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PA Purlin Anchor and Strap-Tie Holdown

PA

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Purlin Anchors

This product's information may differ depending on the category of use. You are currently viewing details related to Purlin Anchors. You can also view product information related to the category: Holdowns and Tension Ties for Cold-Formed Steel Construction

The PA is a solution for wood-to-concrete and wood-to-masonry connections which satisfies code requirements. The PA is designed to connect roof purlins to a concrete wall as a purlin anchor or to connect studs to the foundation as a strap-tie holdown. The PA features a dual-embedment line for ease of installation.

Key Features

  • Minimum embedment line indicators for both concrete and masonry installations
  • Nailing pattern optimized for narrow face of nominal 3x or double 2x wood member
  • Low design profile minimizes visibility

Material

  • 12 gauge

Finish

  • Galvanized or ZMAX® coating

Installation

  • Use all specified fasteners; some models have extra fastener holes. See General Notes.
  • Purlin anchor must hook around rebar.
  • Allowable loads are for a horizontal installation into the side of a concrete or masonry wall.
  • For vertical installation in the top of GFCMU, refer to engineering letter PA Models - Vertical Installation in the Top of GFCMU (L-C-PAGFCMUUP).
  • PA51/PA68 — for additional length, an MST strap can be attached using 1/2" bolts through existing holes.

Edge Distance — minimum concrete edge distance is 5". Minimum concrete-block left-to-right edge distance is 20".

Concrete Block Wall — the minimum wall specifications are:

A — one #4 vertical rebar, 32" long, 16" each side of anchor
B — two courses of grout-filled block above and below the anchor (no cold joints allowed)
C — a horizontal bond beam with two #4 rebars, 40" long, a maximum of two courses above or below the anchor
D — minimum masonry compressive strength, f'm = 1,500 psi

Related Literature

Product Information Table

Fastener Production Information and Stuff & Things
Model No. Ga. W (in.) L (in.) Coating/Material Packaging Qty.
PA18 12 2 1/16 18 1/2 Zinc Galvanized, G90 1
PA18Z 12 2 1/16 18 1/2 ZMAX® 1
PA23 12 2 1/16 23 3/4 Zinc Galvanized, G90 1
PA23HDG 12 2 1/16 23 3/4 Hot-Dip Galvanized 1
PA23Z 12 2 1/16 23 3/4 ZMAX® 1
PA28 12 2 1/16 29 Zinc Galvanized, G90 1
PA28Z 12 2 1/16 29 ZMAX® 1
PA35 12 2 1/16 35 Zinc Galvanized, G90 1
PA35Z 12 2 1/16 35 ZMAX® 1
PA51 12 2 1/16 51 Zinc Galvanized, G90 1
PA51Z 12 2 1/16 51 ZMAX® 1
PA68 12 2 1/16 70 Zinc Galvanized, G90 1
PA68Z 12 2 1/16 70 ZMAX® 1

Load Tables

    These products are available with additional corrosion protection. Additional products on this page may also be available with this option, check with Simpson Strong-Tie for details.

Wind and SDC A&B — Allowable Tension Loads (160)
Max. Ledger Size Model No. Strap Length, L (in.) Embed Length, le (in.) Uncracked Concrete Cracked Concrete GFCMU Wall Max. Allowable Strap Tension Deflection at Allowable Load (in.)
Concrete GFCMU Required Nails (in.) Tension Required Nails (in.) Tension Required Nails (in.) Tension
4x Ledger PA18 18 1/2 4 6 (12) 0.148 x 3 2,430 (12) 0.148 x 3 2,260 (12) 0.148 x 3 1,890 NA 0.087
PA23 23 3/4 4 6 (16) 0.148 x 3 3,220 (12) 0.148 x 3 2,260 (16) 0.148 x 3 2,815 NA 0.118
PA28 29 4 6 (16) 0.148 x 3 3,230 (12) 0.148 x 3 2,260 (16) 0.148 x 3 2,815 NA 0.085
PA35 35 4 6 (16) 0.148 x 3 3,230 (12) 0.148 x 3 2,260 (16) 0.148 x 3 2,815 NA 0.085

