Post-Installed Anchorage Solutions for Holdowns and Bases for use with Cold-Formed Steel
Simpson Strong-Tie Anchor Systems® products offer several post-installed anchorage solutions for holdowns and bases. Often times these products are used when cast-in-place anchors are omitted or mislocated, or in retrofit applications. The following design values provide solutions to common applications encountered in the light frame construction market.
For complete information on product performance, installation requirements and appropriate code listings for Anchor Systems products please refer to the specific web pages for Simpson Strong-Tie Anchor Systems Adhesives, Mechanical Anchors, and Powder-Actuated Fastening Systems . Also refer to Important Instructions to the Designer.
See Corrosion Information for general corrosion information.
SEISMIC VALUES: IBC Section 1908.1.16 requires that concrete anchors in Seismic Design Categories C through F be governed by the strength of a ductile steel anchor. Anchors noted as limited by the steel capacity satisfy this requirement (footnote 9). Alternately, for anchor solutions limited by the concrete capacity, the IBC requires that either the attachment to the structure shall undergo ductile yielding at a load level less than the anchor design capacity, or the anchor strength shall be at least 2.5 times the demand force.
Anchoring Adhesive Solutions
Shear Loads for Threaded Rod in Normal-Weight Concrete
Tension Loads for Threaded Rod in Normal-Weight Concrete
- Anchorage designs conform to ACI 318 Appendix D and assume cracked concrete with no supplementary reinforcement.
- Allowable Stress Design (ASD) values are obtained by dividing Load Resistance Factor Design (LRFD) capacities by 1.4 for seismic and 1.6 for wind.
- Load values based on the following: minimum concrete strength of 2,500 psi, dry hole temperature range 1 and continuous special inspection. Reference ICC-ES ESR-2508 for further information.
- Shear load is applied parallel to the edge of concrete. Anchor is considered as an individual anchor without influence from other anchors.
- Cold-Formed Steel (CFS) shear values are based on 2001 AISI NAS, Eq. E3.3.1-1, mf = 0.75, Ω=2.5. Reference General Notes for CFS properties. To convert from ASD to LRFD multiply value by 1.5.
- Governing shear load is the lesser of concrete and CFS. Governing tension load is the lesser of concrete and steel.
- For conditons not covered by these tables use Simpson Strong-Tie Anchor Selector™ Software for ACI 318.
- Third and fourth edge distances must be ≥ 1.5 x Embedment Depth.
- Failure mode governed by ductile steel rod (A307 Grade C).
- LRFD steel strength based on ACI 318 Appendix D. ASD steel strength based on AISC Steel Construction Manual, 13th Edition, Fu=58 ksi.
- Wind design includes SDC A & B.