Arch Bridges

1
Arch Bridges

• Turner Crane
• Arch Bridges are the oldest type of bridges after
  the girder bridges.
• There are four basic types of arch bridges
• Hinge-less
• Two-hinge
• Three Hinge
• Tied Arches
• Force is pushed out along the curve of the arch
  towards the abutments.

2
Hinge-less Bridge- Allows No Rotation at
Foundations, Only Built at Very Sturdy Locations
Because of Force Placed on the Foundations

• Two-Hinge Bridge- Forces generated at the hinged
  bearings, most commonly used type, generally the
  most economical

Three Hinge- Contains an extra hinge at top of
arch, suffers very little if movement in the
foundations due to earthquakes, sinking, etc.,
Rarely used in recent times
Tied Arches- used in places where the ground is
not strong enough to support the horizontal
forces, to alleviate the horizontal pressure the
girder ties both ends of the arch together
3
Pont du Gard

• Built in 19 B.C. in Nimes, France
• Length- 273 meters
• Height- 49 meters
• Built to supplement Nimes water supply
• The arches were constructed of uncemented masonry
• Most of the aqueduct is built underground and has
  a slight drop of 1 in 3000 feet, by adding the
  drop they were able to use the natural
  gravitational flow and pressure systems were not
  needed.
• There are 6 arches in the lowest story, 11 in the
  second story and 36 in the top level.

4
URLs

• http//richmangalleries.com/arch_bridges.htm
• http//www.matsuo-bridges.com.jp/english/bridges/b
  asics/arch.shtm
• www.howstuffworks.com/bridge3.htm
• http//wings.buffalo.edu/AandL/Maecenas/France/Pon
  t_du_Gard/ac821331.html
• http//www.chch.school.nz/mbc/pontdu.htm
• PICTURES USED
• Bayonne Bridge, Bayonne Bridge, New Jersey
• Tacony-Palmayra Bridge, Palmayra New Jersey
• Pont du Gard
• Francis Scott Key Bridge, Washington, D.C.