Fire in Atlanta
Fire in Atlanta
(OP)
From the AP, " A large fire has caused an overpass on Interstate 85 to collapse in Atlanta.
WSB-TV reports the massive blaze is burning underneath I-85 northbound near Piedmont Road. It has shut down several roads in northeast Atlanta.
Witnesses say troopers were telling cars to turn around on the bridge because they were concerned about its integrity. Minutes later, the bridge collapsed."
Dik
WSB-TV reports the massive blaze is burning underneath I-85 northbound near Piedmont Road. It has shut down several roads in northeast Atlanta.
Witnesses say troopers were telling cars to turn around on the bridge because they were concerned about its integrity. Minutes later, the bridge collapsed."
Dik





RE: Fire in Atlanta
RE: Fire in Atlanta
RE: Fire in Atlanta
B.E.
You are judged not by what you know, but by what you can do.
RE: Fire in Atlanta
http://www.philly.com/philly/blogs/real-time/Atlan...
RE: Fire in Atlanta
Robert Hale, PE
RE: Fire in Atlanta
You can have a look on Google Street View yourself here: https://www.google.com/maps/@33.8135991,-84.366601...
RE: Fire in Atlanta
Keith Cress
kcress - http://www.flaminsystems.com
RE: Fire in Atlanta
RE: Fire in Atlanta
RE: Fire in Atlanta
http://www.cbsnews.com/news/tanker-fire-causes-ca-highway-collapse/
Keith Cress
kcress - http://www.flaminsystems.com
RE: Fire in Atlanta
Experts in structural engineering said fires on highways and bridges rarely burn long enough or hot enough to cause a complete collapse — but it has happened. Intense heat can compromise even steel-reinforced concrete, said Lauren Stewart, director of the Structural Engineering and Materials Laboratory at Georgia Tech in Atlanta.
It is SO nice to have a reference to "structural engineering" instead of "An Architect stated...."
McMurry said his department stored coils of plastic conduit, used in fiber optic networks, beneath the span but insisted they were noncombustible.
So if these coils were non-combustible, what the heck fueled such a hot fire?
Check out Eng-Tips Forum's Policies here:
FAQ731-376: Eng-Tips.com Forum Policies
RE: Fire in Atlanta
RE: Fire in Atlanta
Check out Eng-Tips Forum's Policies here:
FAQ731-376: Eng-Tips.com Forum Policies
RE: Fire in Atlanta
RE: Fire in Atlanta
So the next fire will be of something slightly different. Like PE
RE: Fire in Atlanta
Professional Engineer (ME, NH, MA) Structural Engineer (IL)
American Concrete Industries
https://www.facebook.com/AmericanConcrete/
RE: Fire in Atlanta
RE: Fire in Atlanta
"Where the spirit does not work with the hand, there is no art." - Leonardo da Vinci
RE: Fire in Atlanta
RE: Fire in Atlanta
RE: Fire in Atlanta
Keith Cress
kcress - http://www.flaminsystems.com
RE: Fire in Atlanta
Agree. The "self-extinguishing" material rating is misunderstood by many and would appear so in this case in the decision to store probably what was UL-94 rated plastic material under the bridge.
The problematic part of that rating is that the self extinguishing test is in part a heat transfer issue.. A single specified piece of material suspended per the test may well receive the rating, but that same material in a confined area, with reflected heat, other ongoing ignition source, or otherwise different heat transfer/escape characteristics means it may burn rather violently.
Learned this in an evaluation of an issue in a fairly large digital system using an extensive amount of ABS UL94 rated plastics. The plastics first melt into a black tar like residue (plastics being a petroleum derivative) and then ignites and burns with the ferocity of a petroleum fire. The materials engineer in this investigation mentioned that the bromine and other compounds added to plastics for the flame retardant rating yields considerable chlorine gas when burned.
RE: Fire in Atlanta
RE: Fire in Atlanta
Dik
RE: Fire in Atlanta
RE: Fire in Atlanta
Dik