Butch Lambert
Active member
Well designed grade beams are a serious PITA to remove.
The rebar gives the composite beam the same strength in tension
as the concrete has in compression.
We had a very large vibration table.
About 10 feet by ten feet.
We used it for testing entire racks of U-2 equipment.
The concrete base under it wend down to bedrock.
When it was running the whole building vibrated.
Most larger test had to be run at night when
the place was pretty empty of employees.
So you worked with the Lockheed folks at Plant 42 out of Palmdale.