WTC Metal Fatigue. How Did Building 7 Fall?

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SUMMARY

The discussion centers on the collapse of World Trade Center Building 7 (WTC 7) on September 11, 2001, which occurred without direct aircraft impact. Participants debate the role of fire in the building's symmetrical collapse, citing the absence of significant external damage and questioning the validity of official reports that attribute the failure primarily to fire. Key points include the presence of multiple fires on various floors, the lack of operational fire suppression systems, and the potential influence of diesel fuel stored in the building. The conversation highlights the need for further investigation into the structural integrity of steel buildings under fire conditions.

PREREQUISITES
  • Understanding of structural engineering principles related to steel buildings
  • Familiarity with fire dynamics and their effects on building materials
  • Knowledge of the official reports on WTC 7's collapse, particularly the NIST report
  • Awareness of the historical context of the 9/11 events and their impact on building safety regulations
NEXT STEPS
  • Research the NIST report on WTC 7's collapse for detailed analysis and findings
  • Study fire protection engineering principles, focusing on fire suppression systems in high-rise buildings
  • Examine case studies of other buildings that have experienced fire-induced collapses
  • Investigate the role of structural redundancy in steel construction and its implications for safety
USEFUL FOR

This discussion is beneficial for structural engineers, fire safety professionals, architects, and anyone interested in building safety and disaster response protocols.

  • #31
Noddy said:
With respect, there is a BIG difference between carefully placed and timed explosive charges which "cut" like a knife through large metal beams instantly and a "fire", weakening metal support structures at VARIOUS points in the building at VARYING rates.

The beautiful take downs of large buildings is an EXACT science reproducing those beautiful SYMMETRICAL collapse patterns.

I see what i can see. Instant, catastrophic collapse in a symmetrical pattern. Unattainable by random fires.
Since you have now confirmed our suspicions that you believe that WTC7 (and, you implied, WTC1 & 2) were felled in a controlled demolition, the term "conspiracy theory" does apply and this thread is not one about engineering. Moving to skepticism and debunking.
 
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  • #32
Ah Russ...Thankyou...

When in doubt, Da Nile becomes more than a river in Egypt.

You are obviously not "qualified" to answer my question Russ so you are free to move on to somewhere else.

Again, anyone with a background in the properties of metals under heat stress out their.

I have a very SPECIFIC question. Not %90 of a question.
 
  • #33
Noddy, your exhibiting another trademark quality of conspiracy theory nuts. "Only people who agree with me are experts"
 
  • #34
You've heard the opinion of a number of engineers here, Noddy, you've read the opinions of countless others, but you dismiss all of them in search for one who can support the conclusion you have already reached on your own - even while demonstrating a basic lack of understanding of the engineering involved. That isn't a scientific way of thinking. You'll find little sympathy for that attitude here. You'll only find real scientists and real engineers expressing real engineering opinions.
 
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  • #35
Just WHICH experts are you referring to?

It took months for the "experts" to come up with the ...quote..."truss theory".

The look on the building designers face says it all in the interview conducted after the collapse.

Answer my questions Russ...Super Mentor.

You cannot.

You and the rest of your ilk are the "specialized" idiot class who would believe Noddy and Big Ears flew into those towers because a government "expert" told you so.

I've finished playing with you.

Twas fun.
 
  • #36
Noddy said:
You and the rest of your ilk are the "specialized" idiot class who would believe Noddy and Big Ears flew into those towers because a government "expert" told you so.

I've finished playing with you.

Twas fun.
Fair 'nuff... good riddence.
 

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