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Re: Retrofit of Existing RC Spread Footings for Additional Loads

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Hola, soy dominicano y recibo los e-mail de esta lista, me interesa la
literatura que usted menciono de la patologia estructural.  Llevo varios
meses buscando informacion de patologia y en mi pais hace dos años se
realizo un simposio de esa area de la ingenieria y se esta realizando el
segundo.  Se espera la asistencia del Prof. Calavera (español) una de las
personas que mas ha escrito sobre ese tema, pues posee una biblioteca
amplia.  Favor contestarme y decirme como puedo conseguir esa literatura.


Carlos Garcia
----- Original Message -----
From: Vincenzo Valerio <enmar(--nospam--at)>
To: <seaint(--nospam--at)>
Sent: Monday 21 de December de 1998 7:01 PM
Subject: RE: Retrofit of Existing RC Spread Footings for Additional Loads

>Dear Mr. Rogers:
>I have had the opportunity do to a job exactly like the one yuo are
>This design was done back in 1990 and the only reference I found was a
>spanish book called "Patología y Terapéutica del Hormigón Armado", by Mr.
>Fernández Cánovas. If you can read spanish I could e-mail you some
>Anyway the job consisted in guessing the existing loads and adding the new
>loads on a different pier and the do a combined footing analisys using
>finite element analisys.
>We required some core test from the old concrete slab, and we removed the
>existing concrete exposing the rebar, then we applied epoxy (I think it
>COLMA FIX, but now it has a different name), and we casted the new concrete
>again. During this process we had to temporary support the existing
>By the way, we could not use piles, and since the work was inside a
>petrochemical process plant in function, welding was not allowed.
>The only thing you have to remenber is that when you modify somebody elses
>foundation, you automatically become responsible of that building. In our
>case was the same owner. What about your case?
>Ing. Vincenzo Valerio
>Enmar Representaciones y Asesorias, C.A.
>Caracas, Venezuela.
>Tel: 58-2-238-5253 ; Fax: 58-2-237-1101
>E-mail: enmar(--nospam--at)
>-----Original Message-----
>De: Robert Rogers <>
>Para: SEAINT(--nospam--at)SEAINT.ORG <SEAINT(--nospam--at)SEAINT.ORG>
>Fecha: Lunes 21 de Diciembre de 1998 02:45 PM
>Asunto: Retrofit of Existing RC Spread Footings for Additional Loads
>> I have recently searched the SEAINT E-Mail Archive for any information on
>> modifying existing reinforced concrete spread footings to carry
>> column loads.  Although I have found some posts they have provided little
>> information which I could extract for useful purposes.  I have also
>> a search of COMPENDEX for similar information.  My success has been
>> When placing new columns right beside an existing line of spread footings
>> (interconnected by strip footings) substructure interferences abound.  In
>> one particular case, the spread footing protrude 5 to 8 ft. into a new
>> building area (where new columns are coming down).  I am searching for
>> good references (journal articles, practice periodicals, etc.) which
>> with the design/analysis methodology of increasing the plan dimensions of
>> the existing footings to pick-up and carry the new columns loads.  I know
>> will end up with a combined mat footing which could dictate a slab on an
>> elastic foundation analysis.
>> I am more interested in connection details (new concrete to old, cap
>> over the existing foundation, etc.).  I have found one article in the
>> Transportation Research Record (No. 1476, Seismic Retrofitting of Bridge
>> Substructures) which was helpful.  Can anybody else point me in a good
>> direction or offer some advice ?
>> Thanks
>> P.S (use of piles or caissons cannot be used).