction was used in the Sydney Harbour Bridge illustrated above, with the supporting cables to the higher side of the arches removed after completion.
The Pentele Bridge is an example of a basket handle arch. Seen from one end, the two arches take the form of a handle.
Brunel 's wrought-iron Windsor Railway Bridge : both a tied-arch and a through-arch
Stanley Ferry Aqueduct , Yorkshire, opened 1839, built in cast iron . A through-arch, but not a tied-arch
The Frederick Douglass Memorial Bridge under construction in 2020. The partially completed arch is supported by wires attaching it to the completed arch behind it.
The Runcorn–Widnes Bridge under construction in-between the Widnes–Runcorn Transporter Bridge and the lattice truss Runcorn Railway Bridge .
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