Punching Shear Reinforcement


Dayton Shear Resistance (DSR) rails are typically used in post tension and reinforced concrete slabs with direct loading on the columns. Drop panels, beams and column capitals may be eliminated to allow efficient use of flying forms.

Installation of DSR is quick and easy. 
DSR rails can normally be installed around a column/slab connection in less than five minutes. Typical Installation Sequence:
  1. Attach the furnished chairs to the base plate of each SRS rail and place a chair top over the chairs at each end of the DSR rail.
  2. Properly position the DSR rails on the formwork as per placement drawings.
  3. Nail the chairs to the formwork using the blind holes in each chair leg.
  4. Repeat Steps 1, 2 and 3 for each DSR rail.

After the DSR rails are in place, the rebar, post-tensioning tendons, conduit and other embedded items may be set in the form. Since the tops of the DSR rails are open, it is easy to place rebar or tendons between the studs.
1. Dayton Shear Resistance must be placed and remain vertical in the slab.
2. Equally space DSR rails when two or more are required on a single column face.


  • Efficient
  • Saves Money
  • Versatile
  • Time, labor and material savings
  • Cost-effective
  • Eliminates the need for drop panels, beams and column capitals to make using flying forms efficient
  • Increases the punching shear capacity at the base of columns and in pile caps
  • Use in place of hairpins to eliminate congestion in post-tensioned tendon anchorage zones
  • One DSR can replace a series of hairpins
  • Reduce congestion around column connections
Product Code Packaging
127344 D141 PLASTIC DSR CHAIR - 3/4"
127345 D141 PLASTIC DSR CHAIR - 1"
Specific customer pricing may be available in Dayton Access. Minimum standard packaging sizes may apply.

PTC - Aztec® Tower Chair™

Accessories | Rebar Supports | Plastic Bar Supports