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Re: old building with "Kahn reinforcing" floor system

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This system was in use in Pakistan in the 50's and in the less accessible areas up to 70's and 80's. It was called Reinforced Brick Concrete or RBC. I have inspected buildings constructed to this system, although I never met the engineers who designed them. Sometimes, lime would replace cement in the concrete. I suspect it was mostly non-engineered in the sense that skilled masons did the designing on their own. The roof was supported on lime mortar brick masonry. When the span of a room would go up, steel girders would be used in the middle.
Syed Masroor
Karachi, Pakistan
----- Original Message -----
Sent: Friday, February 24, 2006 3:05 AM
Subject: old building with "Kahn reinforcing" floor system

We are currently working on a building that has a floor system using Kahn reinforcing.  It is constructed with the reinforcing at 16” o.c. spanning one direction and clay tiles in between the bars as a filler on the bottom.  The floor was then poured so that we have a T-beam type system with a 5” topping slab and a five inch web.  The overall depth of the system is about 12”


We understand that they used this system in Europe quite a bit and called it “pot construction”


Has anyone run into this system or have any information relating to it.  We are trying to determine a capacity without doing a load test or at least get in the ballpark before we do a load test.


Thank you in advance for any information.


I did see a thread from someone who indicated this was discussed in the 1919 Concrete Engineering handbook.