*Beam

ArchSuspension

Bridges

BridgesBeam*Arch

Suspension

BridgesBeamArch

*Suspension

Forces Managed by Bridges

Compression pushes inward or toward the

object’s center

Tensionpulling or stretching force

Beam Bridge

I Beam Construction

Building the Empire State Building

Valley Fair Wild Thing

Video

Wabasha Street BridgeSt Paul, Minnesota

Spanning the MississippiCantilever deck truss

Beam Bridge1890

http://upload.wikimedia.org/wikipedia/commons/1/16/Wabasha_Street_Bridge,_Spanning_Mississippi_River_at_Wabasha_Street,_Saint_Paul_(Ramsey_County,_Minnesota).jpg

PRATT

CURVED CHORDPRATT

BALTIMORE

PENNSYLVANIA(PRATT)

WARREN W/O VERTICALSUPPORTS

WARREN WITH VERTICALSUPPORTS

QUADRANGULAR WARREN

SUBDIVIDED WARRENTYPEs

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

Catenary Arch Curve of idealized hanging chain when supported at its ends.Acted on only by its own weigh

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 GreeceBuilt 13th century BCOne 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

Main portal Notre Dame, Paris

1. Construct AB.2. Set compass to AB3. With compass at point B,

construct arc AC. 4. With compass at point A,

construct arc BC.

Juscelino Kubitschek Bridge in Brasilia, BrazilArch Suspension Hybrid Bridge

Ted Talk

Suspension Bridge

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 BridgeDouble leaf bascule

Draw BridgeRolling lift bridge

Swing BridgeMoveable

Swing: Government BridgeLock and Dam #15 Across Mississippi

Rotating Bridge of the "rue Dieu" and Canal St Martin (Paris)

GateheadGateshead Millenium Bridge

Falkirk Wheel

Magdeburg Water Bridge

Falkirk Wheel