WTC thin-walled exterior column box beams, stairs ,elevators, motors, high & low strength steel

the higher strength steel was used in the lower elevations of the structure

In the lower levels, the thickness was most frequently around 4 inches (10 centimeters), while at higher floors, it could be as thin as 0.25 inch (0.64 centimeter)

only 7% of the wing hits initial kinetic energy was absorbed by thin-walled high strength steel exterior column box beams through plastic deformation & fracture

ground floor Passengers took 4 local elevators that each went to 8 higher, staggered non redundant floors for accessed to 32 floors
to access the other 2/3 of the building they used 2 non-stop express elevators to the 44th & 78th floor & tose floors had 4 local elevators that each went to 8 higher, staggered non redundant floors access to 32 floors" & the only express full height elevators were to; Windows on the World restaurant in the north tower & in the south tower, the observation deck ?

http://youtu.be/-W1E0bxjcEc
https://imgur.com/a/3zXQGmr
http://i612.photobucket.com/albums/tt203/retklb2009/WTCtower_FloorElevatorArrangment1.jpg?t=1289064196
http://letsrollforums.com//outrageous-wtc-9-11-t23603.html?s=26f1ae6a821e459eb0c26af77bff23b4&
http://usatoday30.usatoday.com/news/sept11/2002-09-04-elevator-usat_x.htm
http://elevatorbobs-elevator-pics.com/wtc2.html
http://sharpprintinginc.com/911/index.php?module=pagemaster&PAGE_user_op=view_page&PAGE_id=227&MMN_position=338:338
http://911research.wtc7.net/mirrors/guardian2/wtc/eng-news-record.htm
http://sciencedirect.com/science/article/pii/S0734743X02001069
http://letsrollforums.com//outrageous-wtc-9-11-t23603p6.html
http://greatdreams.com/wtc-elevators.htm

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