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A brief study of bridges

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In the 18th and 19th century many bridges were covered ... It spans the Golden Gate Strait. year. Country. Span (m) Bridge. No. 1957. USA. 1158. Mackinac ... – PowerPoint PPT presentation

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Title: A brief study of bridges


1
A brief study of bridges
2
We build different bridges for different needs
3
Covered Bridge
4
Covered Bridges
In the 18th and 19th century many bridges were
covered
5
Covered Bridges
Why do you think these bridges were covered?
6
Covered Bridges
Some say it was for protection from a sudden storm
7
Covered Bridges
Some say to keep horses from shying at the sight
of rippling water
8
Covered Bridges
Some say to provided a romantic setting for a hug
or kiss
9
Covered Bridges
However
10
Covered Bridges
The real reason was to protect the timber from
the effects of rain and snow 
11
Beam Bridge
12
Beam Bridge
The simplest and least expensive
Beam Sometimes called a girder
13
Beam Bridge
Can be made of steel
14
Beam Bridge
Concrete
15
Beam Bridge
or even wood
16
Beam Bridge
Not the best for long or high spans
17
Suspension Bridge
18
Suspension Bridge
Better for Long spans
More Majestic
19
First suspension bridge in America Newburyport,
Mass.
Built around 1900
20
Golden Gate Bridge Perhaps the most famous bridge
in the world
Why is it called the Golden Gate?
21
Golden Gate Bridge Perhaps the most famous bridge
in the world
It spans the Golden Gate Strait
22
The worlds 10 longest spans are all suspension
bridges
23
Arch Bridge
24
Arch Bridge
Very strong
Can last a very long time
25
Arch Bridge
This is Pont du Gard a 2000 year old Roman
aqueduct
26
Arch bridge
This is a bridge built so that a stream of water
could cross a stream of water
27
Cable Stayed Bridge
28
Cable Stayed bridge
Long spans
Elegant structure
29
Sunshine Skyway BridgeSt. Petersburg, FL
Requires Less labor
Requires less material
30
Sunshine Skyway BridgeSt. Petersburg, FL
Similar to Clark bridge in Alton, IL
31
Lift Bridge
32
Lifting Bridge
Do you know the name of this bridge?
33
Lifting Bridge
It is not London Bridge.
34
Lifting Bridge
Tower Bridge
It is over 100 years old
35
Truss Bridge
36
Truss Bridge
A truss can support from above
37
Truss Bridge
A truss can also support from below
38
Truss Bridge
What do you know about this bridge?
39
Eads BridgeSt. Louis, MO
Completed in 1874
American masterpiece
40
A quick review
41
Covered Bridges
Makes use of local building supplies
42
Covered Bridges
Interior truss makes it stronger than wood beam
bridge
43
Covered Bridges
Covering the timbers makes them last longer
44
Beam Bridge
Easiest to build
Least expensive design
45
Cable Stay Bridge
Less expensive to build than suspension bridges
46
Cable Stay Bridges
Uses less material than suspension bridge
47
Cable Stay Bridges
They look cool!
48
Cable Stay Bridges
Requires the use of more modern materials
49
Suspension Bridges
Longest unsupported spans
50
Suspension Bridges
They look pretty cool too!
51
Arched Bridges
Strong
Durable
Ancient/low tech building materials
Labor intensive
52
Truss Bridge
Stronger than beam bridge
Think Vectors!
53
Truss Bridge
Can bridge longer unsupported spans than a beam
bridge
54
Lifting Bridge
Blocks trafic
55
Lifting Bridge
Allows the passage of ships
56
Lifting Bridge
Rather expensive
Subject to mechanical breakdown
57
Many different bridges for many different jobs
58
See these websites for more information on bridge
design
http//www.howstuffworks.com/bridge.htm http//ww
w.pbs.org/wgbh/nova/bridge/ http//myron.sjsu.edu
/romeweb/engineer/art2.htm http//www.bardaglea.o
rg.uk/bridges/welcome.html http//education.sdsc.
edu/enrich/downloadables/bridges.pdf http//www.t
fhrc.gov/pubrds/summer95/p95su23.htm
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