News:

Thanks to everyone for the feedback on what errors you encountered from the forum database changes made in Fall 2023. Let us know if you discover anymore.

Main Menu

Bridges with cables that drop below road deck

Started by roadman65, December 04, 2015, 12:55:52 PM

Previous topic - Next topic

roadman65

I was noticing that on the Bear Mountain Bridge in New York that the cables drop below the roadway.  I have seen that design before on some other suspension bridges as well.  To me that seems kind of weird that they would construct the bridge this way being that its all to be suspended from below the cables from suspenders.

Not only that but it increases the load as the cables themselves are supporting the truss that houses the bridge's deck.  The whole roadway is being held in place from the cables below it instead of above it which does not allow the give that having it suspended above has such as when the bridge sways in the wind etc.
Every day is a winding road, you just got to get used to it.

Sheryl Crowe


Jardine

Brooklyn Bridge would be the 'classic' example.

SteveG1988

Roads Clinched

I55,I82,I84(E&W)I88(W),I87(N),I81,I64,I74(W),I72,I57,I24,I65,I59,I12,I71,I77,I76(E&W),I70,I79,I85,I86(W),I27,I16,I97,I96,I43,I41,

Jardine

Quote from: SteveG1988 on December 05, 2015, 10:41:34 PM
Riegelsville Bridge in NJ/PA.

wow!

From what I've read about the San Francisco/Oakland Bay Bridge suspension spans, I wasn't aware anyone had tried a multispan suspension bridge without intermediate anchorage(s).

Wonder how asymmetrically that one could be loaded and not fail ??

SteveG1988

Roads Clinched

I55,I82,I84(E&W)I88(W),I87(N),I81,I64,I74(W),I72,I57,I24,I65,I59,I12,I71,I77,I76(E&W),I70,I79,I85,I86(W),I27,I16,I97,I96,I43,I41,


Jardine

#6

Jardine

#7
{couldn't get pick to post, check out cable sag near anchorages on the Brooklyn Bridge}

{nevermind, figured it out}

BrianP

Well any suspension bridge will have the cables go below the road deck near the anchorages  since the anchorages are below the road.  I think the original point was geared more towards mid span.

Jardine

#9
These drop down and head back up, it's really an interesting feature.

Totally unlike, for example, the Golden Gate.


Rothman

Quote from: SteveG1988 on December 07, 2015, 09:15:09 AM
Robeling Aqueduct over the delaware river.

Really?  The deck actually sits far below the top trusses.

Drove across it myself. :D
Please note: All comments here represent my own personal opinion and do not reflect the official position(s) of NYSDOT.

Jardine

How does it even occur to someone to make an aqueduct with a suspended span ??

  :biggrin:

SteveG1988

Quote from: Rothman on December 09, 2015, 02:30:26 PM
Quote from: SteveG1988 on December 07, 2015, 09:15:09 AM
Robeling Aqueduct over the delaware river.

Really?  The deck actually sits far below the top trusses.

Drove across it myself. :D
Quote from: Jardine on December 09, 2015, 11:03:02 PM
How does it even occur to someone to make an aqueduct with a suspended span ??

  :biggrin:

I was wrong, i thought they went way below instead of just to the deck.



And It was made as a suspension span as a way to prove Robeling's Wire Rope.
Roads Clinched

I55,I82,I84(E&W)I88(W),I87(N),I81,I64,I74(W),I72,I57,I24,I65,I59,I12,I71,I77,I76(E&W),I70,I79,I85,I86(W),I27,I16,I97,I96,I43,I41,

Pete from Boston


Jardine

It's a cool pic, just wish whomever took it had rolled his window down first.

:-o



Opinions expressed here on belong solely to the poster and do not represent or reflect the opinions or beliefs of AARoads, its creators and/or associates.