The document discusses conspiracy theories around why the World Trade Center towers fell on 9/11 and examines their validity. It notes that some theories claim it was an inside job by the US government to cover up economic issues, while others point to controlled demolitions. However, the towers were designed to withstand fires for three hours, and differences in how the towers collapsed can be explained by varying structural loads between them. Sources reviewed include technical papers and references on why the towers fell.

1. MAHMUD SAIFULLAH (王方)
L163330114
Concept-Bending

2. Simple Concept
For a beam subjected to bending,
Elongation occurs on one surface and
shortening on the opposite surface of the
beam. There is a (neutral) plane through the
beam which does not change in length
during bending.

3. Why the World Trade
Center Towers Fell on 9/11

4. Conspiracy Theories….
I dunno this guy but he says, Bruh that’s an inside job…!
What shall
I do?

5. 9/11 Conspiracy Theories
Al-Qaeda
There was an advance knowledge of
the attacks
Result of controlled demolitions
To save the US from economic
meltdown

7. Really an INSIDE JOB….?
I don’t
really know.

11. Why the timing of collapse
were different?
Because of load differences

14. Why the South tower got a
tilted face?

16. WAS THE WTC DEFECTIVELY
DESIGNED?
The World Trade Center was not
defectively designed
Skyscrapers are designed to support
themselves for three hours during fire.

20. References
https://www.thoughtco.com/why-world-trade-center-towers-
fell-177706
http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.49
0.2176&rep=rep1&type=pdf
https://en.wikipedia.org/wiki/Collapse_of_the_World_Trade_C
enter
https://www.tms.org/pubs/journals/jom/0112/eagar/eagar-
0112.html
Class Notes
Smithsonian Channel