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RE: storage racks with partially restrained moment connections - wind frame analysis in high seismic zones

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As someone who served on the Non building structures seismology
subcommittee, helped draft the IBC 2000 rack regulations, and sits on the
ANSI MH16.1 balloting committee, I can offer the following history:

1) the 1990 RMI was ANSI MH16.1 and is now withdrawn
2) the RMI has now written a new document which is a vast improvement over
the old.
3) They are trying to get it approved as a new ANSI MH16.1, but progress is
4) this new ANSI was expected to be approved in advance of IBC 2000
adoption, but hasn't happened, and I see no signs of it happening soon.
Therefore, IBC 2000 strictly has no rack regulations unless you revert back
to the 1990 ANSI. This is better than nothing, but not by much since it has
no seismic regulations.
5) The current RMI is not likely to get ANSI approval in its present form.
They have made some changes that are unacceptable to a broad class of users
and will not reach consensus as it is.
6) Minor changes in the RMI will allow consensus
7) if RMI is not adopted as an ANSI standard, the same group of people who
got it written into the IBC 2000 will submit a code change to get it out
and revert back to the 97 UBC regulations, which at least have seismic

Having fun yet Harold? No fishing for you yet.


Peter Higgins, SE