The Longest Bridges in the World The Longest Bridges in the World Have something in common Suspension Bridges Suspension Bridges Efficient Structure bc Suspension Bridges Efficient Structure bc ID: 727335
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Slide1
The Longest Bridges in the World...Slide2
The Longest Bridges in the World…Slide3
The Longest Bridges in the World
Have something in commonSlide4
Suspension BridgesSlide5
Suspension Bridges
Efficient Structure b/c:Slide6
Suspension Bridges
Efficient Structure b/c:
Most members in Tension
Main Cable in Tension
Suspenders in TensionSlide7
Suspension Bridges
Efficient Structure b/c:
Most members in TensionFew members in CompressionSlide8
Suspension Bridges
Efficient Structure b/c:
Most members in TensionFew members in CompressionFew members in Bending
There are no bending
members in this viewSlide9
Suspension Bridges
Bending Member:
Girder Spans Between
Suspender RopesSlide10
Girder
Fill BeamsSlide11
Girder
Fill BeamsSlide12
Suspension Bridges
Bending Member:
Girder Spans Between
Suspender RopesSlide13
Suspension Bridges
Bending Member:
Girder Spans Between
Suspender RopesSlide14
Suspension Bridges
Other CharacteristicsSlide15
Suspension Bridges
Other Characteristics:
Main Cable in Tension
Suspenders in TensionSlide16
Suspension Bridges
Other Characteristics:
Demands HUGE Anchorage (Dead Weight)
Main Cable in Tension
Suspenders in TensionSlide17
Suspension Bridges
Other Characteristics:
Demands HUGE Anchorage (Dead Weight)
Main Cable in Tension
Suspenders in Tension
W
WSlide18
Suspension Bridges
Other Characteristics:
Demands HUGE Anchorage (Dead Weight)(Sliding Resistance Must Exceed Cable Force)
Main Cable in Tension
Suspenders in Tension
W
W
N
N
f
fSlide19
Other Characteristics
The Suspended Structure is UnstableSlide20
Other Characteristics
The Suspended Structure is Unstable
Stiffening trusses needed for stability and lateral stiffnessSlide21
Other Characteristics
Otherwise….
Stiffening trusses needed for stability and lateral stiffnessSlide22
Example
2:
The Brooklyn Bridge, Determine Main Cable Force Using StaticsSlide23
Example 2: The Brooklyn Bridge, Determine Main Cable Force Using Statics
2L = 1600’
h = 160’
Given:
w
=
9 kip/ft