I have and existing foundation in a Chemical Plant that originally supported a flat bottom tank. The client wants to use this foundation to support a tank with a skirt. This new loading will reverse the bending moment of the original design. In order to get the required depth and be able to install the new tension reinforcing in the top, we need to add a one foot section to the top of the foundation. Connecting the new section to the old section will require horizontal shear reinforcing. I have never calculated reinforcing of this type and have been unable to find a good reference or example that shows the calculation process in detail. Any help or examples would appreciated.
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