Symmetrical Compression Post | Canada

Compression Post Recommendations

As the Strong-RodTM Anchor Tiedown System (ATS) for shearwall overturning restraint undergoes tension loads, it is important to specify adequate compression elements to resist the compression loads. They comprise a pair of posts or built-up studs at each side of the Strong-Rod ATS. Simpson Strong-Tie has provided two options for post configurations. The configuration is determined by the Designer based on design and construction preference.

Specifications of studs and posts are the responsibility of the Designer. Simpson Strong-Tie has provided recommendations of post configurations. The distribution of edge nailing is important to transfer the loads appropriately. The following are some examples of recommended nail distribution between posts.

Symmetrical Posts: An equal number of posts or studs on each side of the Strong-Rod.

Symmetrical Posts

Moment Arm = center of rod to center of rod

Nailing Example: (4) total compression members: 2" o.c. edge nailing x 4 = 8" o.c. nailing at each compression member.

Symmetrical Compression Posts (Multiple 2x Members) Perpendicular and Parallel to Grain Factored Resistance for D.Fir-L

Lumber based on 2x_ D.Fir-L No.1/No.2 grade. See General Notes (below) for additional information.

Symmetrical Compression Posts (Multiple 2x Members) Perpendicular and Parallel to Grain Factored Resistance for S-P-F

Lumber based on 2x_S-P-F No.1/No.2 grade. See General Notes for additional information.

General Notes

1. Bearing loads are perpendicular-to-grain values and include bearing factor K_B and size factor K_ZCP.
2. Perpendicular- and parallel-to-grain values include K_D = 1.15 load increase.
3. Calculations based on K_e = 1.0 for parallel-to-grain resistance in depth direction of stud.
4. Calculations assume K_H = 1.10 with wall sheathing providing lateral restraint against buckling in 38 mm direction of stud.
5. Fastening of studs to wall sheathing and wall sheathing specifications to be provided by Design Professional, not by Simpson Strong-Tie.