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FW: Reinforcement detailing in coupling beam

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Frank:

It would seem that there are two pieces of evidence in your explanation that
may be at odds with one another:

1)  You have a steel column between the wall piers
2)  You are thinking of detailing the coupling beam, which spans between the
wall piers, with diagonal (strut) reinforcement.

IF you have a steel column between the wall piers, then it seems likely that
the span for the coupling beam is fairly long--> requiring the column.

BUT, if the span is fairly long (more than 4 times the depth of the coupling
beam), diagonal struts aren't really going to enter the picture, since they
are used in deep members with short spans.  The response of the coupling
beam will be primarily in flexure, and it can be designed as basically a
ductile flexural member.

HOWEVER, if the span really is short, and diagonal struts are required, then
it would seem that the steel column would NOT be required, since the span is
short.

Perhap you could give a bit more detail as to the actual situation, such as
wall thickness, spans, beam width and depth, steel column dimensions etc.
Generally speaking, I have found the design of diagonal struts in short span
coupling beams is fairly straight forward, the detailing is usually more
difficult (since the coupling beam struts must be developed within the wall
end piers, requiring a fairly thick wall BE or something else to contain the
beam steel), and building them can really be a challenge, unless the
contractor is familiar with this type of construction.


Regards,

T. Eric Gillham PE

-----Original Message-----
From: Fariborz Tehrani [mailto:fmtehrani(--nospam--at)yahoo.com]
Sent: Saturday, October 27, 2001 7:53 AM
To: seaint(--nospam--at)seaint.org
Subject: Reinforcement detailing in coupling beam


Hi everyone,
I'm trying to detail a coupling shear wall per
"Seismic Manual, Vol. 3". A steel column is located
between wall piers, crossing the coupling beam (Steel
column is carrying gravity loads only).

Wall thickness is only few inches more than column
section depth. So, how can I detail coupling beam
reinforcement, specially diagonal bars?

I appreciate any comment and/or help on this issue.
Thanks in advance,
Frank



=====
Fariborz Tehrani,                      Phone: (310)801-4237
Civil Engineer                           Fax: (530)481-9532
BSCE, MSCE, PE                    Voice Mail: (877)743-6206
email: fmtehrani(--nospam--at)msn.com
web: www.fmtehrani.com

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