Structuralal Mechanics

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