Join Early Retirement Today
Reply
 
Thread Tools Search this Thread Display Modes
I-5 Skagit River Bridge Collapses
Old 05-23-2013, 10:25 PM   #1
Give me a museum and I'll fill it. (Picasso)
Give me a forum ...
haha's Avatar
 
Join Date: Apr 2003
Location: Hooverville
Posts: 22,380
I-5 Skagit River Bridge Collapses

This bridge is just north of Mount Vernon, about 65 miles north of Seattle, and 45 miles S of the border at Blaine, WA/White Rock, BC. No word on any deaths or injuries. This water is very cold, and often pretty swift. The Skagit River originates from glacial feed in the North Cascades. Collapse happened at 7:00 pt.
-One clever guy sitting atop his car.

Ha
__________________

__________________
"As a general rule, the more dangerous or inappropriate a conversation, the more interesting it is."-Scott Adams
haha is offline   Reply With Quote
Join the #1 Early Retirement and Financial Independence Forum Today - It's Totally Free!

Are you planning to be financially independent as early as possible so you can live life on your own terms? Discuss successful investing strategies, asset allocation models, tax strategies and other related topics in our online forum community. Our members range from young folks just starting their journey to financial independence, military retirees and even multimillionaires. No matter where you fit in you'll find that Early-Retirement.org is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with our members, see fewer ads, upload photographs, create a retirement blog, send private messages and so much, much more!

Old 05-23-2013, 11:12 PM   #2
Thinks s/he gets paid by the post
Helen's Avatar
 
Join Date: Oct 2004
Location: Portland
Posts: 1,339
Look at that guy sitting on the top of his car. I really hope there were no injuries or deaths.
__________________

__________________
Helen is offline   Reply With Quote
Old 05-23-2013, 11:43 PM   #3
Recycles dryer sheets
 
Join Date: Mar 2008
Posts: 223
possible oversize load semi hit the bridge girders
__________________
DAYDREAMER is offline   Reply With Quote
Old 05-24-2013, 10:38 AM   #4
Give me a museum and I'll fill it. (Picasso)
Give me a forum ...
Chuckanut's Avatar
 
Join Date: Aug 2011
Location: West of the Mississippi
Posts: 6,321
When I first heard this news, they said "THE I-5 bridge collapsed!"

'THE I-5 bridge' - like there is only one. I thought it must be the big one that spans the Columbia river going into Oregon. What a mess that would have been. Fortunately, it was a minor bridge over a smaller river. It will still be a mess for quite some time. I-5 is the main highway going from Mexico to Canada. Truckers can't be happy with this problem.
__________________
The worst decisions are usually made in times of anger and impatience.
Chuckanut is online now   Reply With Quote
Old 05-24-2013, 11:34 AM   #5
Give me a museum and I'll fill it. (Picasso)
Give me a forum ...
 
Join Date: Jul 2006
Posts: 11,017
Apparently the precipitating event was an oversize load of drilling equipment that hit a support girder. The driver was Canadian. We apologize!

I-5 bridge collapse caused by Edmonton trucker | World | News | National Post
__________________
Meadbh is offline   Reply With Quote
Old 05-24-2013, 12:12 PM   #6
Recycles dryer sheets
mn54's Avatar
 
Join Date: Sep 2007
Location: mpls, mn
Posts: 440
Living in mpls. it immediately brought back terrible memories of the bridge collapse here. My thoughts and prayers for all those affected by this tragedy.
__________________
mn54 is offline   Reply With Quote
Old 05-24-2013, 12:15 PM   #7
Give me a museum and I'll fill it. (Picasso)
Give me a forum ...
 
Join Date: Jul 2006
Posts: 11,017
Was the bridge stable to begin with?

http://www.thecanadianpress.com/engl...4&languageid=1

Sounds like a single point failure with no redundancy:

http://www.usatoday.com/story/news/n...truck/2357389/

Hopefully some engineering lessons will come out of this.
__________________
Meadbh is offline   Reply With Quote
Old 05-24-2013, 02:01 PM   #8
Give me a museum and I'll fill it. (Picasso)
Give me a forum ...
haha's Avatar
 
Join Date: Apr 2003
Location: Hooverville
Posts: 22,380
The economic losses will be huge. Cross border retail will suffer little, Whatcom County will gain at the expense of Skagit County (pronounced skajit).

But truck transport between the US and Canada will really be hurt. I-5 is the only interstate served border crossing for many miles to the east. I am not even sure what the next Interstate served crossing might be. Proably somewhere in Montana.

Going east from I-5, there is a mostly 2 lane SR9, and farther east a us highway, also 2 lane.

Vancouver is an even bigger port than Seattle/Tacoma, and very much cross border traffic. And, IRRC, roads trying to go east out of the Vancouver Basin are pretty low capacity.

Ha
__________________
"As a general rule, the more dangerous or inappropriate a conversation, the more interesting it is."-Scott Adams
haha is offline   Reply With Quote
Old 05-24-2013, 02:40 PM   #9
Give me a museum and I'll fill it. (Picasso)
Give me a forum ...
braumeister's Avatar
 
Join Date: Feb 2010
Location: Northern Kentucky
Posts: 8,588
Quote:
Originally Posted by Meadbh View Post
The driver was Canadian.
I've heard about those Canadian drivers.
Attached Images
File Type: jpg dudley.jpg (8.7 KB, 70 views)
__________________
braumeister is online now   Reply With Quote
Old 05-24-2013, 03:30 PM   #10
Give me a museum and I'll fill it. (Picasso)
Give me a forum ...
HFWR's Avatar
 
Join Date: May 2005
Location: Lawn chair in Texas
Posts: 12,964
Quote:
Originally Posted by braumeister View Post
I've heard about those Canadian drivers.
Or perhaps it was "weather related"...

