Widest bridge in the world - diyAudio
Go Back   Home > Forums > Member Areas > The Lounge

The Lounge A place to talk about almost anything but politics and religion.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 19th September 2012, 04:50 PM   #1
Speakerholic
diyAudio Moderator
 
Cal Weldon's Avatar
 
Join Date: Jan 2004
Location: Near Vancouver
Default Widest bridge in the world

The new Port Mann Bridge at 65m (10 lanes) surpasses the Sydney Harbour Bridge of 49m.

Set to officially open in December 2012 (8 lanes), 3 lanes for east bound traffic are already in use as of yesterday. 10 lanes will open a year after the official opening as they have to demolish the old bridge before the last 2 lanes can be built.

Port Mann Bridge
__________________
Next stop: Margaritaville
Some of Cal's stuff | Cal Weldon Consulting
  Reply With Quote
Old 20th September 2012, 04:23 AM   #2
diyAudio Member
 
dchisholm's Avatar
 
Join Date: Mar 2011
Location: St Louis, Mo
Those cable-stay bridges seem to be quite popular right now - we have some here in the St Louis (Missouri, USA) region and one under construction over the Mississippi River. They certainly have a striking visual appearance. As Dr Henry Petroski said in his recent column "Everyone Loves Good Design", in DesignNews at < http://www.designnews.com/author.asp...dfpLayout=blog >:
Quote:
Unlike buildings, which hide their engineering behind architectural facades, bridges tend to lay bare their structural design features. The lines by which forces are directed and transferred are exposed and open to admiration, exploration, and fascination.
I'm surprised he didn't mention this Port Mann span.

Even so, when I see cable-stayed bridges, the multiple cables give me a nagging thought that it's an overly complex design. As with any design innovation there will probably be a failure at some point. This, in turn, will lead to better understanding of the design and even more capable implementations - as the 1940 failure of the Tacoma Narrows suspension bridge eventually resulted in the successful but much more challenging spans at Mackinac, Akashi-Kaiko, et al. We need to have faith that some alert engineers will identify potential failures and avert catastrophes.

Dale

p.s. - In case you haven't discovered him, Petroski is definitely worth reading for his perspectives on engineering philosophy and the design process.

Last edited by dchisholm; 20th September 2012 at 04:26 AM.
  Reply With Quote
Old 20th September 2012, 04:33 AM   #3
nezbleu is offline nezbleu  Canada
diyAudio Member
 
nezbleu's Avatar
 
Join Date: Dec 2009
Location: Halifax, Nova Scotia, Canada
I understand that when the fixed link to PEI was planned, there was a suggestion for a similar (although narrower) cable-stay bridge in the center section. The cables were to be painted a bright green, producing a "Span of Green Cables".

(Canadian joke, see Lucy Maud Montgomery)
  Reply With Quote
Old 20th September 2012, 04:38 AM   #4
Pano is online now Pano  United States
diyAudio Moderator
 
Pano's Avatar
 
Join Date: Oct 2004
Location: Kona, Hawaii
Blog Entries: 4
All those people going somewhere. That's a lot of bridge!
  Reply With Quote
Old 20th September 2012, 05:13 AM   #5
chrisb is offline chrisb  Canada
diyAudio Member
 
Join Date: Aug 2002
Location: victoria BC
Quote:
Originally Posted by Pano View Post
All those people going somewhere. That's a lot of bridge!


to Timmies for double-doubles and honey glazed crullers of course

as Cal or nezbleu would say, it's a canuck thing

all kidding aside, the egg white breakfast sandwich on English biscuit is not the worst way to start your day
__________________
now on sabbatical
  Reply With Quote
Old 20th September 2012, 06:54 AM   #6
diyAudio Member
 
PlasticIsGood's Avatar
 
Join Date: Mar 2012
Location: Bradford
If the towers were thicker, they wouldn't need so many cables to hold them up.

It doesn't look very musical. If all cables contribute the same upward force, how are their frequencies related?
  Reply With Quote
Old 20th September 2012, 07:03 AM   #7
diyAudio Member
 
jan.didden's Avatar
 
Join Date: May 2002
Location: Great City of Turnhout, Belgium
Blog Entries: 7
Quote:
Originally Posted by dchisholm View Post
Dale

p.s. - In case you haven't discovered him, Petroski is definitely worth reading for his perspectives on engineering philosophy and the design process.
Just am reading Petroski's "To Engineer is Human - the role of failure in successful design". The cover has a great picture of that historical bridge failure. Great read, BTW.

jan didden
__________________
If you don't change your beliefs, your life will be like this forever. Is that good news? - W. S. Maugham
Check out Linear Audio!
  Reply With Quote
Old 21st September 2012, 09:43 PM   #8
Speakerholic
diyAudio Moderator
 
Cal Weldon's Avatar
 
Join Date: Jan 2004
Location: Near Vancouver
Quote:
Originally Posted by PlasticIsGood View Post
If the towers were thicker, they wouldn't need so many cables to hold them up.
__________________
Next stop: Margaritaville
Some of Cal's stuff | Cal Weldon Consulting
  Reply With Quote
Old 22nd September 2012, 01:03 AM   #9
Ron E is offline Ron E  United States
diyAudio Member
 
Ron E's Avatar
 
Join Date: Jun 2002
Location: USA, MN
Quote:
Originally Posted by Cal Weldon View Post
Minneapolis has a new 10 lane bridge, although for the purposes of your metric, it is probably 2x 30 meter bridges
__________________
Our species needs, and deserves, a citizenry with minds wide awake and a basic understanding of how the world works. --Carl Sagan
Armaments, universal debt, and planned obsolescence--those are the three pillars of Western prosperity. —Aldous Huxley
  Reply With Quote
Old 22nd September 2012, 01:48 AM   #10
Speakerholic
diyAudio Moderator
 
Cal Weldon's Avatar
 
Join Date: Jan 2004
Location: Near Vancouver
If you look at it, I am guessing the 65m part is where it goes around the two towers.
It's the only cable suspension bridge that I've seen that uses 4 cables at each stage. We have others in the area with the more traditional 2 as much of the world does. As far as the widest bridge in the world part goes, we didn't heard that until recently, or maybe I hadn't paid attention. I have watched the bridge go up from my office window since day 1. Well actually for the first year all I heard was the pile driving which, in it's own right, was kinda cool. They used the, what I'm gonna call, the diesel type. Maybe someone can tell me what it's really called but it's the one that uses a fuel rather than a crane. The rhythm is faster so while I am doing my typing, it keeps me in synch.

It's been a great thing for those of us who watch those Discovery channel or Nat Geo shows on this sort of thing. I am guessing it will be there one day.

Oh, and uh Ron...I am of the ilk that uses standard measures still, along with the metric, even though Canada went to metric uh, I don't know, 30+ years ago. I understand both but the tape I use when building things is still standard measure. Old habits die hard.

Cheers.
__________________
Next stop: Margaritaville
Some of Cal's stuff | Cal Weldon Consulting
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Justone - Germans supplier of Laser Heads with widest range-no success by contact try tiefbassuebertr Digital Source 0 24th February 2011 08:26 PM
Reopening an unfinished debate: Dual bridge vs. Single Bridge xiphmont Chip Amps 15 26th February 2008 08:22 PM
The difference of Push-pull,Half-bridge,Full-bridge digi01 Chip Amps 0 8th September 2006 03:10 AM
Whats the difference between full bridge and half-bridge SMPS ? skaara Class D 6 3rd February 2005 08:23 PM


New To Site? Need Help?

All times are GMT. The time now is 07:16 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ©1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2