## Shear Reinforcement

## Shear Reinforcement

(OP)

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.

Any help or examples would appreciated.

## RE: Shear Reinforcement

## RE: Shear Reinforcement

## RE: Shear Reinforcement

## RE: Shear Reinforcement

## RE: Shear Reinforcement

Michael.

Timing has a lot to do with the outcome of a rain dance.

## RE: Shear Reinforcement

@shrews34, i was also interested at this topic one time.

you can look at ACI318 chapter 17.

you may also use example 12.6 of PCA notes as a guide.

also reinforced concrete by wight and macgregor chapter 16 composite concrete beams

## RE: Shear Reinforcement

Is your foundation a slab or a series of beams? If a slab, you may be able to achieve the horizontal shear required by just roughening. If beams, then the inserted stirrups would be required.

## RE: Shear Reinforcement

1. Specify the existing surface to be scabbled.

2. Drill and epoxy L-bars across the interface (or U-bars as per SEIT suggested). Because you have one foot to work with you should be able to achieve full development of the reinforcement across the joint.

3. Apply a bonding agent (see Parchem or Sika who will have products which can be used).

4. Run through the calculations for longitudinal shear to ensure the section can behave compositely.

Regards and all the best.

## RE: Shear Reinforcement

you may want to add more dowels between the ends and the maximum moment (somewhere in the middle) for a more composite action.

## RE: Shear Reinforcement

## RE: Shear Reinforcement

BA