+ 9/11: a terrible event on american soil (source: worldpittsburgh.wordpress.com)
TRANSCRIPT
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+ 9/11: A Terrible Event on American Soil
(Source: worldpittsburgh.wordpress.com)
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+
Nirav ShahG/T Independent ResearchHoward High SchoolDr. James A. MilkeUniversity of Maryland, College ParkStructural Fireproofing & The World Trade Center Towers: Preventing Another Collapse
(Source: 911research.wtc7.net)
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+Agenda
WTC Towers and 9/11
Spray-Applied Fire Resistant Material (SFRM)
National Institute of Standards & Technology (NIST) Investigation
Primary Analysis of NIST Report
Discussion
Conclusions
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+WTC Towers
The WTC Complex: WTC 1 (the north tower) and WTC 2 (the south tower)
Exterior columns and a rectangular service core
Floor Trusses
Lead structural engineer: Leslie Robertson
(Source: science.howstuffworks.com)
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+9/11
Two out of several terrorist attacks
Boeing 767 passenger airlines
WTC 1 – 8:46 am, Collapse: 102 minutes later
WTC 2 – 9:03 am, Collapse: 56 minutes later
(Source: www.debunking911.com)
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+National Institute of Standards & Technology (NIST) Investigation
National Construction Safety Team Act
The Investigation: October of 2002 to November of 2005
The Report: December 1st, 2005
NIST NCSTAR 1-6
(Source: www.drjudywood.com)
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+Spray-Applied Fire Resistant Material (SFRM)
Building Code Requirements
Selection of SFRM (BLAZE SHIELD Type DC/F)
Maintenance of SFRM
(Source: www.debunking911.com)
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+Spray-Applied Fire Resistant Material (SFRM)
Thickness
Thermophysical Properties
Adhesive and Cohesive Strength of SFRM
(Source: www.debunking911.com)
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+Example of Flaws in SFRM Application
(Source: www.debunking911.com)
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+Fire Resistance Testing
- Loading a floor slab with an applied load to imitate a “maximum load condition”
- The load: concrete weight and container of water
Test #1 Full Scale (35ft)
Restrained ¾ inch SFRM
Test #2 Full Scale (35ft)
Unrestrained ¾ inch SFRM
Test #3 Reduced Scale (17ft)
Restrained ¾ inch SFRM
Test #4 Reduced Scale (17ft)
Restrained ½ inch SFRM
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+Fire Resistance Testing Results
Test #1 – Full Scale - Restrained – ¾ inch SFRM: 1.5 hrs
Test #2 – Full Scale – Unrestrained – ¾ inch SFRM: 2 hrs
Test #3 – Reduced Scale – Restrained – ¾ inch SFRM: 2 hrs
Test #4 – Reduced Scale – Restrained – ½ inch SFRM: 0.75 hrs
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+Important Facts to Note
No evidence of the technical basis for the selection of the SFRM thickness and type
No evidence of fire resistance tests of the WTC floor system
An obvious correlation between the SFRM thickness and the fire endurance rating
Class 1A vs. Class 1B Fire Protection
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+Conclusions
The collapses were inevitable: time could only be saved
The SFRM was not established to prevent a collapse in this case
Established to save lives
The engineers did whatever they could accomplish as far as providing fire protection
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+Thank You! Any Questions?
(Source: www.eventresources.com)
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+Works Cited
"Asbestos Fireproofing & Fire Prevention Materials." Asbestos. The Mesothelioma Center, 2 July 2013. Web. 21 Nov. 2013. <http://www.asbestos.com/ products/general/fireproofing-fire-prevention-materials.php>. Web.
Banovic, S.W., and T.A. Siewert. "Failure of Welded Floor Truss Connections from the Exterior Wall during Collapse of the World Trade Center Towers." American Welding Society: n. pag. AWS. Web. 15 Oct. 2013.
Craven, Jackie. "Why the World Trade Center Towers Fell on September 11." About.com. N.p., n.d. Web. 27 Sept. 2013.
Eagar, Thomas W., and Musso, Christopher. "Why Did The World Trade Center Collapse? Science, Engineering, and Speculation." The Member Journal of The Minerals, Metals, & Materials Society 53.12 (2001): 8-11. TMS. Web. 15 Sept. 2013.