PA/HPA Purlin Anchors
Holdowns and Tension Ties for Cold-Formed Steel Construction
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PA/HPA purlin anchors offer solutions for CFS to concrete and concrete block connections which satisfy code requirements. The PA's dual embedment line allows installation in concrete or concrete block.
Material
- PA — 12 gauge; HPA — 10 gauge
Finish
- Galvanized; PAs available in HDG 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.
- Strap may be bent one full cycle. (Bent vertical 90° then bent horizontal.)
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
Options
- See LTT, HTT and S/LTT, S/DTT tension ties for alternate retrofit solutions
Codes
ASCE 7-10 12.11.2.2.5 states:
... Diaphragm to structural wall anchorage using embedded straps shall be attached to, or hooked around the reinforcing steel or otherwise terminated so as to effectively transfer forces to the reinforcing steel.
Related Links
Wood Construction
Cold-Formed Steel Construction
Corrosion Information
Catalog Pages
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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.
- Loads may not be increased for short-term loading.
- For concrete installs, the minimum compressive strength, f'c = 3,000 psi.
- Multiply Seismic and Wind ASD load values by 1.4 or 1.6 respectively to obtain LRFD capacities.
- In accordance with 2006 and 2009 IBC Section 1613.1, detached one- and two-family dwellings in Seismic Design Category (SDC) C may use "Wind and SDC A&B" allowable loads.
- Minimum center-to-center spacing is 3 times the required embedment (Smin = 3 x le) for PA/HPAs acting in tension simultaneously, where le = embedment depth. Standard installation is based on minimum 5" end distance.
- Install fasteners symmetrically and with a minimum of 4 of the required fasteners between the embedment line and the first tooling hole. In some cases, not all of the fastener holes will need to be filled.
- Per ASCE7-10, 12.11.2.2.2, for diaphragms in structures assigned to SDC C-F, maximum allowable strap tensile capacity shall be no less than 1.4 times the design load. Not applicable (NA) for Wind and SDC A&B designs.
- See more information on Simpson Strong-Tie fasteners.
Code Reports
| Part | IAPMO UES ER | ICC-ES ESR | City of Los Angeles | State of Florida |
|---|---|---|---|---|
| HPA | See specific model numbers for code listings. | |||
| HPA28 | ESR-2920 ESR-2523 | FL13326 | ||
| HPA35 | ESR-2920 ESR-2523 | FL13326 | ||
| PA | See specific model numbers for code listings. | |||
| PA18 | ESR-2920 ESR-2523 | FL13326 FL13904 | ||
| PA23 | ESR-2920 ESR-2523 | FL13326 FL13904 | ||
| PA28 | ESR-2920 ESR-2523 | FL13326 FL13904 | ||
| PA35 | ESR-2920 ESR-2523 | FL13326 FL13904 | ||
ESR-2523 is an Index of many of Simpson Strong-Tie Stamped and Welded Cold-formed Steel Products for Wood or Cold-formed Steel Construction |
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Drawings
| Part | Orthographic | Perspective |
|---|---|---|
| HPA | None | |
| HPA28 | None | |
| HPA35 | ||
| PA | None | |
| PA18 | None | |
| PA23 | None | |
| PA28 | ||
| PA35 | None |
