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There are There are three major three major types of types of bridges...bridges...3
3 Main3 Main BridgeBridge TypesTypes::
•Beam BridgeBeam Bridge•Arch Arch BridgeBridge•Suspension BridgeSuspension Bridge
The biggest difference between the three bridge
types is the distances they can each cross in a single
span.
The biggest difference between the three bridge
types is the distances they can each cross in a single
span.
A span is the distance between two bridge
supports.
A span is the distance between two bridge
supports.
Beam bridges usually Beam bridges usually cover relatively short cover relatively short
distances.distances.
Beam bridges usually Beam bridges usually cover relatively short cover relatively short
distances.distances.
As beam bridges are As beam bridges are lengthened, they need more lengthened, they need more
supporting piers.supporting piers.
As beam bridges are As beam bridges are lengthened, they need more lengthened, they need more
supporting piers.supporting piers.
But adding piers makes them But adding piers makes them unsuitable if a lot of space is unsuitable if a lot of space is needed underneath them.needed underneath them.
But adding piers makes them But adding piers makes them unsuitable if a lot of space is unsuitable if a lot of space is needed underneath them.needed underneath them.
Many elevated Many elevated roadways are beam roadways are beam
bridges.bridges.
Many elevated Many elevated roadways are beam roadways are beam
bridges.bridges.
A beam bridge spans short distances...
A beam bridge spans short distances...
…or beam bridges can be connected to cover
long distances.
Beam bridges Beam bridges must resist must resist
bending bending forcesforces
Beam bridges Beam bridges must resist must resist
bending bending forcesforces
A truss may be added to a beam to
help resist bending forces
A truss is a framework formed of triangles that
provide strength.
A truss is lightweight and allows wind to pass
through.
Often the truss is added to the top
of the beam
The angled piers of this beam bridge transfer its loads to the
ground.
A A Cantilever BeamCantilever Beam bridge has triangular bridge has triangular structures that weigh structures that weigh down each end of the down each end of the
beams.beams.
A A Cantilever BeamCantilever Beam bridge has triangular bridge has triangular structures that weigh structures that weigh down each end of the down each end of the
beams.beams.
Cantilever bridges are expensive, because they require a large amount of materials.
The Firth of Forth Cantilever BridgeScotland
Stone arch bridges have been built for thousands
of years.
Stone arch bridges cross short spans, and
compression helps them keep their
shape.
Arch bridges are also built with
steel.
Arch bridges are also built with
steel.
The steel arch structure provides
the strength for the span, and
allows the deck to hang below.
Smaller arches can be used as abutments.
An arch can also be anchored into a canyon,
and then the deck is placed on top.
Anchors placed in solid soil keep the base of the arch from spreading.
Anchors placed in solid soil keep the base of the arch from spreading.
Suspension Bridges are the most spectacular of
all.
The Tacoma Narrows Suspension Bridge.A Famous Engineering Failure.
The New Tacoma Narrows Bridges.
The Golden Gate Suspension Bridge
Notice the trusses under the deck that allow the wind to pass through.
The Golden Gate Suspension Bridge
Notice the trusses under the deck that allow the wind to pass through.
The Golden Gate Suspension Bridge Under Construction
Another kind of suspension bridge is a Cable-Stayed
Bridge.
Another kind of suspension bridge is a Cable-Stayed
Bridge.
The New Cable-Stayed Bridge in Boston.The Zakim Bunker Hill Bridge
A Cable-Stayed Bridge Under Construction.
Identify the parts of a suspension bridge: • Twin Towers • Main Cable • Cable Anchorages • Deck/Roadway • Suspenders • Tower Anchors
Identify these bridge types...
a. Suspension Bridgeb. Arch Bridgec. Beam Bridged. Cable-stayed Bridge
a. Suspension Bridgeb. Arch Bridgec. Beam Bridged. Cable-stayed Bridge
a. Suspension Bridgeb. Arch Bridgec. Beam Bridged. Cable-stayed Bridge
a. Suspension Bridgeb. Arch Bridgec. Beam Bridged. Cable-stayed Bridge
a. Suspension Bridgeb. Arch Bridgec. Beam Bridged. Cable-stayed Bridge
a. Suspension Bridgeb. Arch Bridgec. Beam Bridged. Cable-stayed Bridge
a. Suspension Bridgeb. Arch Bridgec. Beam Bridge
The End
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