Structural Components and Systems

For The Seismic Retrofit of Tilt-up Buildings


The Pi-Glu pilaster anchorage system was specifically designed and developed for retrofit pilaster anchorage applications in tilt-up buildings. Pi-Glu features include the following:
  • Standardized System: The Pi-Glu system consists of standardized components that are incorporated into standardized installations.
  • Direct Connection: The Pi-Glu provides for a direct connection between the pilaster and the glulam beam.
  • Components: The Pi-Glu systems typically consist of a Pilaster Bracket, a Glulam Bracket, and a strut elements that interconnects the two brackets. The Pilaster Bracket is typically attached to the pilaster with epoxy anchors. The Glulam Bracket is typically attached to the bottom of the glulam beam with 5/8" x 6" lag bolts.
  • Field Adjustable: The Pi-Glu design allows for the location of the Pilaster and Glulam Brackets to be field adjusted to avoid interference problems, as may occur with wall reinforcing, piping, and conduits.
  • Bi-directional Load Capacity: The Pi-Glu system is designed to resist loads in both tension and compression.
  • Field Fabrication: The Contractor is required to field cut and drill both ends of the strut element. This is typically done with a portable band saw or a dry cut-off saw, and a magnetic base drill.
  • Strut Element: The strut elements typically consists of a TS3x3x3/16 tube steel section, and can be taken from the Flare Strut drops (when Flare Struts are also being installed, and the drop is of sufficient length).
  • Capacity: The maximum capacity of the Pi-Glu system is 33,000 lbs. Note that the actual capacity of a Pi-Glu installation can be substantially less than this, and is typically limited by the capacity of the anchors associated with the Pilaster Bracket, or the attachment of the Glulam Bracket to the glulam beam.
  • Steel Beams and Plate Girders: For Pi-Glu installations with steel beams and plate girders, the Glulam Bracket can be replaced with a Steel Bracket, and bolted directly to the bottom flange of these members. The bolt holes in the flange are typically drilled with a magnetic base drill.

For more information, load tables, design information, installation guidlines, and cad drawings, please contact Mercalli XII.