Suspension Bridges.

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Presentation transcript:

Suspension Bridges

Suspension Bridges Efficient Structure b/c:

Suspension Bridges Efficient Structure b/c: Most members in Tension Main Cable in Tension Efficient Structure b/c: Most members in Tension Suspenders in Tension

Suspension Bridges Efficient Structure b/c: Most members in Tension Few members in Compression

Suspension Bridges Efficient Structure b/c: Most members in Tension Few members in Compression Few members in Bending There are no bending members in this view

Suspension Bridges Bending Member: Girder Spans Between Suspender Ropes

Fill Beams Girder

Fill Beams Girder

Suspension Bridges Bending Member: Girder Spans Between Suspender Ropes

Suspension Bridges Bending Member: Girder Spans Between Suspender Ropes

Suspension Bridges Other Characteristics

Suspension Bridges Other Characteristics: Main Cable in Tension Suspenders in Tension

Suspension Bridges Other Characteristics: Main Cable in Tension Other Characteristics: Demands HUGE Anchorage (Dead Weight) Suspenders in Tension

Suspension Bridges Other Characteristics: W W Main Cable in Tension Other Characteristics: Demands HUGE Anchorage (Dead Weight) W W Suspenders in Tension

Suspension Bridges Other Characteristics: W W Main Cable in Tension Other Characteristics: Demands HUGE Anchorage (Dead Weight) (Sliding Resistance Must Exceed Cable Force) W W Suspenders in Tension f N f N

Other Characteristics The Suspended Structure is Unstable

Other Characteristics The Suspended Structure is Unstable Stiffening trusses needed for stability and lateral stiffness

Other Characteristics Otherwise…. Stiffening trusses needed for stability and lateral stiffness

Example 1: The Brooklyn Bridge, Determine Main Cable W Using Statics

Example 1: The Brooklyn Bridge, Determine Main Cable W Using Statics Given: w = 9 kip/ft h = 160’ 2L = 1600’

Example 1: The Brooklyn Bridge, Determine Main Cable W Using Statics Also Given: Main Cable Ultimate Strength Fu = 160 ksi Cable A = 600 in2 Given: w = 9 kip/ft h = 160’ 2L = 1600’

Example 1: The Brooklyn Bridge, Determine Main Cable W Using Statics Also Given: Main Cable Ultimate Strength Fu = 160 ksi Cable A = 600 in2 => Pn = (160)(600) = 96000 kips Given: w = 9 kip/ft h = 160’ 2L = 1600’