The Longest Bridges in the World...

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The Longest Bridges in the World...




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Presentations text content in The Longest Bridges in the World...

Slide1

The Longest Bridges in the World...

Slide2

The Longest Bridges in the World…

Slide3

The Longest Bridges in the World

Have something in common

Slide4

Suspension Bridges

Slide5

Suspension Bridges

Efficient Structure b/c:

Slide6

Suspension Bridges

Efficient Structure b/c:

Most members in Tension

Main Cable in Tension

Suspenders in Tension

Slide7

Suspension Bridges

Efficient Structure b/c:

Most members in TensionFew members in Compression

Slide8

Suspension Bridges

Efficient Structure b/c:

Most members in TensionFew members in CompressionFew members in Bending

There are no bending

members in this view

Slide9

Suspension Bridges

Bending Member:

Girder Spans Between

Suspender Ropes

Slide10

Girder

Fill Beams

Slide11

Girder

Fill Beams

Slide12

Suspension Bridges

Bending Member:

Girder Spans Between

Suspender Ropes

Slide13

Suspension Bridges

Bending Member:

Girder Spans Between

Suspender Ropes

Slide14

Suspension Bridges

Other Characteristics

Slide15

Suspension Bridges

Other Characteristics:

Main Cable in Tension

Suspenders in Tension

Slide16

Suspension Bridges

Other Characteristics:

Demands HUGE Anchorage (Dead Weight)

Main Cable in Tension

Suspenders in Tension

Slide17

Suspension Bridges

Other Characteristics:

Demands HUGE Anchorage (Dead Weight)

Main Cable in Tension

Suspenders in Tension

W

W

Slide18

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

f

Slide19

Other Characteristics

The Suspended Structure is Unstable

Slide20

Other Characteristics

The Suspended Structure is Unstable

Stiffening trusses needed for stability and lateral stiffness

Slide21

Other Characteristics

Otherwise….

Stiffening trusses needed for stability and lateral stiffness

Slide22

Example

2:

The Brooklyn Bridge, Determine Main Cable Force Using Statics

Slide23

Example 2: The Brooklyn Bridge, Determine Main Cable Force Using Statics

2L = 1600’

h = 160’

Given:

w

=

9 kip/ft

Slide24

Slide25


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