Steel frame before loading. This has three outer walls intact revealing the inner core and a few floors. The fourth wall has not been attached yet:
Complete loaded tower. This is a 1:200 scale model-- 1 foot wide by 6.5 feet tall. It only has 22 floors though:
The frame is about 30 pounds of steel wire, it was loaded with 50 pounds of sand in bags and 35 pounds of ceramic tile-- the weight was fairly evenly distributed.
"Plane" damage-- severe case-- about 1/3 of the core is severed:
To mimic fire damage, all the columns on one side were cut along with all the columns of half of the core. The tower was quite stable with this damage:
I could get the tower top to lean over if I pulled on it VERY HARD:
The tower was NOT going to fall down on the "impact side"-- but I could tilt the tower on the other side of the "plane damage" more easily. The tower here was stable-- in no danger of collapsing:
I cut some more of the core columns, and the top leaned at a 90 degree angle:
I cut all of the core columns and the top fell some more:
A very unexpected result!!!!! This thing was stable as could be!
Finally I cut all the columns on one floor and the top fell to the ground. Surprisingly (joke), the top stayed intact after falling!