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OOOOps!
 Deputy Chief (retired) Vincent
Dunn defines a collapsing
structure "as any portion of a
burning structure that
collapses due to fire damage."
 Reviewing the 5 types
 Examining inherent hazards of each.
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made from non-combustible materials that
do not add to the fire load
usually massive steel components that are
encased in concrete
cast-in-place concrete, or the slabs may be
poured off-site
most resistant to collapse.
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28 days to fully cure to a point that collapse is
no longer a threat.
connection points have been the result of a
catastrophic failure
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: The structural steel is encased with a light
fire-resistive coating
sheetrock or a sprayed-on coating
. These structures employ a lightweight
parallel steel bar joist system that holds up a
corrugated steel roof deck ( Timberlake HS
Gym)
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the materials that make up the roof covering
a large amount of windows in the front wall
opening is spanned with a steel lintel that will
support a free-standing parapet wall. If this
lintel is compromised in any fashion, it can
result in a complete failure of the parapet wall
employs a pre-cast wall slab that is tilted into
place Each slab is braced with steel rods or
rebar and insulated at the sides with each
other
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use load bearing walls of masonry
construction,
the roof and the floor can be made of wood.
can be either balloon frame or braced frame
construction
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older buildings may also have a parapet wall
at the roof line, but with a twist: there may
also be a cornice
25 feet will have an additional steel I-beam
support called a channel rail
Spreader plates, in the shape of stars, plates,
or channel sections
but beware the spreader plates that are
irregular in placement
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Exterior walls are brick or other type of
masonry,
the columns being a minimum of eight inches
by eight inches
used to house commercial occupancies
originally
the second-most resistant to collapse.
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buildings more resistant to collapse
neglect, shoddy renovations, and weak
connection points can cause complete failure
These trusses can be parallel chord or
bowstring
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walls, floors, roofs, and other structural
members are made up entirely of wood
Braced frame
Balloon frame
Platform frame
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Braced frames resist gravity load in bending
and axial compression, and lateral load in
axial compression and tension by
triangulation, much like trusses
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are all wood
. Two-by-four studs may in fact be holding up
an entire upper floor, with no built-in
compensation supports
many of these structures have a veneer wall,
made of decorative masonry materials
are attached to the wood wall, placing an
eccentric load on the wall
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Lightweight construction components, such
as trusses, truss joist I-beams (TJIs) and
Oriented Strand Board (OSB)
larger square footage, but are being
constructed with half of the materials that
were used in the past
the roof or floor supports fail on one side of
the structure, and the opposite side of the
floor is still connected
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lower walls or floor joists fail, due to heavy
loads located in the center of the floor.
two voids, one near each exterior wall.
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dropping the floors and the roof on top of
each other
Voids will be created between the floors
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collapse occurs when one or more walls have
failed
other end of the floor is still attached to the
other bearing wall.
the most dangerous type of collapse to
operate in
adequate shoring must be in place before
operations can commence.
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the flooring separates from the exterior
bearing walls, but still is supported by one or
more interior walls
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entire wall falls out as one unit, falling
outward
Masonry walls collapse more commonly in
this fashion
V structures with veneer walls can fall victim
to this collapse as well.
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https://www.youtube.com/watch?v=Mntm4S
dIayQBuild
(Waterloo Iowa)
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a masonry wall falls almost straight downward
Curtains
https://video.search.yahoo.com/video/play;_ylt=AwrTHQh8UqxU
mjEAVhtXNyoA;_ylu=X3oDMTB0Njd0NGhwBHNlYwNzYwRjb2xv
A2dxMQR2dGlkA1NNRTgwN18x?p=fire+building+collapse+youtu
be&tnr=21&vid=C67B7817CA1695027F9CC67B7817CA1695027F9C
&l=29&turl=http%3A%2F%2Fts2.mm.bing.net%2Fth%3Fid%3DU
N.608005844396607849%26pid%3D15.1&rurl=http%3A%2F%2F
www.youtube.com%2Fwatch%3Fv%3DjNtnjJ0UtY&sigr=11ahobk0t&tt=b&tit=NEW+YORK+BUILDING+COLL
APSES+AFTER+FIRE!&sigt=117s9r4i9&back=https%3A%2F%2Fse
arch.yahoo.com%2Fsearch%3Fp%3Dfire%2Bbuilding%2Bcollapse
%2Byou%2Btube%26type%3D2button%26fr%3Dymyy-t999%26ei%3DUTF-8&sigb=135ndp5f6
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the wall literally breaks in two, with the
bottom section of the wall falling outward,
and the top floors falling inward
Braced frame buildings are known to fail in
this fashion. This type of collapse occurs more
commonly in wood frame buildings, many
times without warning.
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Iight my fire
Religious reporter
Top IQ contestants
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What are the 5 types of construction?
What type possess the least collapse risk?
What is critical about a cantilever collapse?
If we have a fire on main street how much
protection are do we need if we have a 90
degree full wall collapse?