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The Longest Bridges in the World... The Longest Bridges in the World...

The Longest Bridges in the World... - PowerPoint Presentation

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Uploaded On 2018-11-10

The Longest Bridges in the World... - PPT Presentation

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

suspension bridges characteristics tension bridges suspension tension characteristics cable main members structure girder bending suspenders efficient ropes member suspender

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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