Bridges
*Beam
Arch
Suspension
Bridges
Beam
*Arch
Suspension
Bridges
Beam
Arch
*Suspension
Forces Managed by Bridges
Compression
pushes inward or toward the object’s
center
Tension
pulling or stretching force
Beam Bridge
Valley Fair
Wild Thing
I Beam
Construction
Building the
Empire State
Building
Video
Wabasha Street Bridge
St Paul, Minnesota
Spanning the Mississippi
Cantilever deck truss
Beam Bridge
1890
PRATT
QUADRANGULAR
WARREN
CURVED CHORD
PRATT
SUBDIVIDED WARREN
TYPEs
BALTIMORE
PENNSYLVANIA(PRATT)
WARREN W/O VERTICAL
SUPPORTS
WARREN WITH VERTICAL
SUPPORTS
LATTICE
WHIPPLE
The Akashi-Kaikyo Bridge in Japan, world's longest span.
Kingston-Rhinecliff Bridge – under deck truss
Elbbrücke 1990 Tangermünde – above deck truss
Arch
Curve of idealized hanging chain when
supported at its ends.
Acted on only by its own weigh
Catenary Arch
Euler proved in 1744 that the
catenary is the curve which,
when rotated about the x-axis,
gives the surface of minimum
surface area (the catenoid) for
the given bounding circle.
http://mathworld.wolfram.com/Catenoid.html
Arch Bridge
• Semicircular structure
• Rigid span
• Curving upward between two points of
support
• Transfers the weight of the bridge and its load
partially into a horizontal thrust
• Horizontal thrust is restrained by the
abutments at either side
The Arkadiko Bridge in Greece
Built 13th century BC
One of the oldest arch bridges in existence
Stone Arch Roman Bridge of Córdoba, Spain.
Built in the 1st century BC
Stone arch bridge in Shaharah, Yemen
Central Park NY Pedestrian Bridge
The keystone is the most important stone in an
arch bridge, without this stone the arch would
collapse. The keystone holds the arch together.
Three-story Roman
Pont du Gard
Aqueduct
Gothic Arch
1. Construct AB.
2. Set compass to AB
3. With compass at point B,
construct arc AC.
4. With compass at point A,
construct arc BC.
Main portal
Notre Dame,
Paris
Juscelino Kubitschek Bridge in Brasilia, Brazil
Arch Suspension Hybrid Bridge
Suspension Bridge
Ted Talk
Suspension Bridge
•the force exerted is
uniform with respect to
horizontal distance
•the result is a parabola
Primitive suspension bridge over the River Astore
Cable supported bridge
How compelling is
the need of
humans to be
able to move
across their
world?
Tacoma Narrows Bridge
Gallopin’ Gertie
Draw Bridge
Double leaf bascule
Draw Bridge
Rolling lift bridge
Swing Bridge
Moveable
Swing: Government Bridge
Lock and Dam #15 Across Mississippi
Rotating Bridge of the
"rue Dieu" and Canal St Martin (Paris)
Gateshead Millenium Bridge
Gatehead
Magdeburg
Water Bridge
Falkirk Wheel
Falkirk Wheel