John Berry wrote:
You say they are experts of pancaking buildings and yet you don't cite a single case where they have pulled a single floor (in an otherwise unweakened building) and had it pancake at freefall speeds.
This has happened hundreds of times. NIST and others have detailed records of such events. I once saw the remains of a parking garage that collapsed straight down onto $100,000 worth of minicomputer equipment, because one floor gave way. It was MY company's computer equipment! (The insurance paid for it.)
When a single floor of a building falls down, it strikes with many times more force than any building is designed to withstand.
- Jed
