collapse of wtc 7
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Collapse ofWorld Trade Center
- The truth behind itBY
CHIN KIM MING KEB110007
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IntroductionCollapse of the World Trade Cente
WTC 2
(South Tower)At 9.59am
WTC 1
(North Tower)At 10.28am
WTC 7
At 5.21pm
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WTC 7 was not hit by plane like the twin towers ( WTC 1 & WTC 2)
WTC falls in almost free fall manner
No known casualties due to this collapse
According to official report, its primarily due to FIRES,which iscaused by debris from North Tower.
However, some experts said its primarily due to CONTROLLEDDEMOLITION.
Before 911, theres no steel framed skyscraper had ever collapseddue to fire.
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Report by Federal EmergencyManagement Agency (FEMA)
After South Tower collapsed, electricity in WTC 7 is shut down but generstarted up by itself.
Debris from North Tower breached a fuel oil pipe in north side of WTC 7.Numerous fires also started by other debris but generators arent shut do
Back up mechanism (shut down generators when are breached) failedwork.
Fuel oil (diesel) was pumped from ground floor to 5 thfloor at where it ignwith 140 F from the fire.
The sprinkled system failed to extinguish the fire.
The burning fuel oil heated the trusses to the point where they lost most their strength.
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Conclusion by FEMA report authors:
The specifics of the fires in WTC 7 and how they caused thebuilding to collapse remain unknown at this time. Although thtotal diesel fuel on the premises contained massive potentialenergy, the best hypothesis has only a low probability ofoccurrence. Further research, investigation, and analyses are
needed to resolve this issue.
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Report by National Institute ofScience and Technology (NIST)
It is determined that diesel fuel, transfer element (trusses,grinders, and cantilever overhangs) and structural damagefrom the collapse of the Twin Tower did not play an importantrole in the collapse of WTC 7.
Important factor = LACK OF WATER to fight fire
The uncontrolled fire caused floor beam near column 79 to
expand, triggering the failure of floors around column 79 onfloors 8 to 14. Losing lateral support, column 79 buckled pullingthe east penthouse down with it.
The buckling overload the perimeter support, which buckledbetween floors 7 to 17, causing the remaining portion of thebuilding to fall as a single unit.
The fire, fueled by office content and lack of water = key factor
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Conspiracy Theories by somePofessionals
Two professors of structural engineering at a prestigious Swiss university(Dr. Joerg Schneider and Dr. Hugo Bachmann) said that,on 9/11, WorldTrade Center 7 was brought down by controlled demolition
Alfred Lee Lopez, with 48 years of experience in all types of buildings:I agree the fire did not cause the collapse of the three buildings. Themost realistic cause of the collapse is that the buildings were imploded
Steven L. Faseler, structural engineer with over 20 years of experience inthe design and construction industry: World Trade Center 7 appears tobe a controlled demolition. Buildings do not suddenly fall straight downby accident.
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Public Eye- Witness
118 documented eye-witness accounts from first responder fire fightersand police officers stating that they either saw or heard explosionsgoing off in all three towers. Some of these eye-witness accounts statethat the explosions were occurring deep in the basement levels andground floor levels, not just high up near where the fires wereburning. Some of these eye-witness accounts even had explosionsoccurring in the basement levels before the first plane struck the tower
Explosion?
Controlled Demolition
Free fall?
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Government agencies and financial institutionssuch as IRS, US Secret Service, CIA, Securities &Exchange Commission and Mayors Office ofEmergency Management.
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Numerous eye-witness accounts and video footage showing thatthere was liquid molten steel all through the towers, including deepin the basements. The temperatures required to turn steel beamsinto molten liquid are approximately 2500 degrees centigrade. Themaximum temperature that jet fuel fires can reach is only around350 degrees centigrade, and in normal office fires the atmospherictemperature will reach around 1000 degrees centigrade and the
actual steel beams will only reach around 650 degrees centigrade
This is why no high rise tower has collapsed due to fire in history,other than the 3 towers happened on 911.
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Inconsistencies of NIST report
Reluctance of further investigating the steel from the building
The steel is cleared and reused/recycled for other purpose
FEMA investigated a piece of steel which shows Tm is around 1482degree Celcius which couldnt be melted by the fire in WTC
Ignorance of the eye-witnesses on the molten steel and explosion
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Conclusion
Until today, the exact reason is still unknown.
No conclusion
It leaves something for us to think critically about it.
We shouldnt make a conclusion without reliable andcredible evidence.
The truth may not be sighted.
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Q & A Session
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Thank you!