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Join Date: Mar 2005
Posts: 75

"American Bridges Falling Down, Falling Down..

08/01/2005 9:21 AM

A few days ago, a section of the highest ramp in a spaghetti arterial of ramps separated in Albany, NY. The downtown highway ramps and Dunn Memorial Bridge were built in 1969 and 1970 during the federal government's hand out of hundreds of millions of dollars in Urban Renewal projects.
Although originally built to handle much more traffic than it actually does and passed an inspection only 2 months ago, the bridge section still failed.
Anyone who lived in upstate New York in the late 80's remembers the Schoharie Creek Bridge collapse along Interstate 90 which claimed 8 lives. This bridge collapsed from the erosion from a pilon, but again, this was a bridge constructed in the late 60's where federal money was flowing.

My question is: Isn't it obvious that very good engineering can easily be compromised by free flowing money and haste to build? Or is this just coincidence. And shouldn't highway inspectors be focusing heavily on the construction of bridges built during the mid-60s and early 70s?
Here's a link to other bridge failures.

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The Engineer
Engineering Fields - Engineering Physics - Physics... United States - Member - NY Popular Science - Genetics - Organic Chemistry... Popular Science - Cosmology - New Member Ingeniería en Español - Nuevo Miembro - New Member

Join Date: Feb 2005
Location: Albany, New York
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#1

What disturbs me

08/01/2005 10:01 AM

is I haven't heard even an attempt of an explanation on how this could happen. It's not like we've had an earthquake recently. Why did this bridge suddenly fail? There also seems to be a considerable lack of concern in the community about this.

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The Feature Creep

Join Date: Feb 2005
Location: Boston, MA
Posts: 990
#2

Bridges

08/01/2005 10:04 AM

The scary fact is that most bridges built in the 60-70's were built on the cheap. They used as little materials as possible, usually by the lowest bidder. This means that they are barley built to spec and can not withstand any unexpected stresses.
By comparison look at the Brooklyn Bridge. It is over 100 years old (it was completed in 1883), and has no signs of structural weakness. People talk about how things were build in the "good old days". They took more care in what they build and errored on the side of caution. They were "A little more concrete and a little more steel", rather than "Can I save a buck by using 1/2 a bag less concrete in each footing?"
In case you are worried about using an older bridge the Brooklyn Bridge was built to withstand 6 times stronger than necessary (contractors used weaker wire so that it is only 4 times stronger now).

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Associate
United States - Member - NY Engineering Fields - Aerospace Engineering - RPI Class of '05 Engineering Fields - Energy Engineering - Steam Turbine Aero Design Engineer

Join Date: Apr 2005
Posts: 53
#4
In reply to #2

Next?

08/01/2005 10:22 AM

The Dunn Memorial Bridge was completed just 1 year after the Patroon Island Bridge (just to the north). Considering this bridge carries much more traffic that the Dunn, I hope DOT is taking a close look at it.

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#5
In reply to #4

Re:Next?

08/01/2005 10:28 AM

Patroon Island has had a number of extensive repairs already.

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#3

Some scary statistics

08/01/2005 10:15 AM

Some scary statistics compiled in Feb 2005 using data from the Federal Highway Administration, the Bureau of Transportation Statistics, the Bureau of Public Debt, the National Highway Traffic Safety Administration and the Texas Transportation Institute: 1) 34 percent of America's major roads are in poor or mediocre condition. 2) 27 percent of America's bridges are structurally deficient or functionally obsolete. 3) Vehicle travel on America's highways increased by 35 percent from 1990 to 2003. U.S. population grew by 17 percent between 1990 and 2003. 4) Vehicle travel on America's highways increased by 161 percent from 1970 to 2003. The nation's population grew by 43 percent during that period, while new road mileage increased by only six percent. When one in four US bridges and on-third of our roads are "dangerous", we need to rethink our priorities. Heavy investment in our infrastructure is overdue.

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#6

A few pictures of the Dunn-Memorial Bridge

08/01/2005 10:47 AM
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