__________________
Have Funds, Will Retire

...not doing anything of true substance...
HFWR is offline   Reply With Quote
Old 05-24-2013, 07:21 PM   #11
Moderator
Ronstar's Avatar
 
Join Date: Aug 2007
Location: A little ways southwest of Chicago
Posts: 9,341
Quote:
Originally Posted by Meadbh View Post
Was the bridge stable to begin with?

http://www.thecanadianpress.com/engl...4&languageid=1

Sounds like a single point failure with no redundancy:

State of emergency declared around collapsed bridge

Hopefully some engineering lessons will come out of this.
Huh? The problem is lack of funding to replace a 58 year old bridge, not the bridge design. Here's a quote from your second link: "The Skagit River bridge, built in 1955, is classified as a "fracture critical" bridge by the Federal Highway Administration. That means it lacks redundant supports elements, not that the design is faulty."
__________________
Ronstar is offline   Reply With Quote
Old 05-24-2013, 08:07 PM   #12
Thinks s/he gets paid by the post
Htown Harry's Avatar
 
Join Date: May 2007
Posts: 1,516
Quote:
Originally Posted by Meadbh View Post
Was the bridge stable to begin with?

http://www.thecanadianpress.com/engl...4&languageid=1

Sounds like a single point failure with no redundancy:

State of emergency declared around collapsed bridge

Hopefully some engineering lessons will come out of this.
The strength of the bridge to handle vertical loads from vehicles and the structure's weight is primarily in those horizontal, vertical and diagonal members in the vertical plane along the outside of the bridge (forming a truss). The members in the horizontal plane forming a "roof" provide stability to keep the trusses in place and to provide resistance to horizontal wind loads.

This picture is may be telling. Areas with red primer showing are points where the steel twisted or bent, causing the outer paint coat to flake off. Note the damage to the arched steel member above the man shielding his eyes. It looks like the too-tall load may have taken a chunk out of it. Follow that member to the right, where the vertical piece above the car is kinked toward the inside of the bridge.



One theory that the investigators will explore: the impact to the arching member(s) was so severe that it damaged the vertical members they are attached to. The displacement of those vertical members redistributed the vertical loads carried by the various members forming the truss. One or more of the truss members then became overloaded or unstable as a result, initiating a critical failure in a load-bearing member and starting the collapse sequence.

Quote:
Originally Posted by Ronstar View Post
Huh? The problem is lack of funding to replace a 58 year old bridge, not the bridge design. Here's a quote from your second link: "The Skagit River bridge, built in 1955, is classified as a "fracture critical" bridge by the Federal Highway Administration. That means it lacks redundant supports elements, not that the design is faulty."
Bridge design criteria has changed in the 58 years since the bridge with constructed. My interpretation:

A faulty design is one which cannot handle the expected service loads, defined for a bridge superstructure primarily by vehicle weights, the structure weight and wind / ice loads. "Fracture critical" design is related to the redundancy and factor of safety in sizing members and connections for handling overloads and member damage outside normal service conditions.

Today's bridge designs are more forgiving of things like crappy paint jobs, bad welds and dumb truck drivers.
__________________
No doubt a continuous prosperity, though spendthrift, is preferable to an economy thriftily moral, though lean. Nevertheless, that prosperity would seem more soundly shored if, by a saving grace, more of us had the grace to save.

Life Magazine editorial, 1956
Htown Harry is offline   Reply With Quote
Old 05-25-2013, 10:23 AM   #13
Thinks s/he gets paid by the post
 
Join Date: Nov 2009
Posts: 3,857
These bridge collapses always give me a chill because they bring back memories of two big bridge collapses in the 1980s in the northeast. One was the Mianus River bridge collapse on I-95 near Greenwich, CT, in June of 1983 and the other was the Schoharie Creek bridge collapse on the New York State Thruway in April of 1987. In the latter, I was driving on the Thruway in the area that weekend in heavy rains (which contributed to the collapse) but did not actually cross that particular bridge. Still gave me the chills seeing pictures of the washed out bridge in the newspaper.

The Mianus collapse caused huge traffic headaches along that heavily traveled highway especially through the upper-class Greenwich community that summer.
__________________
Retired in late 2008 at age 45. Cashed in company stock, bought a lot of shares in a big bond fund and am living nicely off its dividends. IRA, SS, and a pension await me at age 60 and later. No kids, no debts.

"I want my money working for me instead of me working for my money!"
scrabbler1 is offline   Reply With Quote
Old 05-25-2013, 10:38 AM   #14
Give me a museum and I'll fill it. (Picasso)
Give me a forum ...
Chuckanut's Avatar
 
Join Date: Aug 2011
Location: West of the Mississippi
Posts: 6,321
Washington state has a history of interesting bridge collapses:

__________________

__________________
The worst decisions are usually made in times of anger and impatience.
Chuckanut is online now   Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

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


 

 
All times are GMT -6. The time now is 12:20 PM.
 
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.