The following represents some General Notes that should be added to the construction documents in a deferred submittal. Download a printable PDF version of these notes here.
General Notes for Simpson Strong-Tie Strong-Rod Anchor Tiedown System
- The continuous rod tiedown system for this project shall be the Simpson Strong-Tie Strong-Rod Anchor Tiedown System (ATS) for shearwall overturning restraint.
- Simpson Strong-Tie shall provide the ATS to meet the design forces, total vertical displacement limit, and shrinkage requirements as set forth in the structural drawings. ATS calculations and installation details shall be provided to the designer or Engineer of Record for review and approval.
- Allowable rod capacities shall be calculated per American Institute of Steel Construction (AISC) Specification for Structural Steel Buildings.
- AISC 360 — 14th Edition for 2012 and 2015 International Building Code
- AISC 360 — 16th Edition for the 2018 International Building Code
- Bearing plate, wood stud and fastener capacities shall be calculated per the National Design Specification (NDS) for Wood Construction.
- NDS — 12 for 2012 International Building Code
- NDS — 15 for 2015 International Building Code
- NDS — 18 for 2018 International Building Code
- Shrinkage compensating devices shall be provided at each restraint location and account for the shrinkage amount at each story as set forth on the structural drawings.
- The total vertical displacement between restraint locations, including steel rod elongation and shrinkage compensating device deflection, shall be less than 0.20 inches or as set forth in the structural drawings, using allowable stress design (ASD). Steel rod elongation shall be computed as the product PL/AE, where P is the axial load (lb.), L is the initial rod length between restraint locations at the story under consideration (inches), E is 29,000,000 (psi) and A is the net tensile area of the rod (in.2). Shrinkage compensating device deflection shall be as specified in ICC-ES ESR-2320 including ΔR + ΔA (PD/PA).
- The ATS shall be restrained by a bearing plate and take-up device assembly at each story of the multi-story shearwalls. Note: Skipping stories, where bearing plates are omitted at intermediate floors that result in multiple stories being tied together, is prohibited.
- Do not weld products unless the ATS installation details specifically identify a product as acceptable for welding. Some steels have poor weldability and a tendency to crack when welded. Rods, nuts, and coupler nuts shall not be welded.
Details and Specifications
- In the event of a discrepancy between the structural drawings and the ATS installation details, the structural drawings shall govern.
- The structural drawings are specific to the Simpson Strong-Tie Strong-Rod Anchor Tiedown System (ATS) and are not applicable to other manufacturers’ continuous rod tiedown systems. Proposed substitutions of other manufacturers’ continuous rod tiedown systems shall be submitted to the designer or Engineer of Record for review and approval at the contractor’s expense. Submittal shall include evaluation reports indicating compliance with governing building codes and test data performed in accordance with ICC-ES Acceptance Criteria for Shrinkage Compensating Devices (AC316). In addition, submittal shall include installation details and instructions, calculations in accordance with the governing building codes, and certification by the manufacturer of compliance with these ATS specifications and the structural drawings.
- ATS run start/terminations shall be as set forth on the structural drawings. Alternate run start/terminations shall be submitted to the designer or Engineer of Record for review and approval prior to placement of the concrete and at the contractor’s expense. Submittal shall include calculations in compliance with the governing building code, including concrete anchorage in accordance with ACI 318 provisions for Strength Design and conversion to ASD load levels.
- The ATS is designed to be installed floor by floor as the structure is built. Installation in this manner, with shearwalls, will provide a lateralforce- resisting system during construction. The design and expense of alternative methods of temporary-lateral-force resisting systems are the responsibility of the contractor.
- A pre-construction meeting is recommended with Simpson Strong-Tie prior to placement of the concrete. The purpose of this meeting is to assist in verifying quantities and understanding the installation process. To coordinate this meeting, call Simpson Strong-Tie at (800) 999-5099.