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 OOOOps! OOOOps!  Deputy Chief (retired) Vincent Dunn defines a collapsing structure "as any portion of a burning structure that collapses due to fire.

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Presentation on theme: " OOOOps! OOOOps!  Deputy Chief (retired) Vincent Dunn defines a collapsing structure "as any portion of a burning structure that collapses due to fire."— Presentation transcript:

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2  OOOOps! OOOOps!

3  Deputy Chief (retired) Vincent Dunn defines a collapsing structure "as any portion of a burning structure that collapses due to fire damage."

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5  Reviewing the 5 types  Examining inherent hazards of each.

6  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.

7  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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9  : 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)

10  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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12  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

13  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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15  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.

16  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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18  walls, floors, roofs, and other structural members are made up entirely of wood  Braced frame  Balloon frame  Platform frame

19  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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22  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

23  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

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26 the roof or floor supports fail on one side of the structure, and the opposite side of the floor is still connected

27  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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29  dropping the floors and the roof on top of each other  Voids will be created between the floors

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31  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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33  the flooring separates from the exterior bearing walls, but still is supported by one or more interior walls

34  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.

35  https://www.youtube.com/watch?v=Mntm4S dIayQBuild https://www.youtube.com/watch?v=Mntm4S dIayQBuild  (Waterloo Iowa)

36  a masonry wall falls almost straight downward  Curtains Curtains  https://video.search.yahoo.com/video/play;_ylt=AwrTHQh8UqxU mjEAVhtXNyoA;_ylu=X3oDMTB0Njd0NGhwBHNlYwNzYwRjb2xv A2dxMQR2dGlkA1NNRTgwN18x?p=fire+building+collapse+youtu be&tnr=21&vid=C67B7817CA F9CC67B7817CA F9C &l=29&turl=http%3A%2F%2Fts2.mm.bing.net%2Fth%3Fid%3DU N %26pid%3D15.1&rurl=http%3A%2F%2F J0UtY&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-t- 999%26ei%3DUTF-8&sigb=135ndp5f6

37  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.

38  Iight my fire Iight my fire  Religious reporter Religious reporter  Top IQ contestants Top IQ contestants

39  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?


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