I've scrolled through most of the thread...lot's of stuff about why it happened, physics, chocks, etc etc.
But I didn't see any comment about why the fuselage seemed to more or less snap like a broken twig, slightly aft of the flight deck.
Can anyone enlighten a non-structural engineer, non-physicist, non-most things person?
I always thought that the fuselage structure is supposed to withstand quite severe unexpected and unusual forces. And this one didn't.
The initial aircraft motion was parallel to the ground. Eventually it contacted a hard immovable object which now changed the motion to about 45 degrees to the ground. This force appears to have been applied directly to the underside of the fuselage located forward of the wing and main gear.
Thus a significant bending moment coupled with significant impact forces resolved through the 45 degree change in direction.
Not exactly considered in the normal operational design of an aircraft