Bridge slideshownew

Click mouse to advance each slide.

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