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FW: MASN - CUTTING OPENING IN EXISTING CMU WALL

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I forgot to mention in my previous post that the steel support detail I
mentioned is probably only good in seismic zones -1, 0 and maybe 1  :o)

> ----------
> From: 	James Hagensen[SMTP:JHAGENSEN(--nospam--at)HNTB.com]
> Sent: 	Thursday, August 28, 1997 5:46 PM
> To: 	seaoc(--nospam--at)seaoc.org
> Subject: 	RE: MASN - CUTTING OPENING IN EXISTING CMU WALL
> 
> ----------------------------------------------------------------------
> ----
> Your following message has been delivered to the list
>   seaoc(--nospam--at)seaoc.org at 04:15:54 on 29 Aug 1997.
> ----------------------------------------------------------------------
> ----
> 
> 
> I have seen a detail using double angles with the vertical legs of the
> angles at the center of the CMU wall.  Cut blocks are installed on
> both
> sides of the angles.  I hate angles in bending, however, so I might
> opt
> for two C8 channels (height of a block course) back to back using the
> same approach.  You could also use a continuous plate welded to the
> bottom of the channel bottom flange  to help support the cut infill
> blocks if necessary.  (If angles are used, the bottom horizontal leg
> can
> be selected to perform the same function.)  Hopefully I'm making
> sense.
> (Note that I am also assuming that a double door frame exists to cover
> the bottom angle leg or channel bottom flange and that adequate
> bearing
> is provided either side of the door opening for the steel elements.)
> Hopefully this helps.
> 
> Jim Hagensen, SE  
> 
> > ----------
> > From: 	rlewis(--nospam--at)techteam.org[SMTP:rlewis(--nospam--at)techteam.org]
> > Sent: 	Thursday, August 28, 1997 2:50 PM
> > To: 	seaoc(--nospam--at)seaoc.org
> > Subject: 	MASN - CUTTING OPENING IN EXISTING CMU WALL
> > 
> > I have an existing 10" CMU wall I would like to cut an opening in.
> > The wall
> > is not grouted.  It supports floor framing about 2'-8" above the
> > opening,
> > plus additional wall height.  I would like to cut a double door into
> > the
> > wall.  Since the opening is so large relative to the distance of the
> > floor
> > load above, the floor load  must be support on the lintel (within
> the
> > 45
> > degree triangle).  I would like to cut the opening into the wall on
> > one face
> > at a time.  I have checked precast concrete lintels but the shear is
> > just too
> > much.
> > 
> > Does anybody have a good procedure for cutting openings into
> existing
> > walls
> > supporting loads greater than the triangle arch above?  Any 2 piece
> > steel
> > detail that would not leave exposed steel?
> > 
> > Thanks for your help and input.
> > __________________________________________________
> > 
> > Richard Lewis, P.E.
> > Missionary TECH Team
> > rlewis(--nospam--at)techteam.org
> > 
> > The service mission like-minded Christian organizations
> > may turn to for technical assistance and know-how.
> > 
> > 
> > 
> 
> 
> 

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