See Footnotes1 below

SDC C-F — Allowable Tension Loads (160)
Max. Ledger Size Model No. Strap Length, L (in.) Embed Length, le (in.) Uncracked Concrete Cracked Concrete GFCMU Wall Max. Allowable Strap Tension Deflection at Allowable Load (in.)
Concrete GFCMU Required Nails (in.) Tension Required Nails (in.) Tension Required Nails (in.) Tension
4x Ledger PA18 18 1/2 4 6 (12) 0.148 x 3 2,430 (12) 0.148 x 3 1,980 (12) 0.148 x 3 1,890 3,220 0.087
PA23 23 3/4 4 6 (14) 0.148 x 3 2,830 (12) 0.148 x 3 1,980 (16) 0.148 x 3 2,815 3,220 0.118
PA28 29 4 6 (14) 0.148 x 3 2,830 (12) 0.148 x 3 1,980 (16) 0.148 x 3 2,815 3,935 0.085
PA35 35 4 6 (14) 0.148 x 3 2,830 (12) 0.148 x 3 1,980 (16) 0.148 x 3 2,815 3,935 0.085

Footnotes1

  1. Allowable loads have been increased for wind or earthquake loading with no further increase allowed. Reduce where other loads govern.
  2. Deflection listed is at the highest allowable load.
  3. Multiply seismic and wind ASD load values by 1.43 or 1.67, respectively, to obtain LRFD capacities.
  4. Nail quantities are based on Douglas fir (DF) or equivalent specific gravity of 0.50 or better. For use in spruce-pine-fir (SPF) or hem fir (HF), nails quantities shall be increased by 1.15 to achieve loads listed.
  5. For wall anchorage systems in SDC C-F, the maximum strap allowable load shall not be less than 1.4 times the ASD anchor design load.
  6. Minimum center-to-center spacing is 3x the required embedment — i.e., standard installation is based on a minimum 5" end distance.
  7. Structural composite lumber beams have sides that show either the wide face or the lumber strands/veneers. Values in the tables reflect installation into the wide face.
  8. Concrete shall have a minimum compressive strength of f'c = 3,000 psi.
  9. Grout-filled CMU (GFCMU) shall have a minimum compressive strength of f'm = 1,500 psi.
  10. PA models installed vertically in the top of a grouted masonry wall with 6" embedment and (12) 0.148" x 3" nails achieve an allowable uplift load of 1,890 lb.
  11. For PA models, 0.148" x 1 1/2" nails may be substituted for 0.148" x 3" nails at 100% of listed load and with a 15% increase in deflection. For installation over sheathing, use 3"-long nails minimum.
  12. Fasteners: Nail dimensions in the table are listed diameter by length. For additional information, see Fastener Types and Sizes Specified for Simpson Strong-Tie Connectors.

 

    These products are available with additional corrosion protection. Additional products on this page may also be available with this option, check with Simpson Strong-Tie for details.

    Many of these products are approved for installation with Strong-Drive® SD Connector screws.

PA Strap-Tie Holdown Load Table
  1. Allowable loads have been increased for wind or earthquake loading with no further increase allowed. Reduce where other loads govern.
  2. Concrete shall have a minimum compressive strength of f'c = 2,500 psi.
  3. Masonry applications require grout-filled CMU with minimum compressive strength of f'm = 1,500 psi.
  4. Deflection at highest allowable load is as follows: PA51 and PA68 = 0.10".
  5. PA allowable lateral loads are F1 = 795 lb. and F2 = 280 lb.
  6. #9 x 1 1/2" Strong-Drive® Connector screws (SD9) may be substituted for table fasteners with no load reduction.
  7. Fasteners: Nail dimensions in the table are listed diameter by length. For additional information, see Fastener Types and Sizes Specified for Simpson Strong-Tie Connectors.

Code Reports & Compliance

Drawings

PDF DWG DXF RFA IFC SAT