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Re: WOOD MOMENT FRAMES

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I guess I'm the only one who believes that a structure designed using
"flagpoles" needs to use an Rw=3. Or maybe it's just that my head's already
into 1997 UBC. I recall that I have seen this provision somewhere referred
to as "inverted pendulums" (maybe SEAOSC blue book?).

Regards,
Bill Allen

-----Original Message-----
From: Dennis S. Wish <wish(--nospam--at)cwia.com>
To: seaoc(--nospam--at)seaoc.org <seaoc(--nospam--at)seaoc.org>
Date: Friday, April 10, 1998 2:00 PM
Subject: RE: WOOD MOMENT FRAMES


>I agree with the information you received from Charles Greenslaw - you
>really can not create the rigidity and stiffness you need at the connection
>of wood to wood.
>The closes you can come is to create two flag pole conditions by embedding
>the wood into a post hole foundation (similar to a fence post design)
>however, be cautious since even redwood will begin to rot out after
>sufficient time.
>The first consideration is that the seismic zone makes very little
>difference here since wind will most likely govern. You still need to
>distribute wind loads proportionately.
>Depending upon the magnitude of your reaction at each post, and the
diameter
>or depth of the steel column (assuming a Pipe - standard, extra strong or
>double extra strong - or TS tube steel section) you can use either a grade
>beam or embedded post foundation. If the steel section is small enough, I
>would suggest cladding wood veneer with stud pins to the outside face of
>steel and essentially creating what appears to be a wood column.
>This will give you a connection that should last the test of time and
>provide sufficient restraint for your wind loads.
>Regards
>Dennis S. Wish PE
>La Quinta, California
>wish(--nospam--at)cwia.com
>
>ICQ# 6110557
>http://wwp.mirabilis.com/6110557
>
>"The death of democracy is not likely to be an assassination from ambush.
It
>will be a slow extinction from apathy, indifference, and undernourishment."
>Robert Hutchins
>
>-----Original Message-----
>From: RDAHLMANN [mailto:RDAHLMANN(--nospam--at)aol.com]
>Sent: Thursday, April 09, 1998 9:04 PM
>To: seaoc(--nospam--at)seaoc.org
>Subject: WOOD MOMENT FRAMES
>
>
>I HAVE A CLIENT WHO WANTS TO USE A WOOD BEAM IN CONJUNCTION WITH STEEL
>COLUMNS
>TO CREATE A MOMENT FRAME. THIS IS RESIDENTIAL CONSTRUCTION IS SEISMIC ZONE
>2.
>I AM VERY HESITANT DUE TO:
>1. THE ENORMOUS AMOUNT OF BOLTS REQUIRED AT EACH END
>2. THE IMPRACTICALITY OF EXPECTING RESIDENTIAL CARPENTERS TO GET THE BOLT
>HOLES EXACTLY RIGHT (SINCE THE BOLT HOLE WILL NEED TO BE SNUG WITH THE
BOLTS
>IN ORDER TO MAINTAIN A RIGID CONNECTION)
>3. THE POSSIBLE FUTURE ELONGATION OF THE BOLT HOLES DUE TO CONTINUES MOTION
>OVER THE YEARS.
>
>IF ANYONE HAS ANY SUGGESTIONS, THEY WOULD BE GREATLY APPRECIATED.
>
>RICHARD DAHLMANN, P.E.
>
>
>
>
>
>