A thrilling video footage is available at
http://peer.berkeley.edu/testing/kron_broadcast.mpg. The project primary
goal is to investigate the progressive collapse of a 6-7-story
reinforced concrete frame building columns of "new" and "old" design
during a shake table earthquake simulation. As a result of the reported
testing, the new design of reinforced concrete columns "proved" to be
much better than the old one.
Unfortunately, the "old technology" square column in the middle of
tested bent is loaded with the axial load (weight of the tributary
surcharge) twice as much in comparison with the loads supported by any
of the "new technology" circular columns on each side, which condemns
the "old technology" to a premature failure and makes the conclusion
about superiority of the "new technology" questionable.
What do you think about it?