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Re: building classes

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Hello Bob:

Thanks Bob, Ed and Harold for the reply. You are correct, the building is in
San Francisco and it is consistent with your descriptions. The owner has
always assumed that the class A status of the building meant that the
building was constructed to the highest standards of building construction.
One of the concrete encased steel beams that passes through the lightwell
decided to let go and it dropped several floors through the skylight of the
adjacent victorian. Luckily no one was using the bathroom at that time.
Coincidentally, the owner of the victorian is also a client of mine
...hmmmm??  Fortunately both clients have been very cooperative.

I would appreciate any thoughts on an appropriate repair and to make the fix
bullet proof. I want to specify the fix for all 12 light well beams. If one
is bad, they all could eventually deteriorate. One fix is to remove the
bottom 2-1/2" of concrete cover and replace with a bottom formed structural
grout with new drilled and epoxied bottom flange bolts and a wire grid and
epoxy inject all other cracks and install a new integral top coping
material. I have also considered a  Fibre Wrap around the entire beam, but
this seems very impractical due to access. Either way not an easy job
hanging from a 7th floor scaffold.

Regards
Jeff Smith

-----Original Message-----
From: Robert J Bossi <rjbossi(--nospam--at)sonic.net>
To: seaoc(--nospam--at)seaoc.org <seaoc(--nospam--at)seaoc.org>
Date: Monday, February 23, 1998 5:34 PM
Subject: Re: building classes


>
>
>Jeff Smith wrote:
>
>> I am working on some spawling repair to a 1927 seven story steel frame
>> building with concrete infill. The original plans indicate it is a "class
A"
>> steel frame building. Does anyone know where I can get information that
>> describes the requirements or specifications for a class A building?
>>
>> Regards,
>> Jeff Smith
>>   Jeff:
>
>I assume the building might be in San Francisco.  The "classes" are some
what
>similar to current code Types of Construction (ie Types I - V).
>
>The 1923 SF Building Code Section 74 defines  Class "A"  buildings as: "
those
>having fireproof frames of steel and with al structural parts of
incombustible
>materials.  Walls shall be of brick, stone, concrete or reinforced
concrete."
>
>Class "B" building have reinforced concrete carrying all wall and floor
loads.
>
>Class "C' buildings are typically UMBs or concrete equivalents.
>