AARoads Forum

Please login or register.

Login with username, password and session length
Advanced search  

Author Topic: Bridges with cables that drop below road deck  (Read 4034 times)

roadman65

  • *
  • Offline Offline

  • Posts: 8646
  • Location: Orlando, fl
  • Last Login: October 18, 2018, 11:27:18 PM
Bridges with cables that drop below road deck
« on: December 04, 2015, 12:55:52 PM »

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.
Logged
Every day is a winding road, you just got to get used to it.

Sheryl Crowe

Jardine

  • *
  • Offline Offline

  • Posts: 716
  • Location: Midwest
  • Last Login: September 06, 2018, 02:05:15 PM
Re: Bridges with cables that drop below road deck
« Reply #1 on: December 04, 2015, 01:57:20 PM »

Brooklyn Bridge would be the 'classic' example.
Logged

SteveG1988

  • *
  • Offline Offline

  • Posts: 2405
  • Age: 30
  • Location: New Jersey
  • Last Login: October 17, 2018, 02:33:08 AM
Re: Bridges with cables that drop below road deck
« Reply #2 on: December 05, 2015, 10:41:34 PM »

Riegelsville Bridge in NJ/PA.
Logged

Jardine

  • *
  • Offline Offline

  • Posts: 716
  • Location: Midwest
  • Last Login: September 06, 2018, 02:05:15 PM
Re: Bridges with cables that drop below road deck
« Reply #3 on: December 05, 2015, 10:50:04 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 ??
Logged

SteveG1988

  • *
  • Offline Offline

  • Posts: 2405
  • Age: 30
  • Location: New Jersey
  • Last Login: October 17, 2018, 02:33:08 AM
Re: Bridges with cables that drop below road deck
« Reply #4 on: December 07, 2015, 09:15:09 AM »

Robeling Aqueduct over the delaware river.
Logged

BrianP

  • *
  • Offline Offline

  • Posts: 360
  • Location: Maryland
  • Last Login: Today at 10:48:27 AM
Logged

Jardine

  • *
  • Offline Offline

  • Posts: 716
  • Location: Midwest
  • Last Login: September 06, 2018, 02:05:15 PM
Re: Bridges with cables that drop below road deck
« Reply #6 on: December 07, 2015, 05:22:03 PM »

« Last Edit: December 07, 2015, 05:25:36 PM by Jardine »
Logged

Jardine

  • *
  • Offline Offline

  • Posts: 716
  • Location: Midwest
  • Last Login: September 06, 2018, 02:05:15 PM
Re: Bridges with cables that drop below road deck
« Reply #7 on: December 07, 2015, 05:22:40 PM »

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

{nevermind, figured it out}
« Last Edit: December 07, 2015, 05:26:10 PM by Jardine »
Logged

BrianP

  • *
  • Offline Offline

  • Posts: 360
  • Location: Maryland
  • Last Login: Today at 10:48:27 AM
Re: Bridges with cables that drop below road deck
« Reply #8 on: December 07, 2015, 05:33:43 PM »

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.
Logged

Jardine

  • *
  • Offline Offline

  • Posts: 716
  • Location: Midwest
  • Last Login: September 06, 2018, 02:05:15 PM
Re: Bridges with cables that drop below road deck
« Reply #9 on: December 07, 2015, 07:14:08 PM »

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

Totally unlike, for example, the Golden Gate.

« Last Edit: December 07, 2015, 07:16:40 PM by Jardine »
Logged

Rothman

  • *
  • *
  • Online Online

  • Posts: 4043
  • Last Login: Today at 11:00:30 AM
Re: Bridges with cables that drop below road deck
« Reply #10 on: December 09, 2015, 02:30:26 PM »

Robeling Aqueduct over the delaware river.

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

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

Jardine

  • *
  • Offline Offline

  • Posts: 716
  • Location: Midwest
  • Last Login: September 06, 2018, 02:05:15 PM
Re: Bridges with cables that drop below road deck
« Reply #11 on: December 09, 2015, 11:03:02 PM »

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

  :biggrin:
Logged

SteveG1988

  • *
  • Offline Offline

  • Posts: 2405
  • Age: 30
  • Location: New Jersey
  • Last Login: October 17, 2018, 02:33:08 AM
Re: Bridges with cables that drop below road deck
« Reply #12 on: December 17, 2015, 02:03:25 PM »

Robeling Aqueduct over the delaware river.

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

Drove across it myself. :D
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.
Logged

Pete from Boston

  • *
  • Offline Offline

  • Posts: 5245
  • Location: Massachusetts, and all the roads radiating out of it
  • Last Login: September 10, 2018, 07:34:46 PM
Re: Bridges with cables that drop below road deck
« Reply #13 on: December 17, 2015, 02:09:34 PM »




Brings a whole new meaning to the term "ghost ramps."
Logged

Jardine

  • *
  • Offline Offline

  • Posts: 716
  • Location: Midwest
  • Last Login: September 06, 2018, 02:05:15 PM
Re: Bridges with cables that drop below road deck
« Reply #14 on: December 17, 2015, 05:20:22 PM »

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

 :-o
Logged

 


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.