IMO, addinbg a steel frame around the new opening does nothing at all
structurally. If the remaining wall can take current code seismic loads for
"in-plane" loading, then what I do is check to make sure the remaining
masonry above the opening can be used as a header, and then add full-height
steel tube girts at each side of the opening and epoxied or thru-bolted to
the CMU, (to take the place of the jamb steel that isn't there). The steel
tube girts are designed for the out-of-plane froces based on the current
code.
Hope this helps.
Larry Hauer, S.E.
>From: "Pinyon Engineering" <Pinyonengineering@hughes.net>
>Reply-To: <seaint@seaint.org>
>To: <seaint@seaint.org>
>Subject: cutting a window into concrete block wall
>Date: Fri, 17 Aug 2007 10:08:50 -0700
>
>I have a client that wants to install a window in an existing block wall.
>what is the best way to install reinforcing steel around the opening. I
>have called out for a steel frame around the window and drilled 24" all
>thread epoxy anchors around where the code asks for extra steel. is there
>a reference book for this out there or any suggestions.
>This is in a 1974 era building -soild grouted and minimal steel -wood roof
>and 2nd floor - in seismic zone 4 - I am checking that I have enough shear
>wall.
>
>Tim Rudolph
>Pinyon Engineering
>Bishop CA
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