Strong-Rod Systems Seismic and Wind Restraint Systems Guide
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Strong-Rod™ Systems SEISMIC AND WIND RESTRAINT SYSTEMS GUIDE

Seismic and High-Wind Restraint Systems NEES-Soft test validates seismic retrofit solutions for soft-story buildings.

Your Full-Solution Partner Simpson Strong-Tie introduces the Strong-Rod™ continuous rod tiedown system for light-frame, multi-story wood construction. Our Strong-Rod Anchor Tiedown System for shearwall overturning restraint and Strong-Rod Uplift Restraint System for roofs address many of the design challenges specifically associated with multi-story buildings that must withstand seismic activity or wind events. Multi-story structures require a variety of special design considerations, and having a reliable, highly knowledgeable design partner is critical to keeping projects on time and...

Company Profile For nearly 60 years, Simpson Strong-Tie has focused on creating structural products that help people build safer and stronger homes and buildings. A leader in structural systems research and technology, Simpson Strong‑Tie is one of the largest suppliers of structural building products in the world. The Simpson Strong-Tie commitment to product development, engineering, testing and training is evident in the consistent quality and delivery of its products and services. For more information, visit the company’s website at www.strongtie.com. The Simpson Strong-Tie Company Inc....

Strong-Rod™ Anchor Tiedown System (ATS) for Shearwall Overturning Restraint Strong-Rod™ Uplift Restraint System (URS) for Roofs Let Simpson Strong-Tie Help Design Your System. Here’s how to reach us: • 800-999-5099 • www.strongtie.com/srscontact F-L-SRS15 © 2015 SIMPSON STRONG-TIE COMPANY INC.

Why Continuous Rod Tiedown Systems? Seismic and wind events are serious threats to structural integrity and safety. All wood-framed buildings need to be designed to resist shearwall overturning and roof-uplift forces. For one- and two-story structures, connectors (straps, hurricane ties and holdowns) have been the traditional answer. With the growth in multi-story wood-framed structures, however, rod systems have become an increasingly popular load restraint solution. Multi-story structures present complicated design challenges. Frequently, the structures have larger windows and entrances,...

Why Continuous Rod Tiedown Systems? Simpson Strong-Tie Strong-Rod™ Systems ® To ensure structural stability, a continuous rod tiedown system can be used in a multi-story wood-framed structure to resist shearwall overturning and roof uplift. Simpson Strong-Tie Strong-Rod™ Systems provide both an Anchor Tiedown System for shearwall overturning restraint (Strong-Rod ATS) and an Uplift Restraint System for roofs (Strong-Rod URS). Strong-Rod ATS solutions address the many factors that must be considered during design to ensure proper performance against shearwall overturning – such as rod...

Anchor Tiedown System Full-scale, five-story cyclic testing at the Simpson Strong-Tie® Tye Gilb Lab in Stockton, California.

Strong-Rod™ Anchor Tiedown System for Shearwall Overturning Restraint To complement its research and design expertise, Simpson Strong-Tie has all the components needed to build a continuous rod tiedown system optimal for withstanding shearwall overturning forces. From our threaded rod to our plates and nuts, to our latest shrinkage compensators and design services, we offer Designers a complete solution.

Anchor Tiedown System for Shearwall Overturning Restraint A continuous load path is integral to a building’s structural performance. Directing the diaphragm loads from roofs, floors and walls to the foundation in a prescribed continuous path is a widely accepted method to prevent shearwall overturning. The installation of continuous rod systems has grown in popularity with the increase in mid-rise (3- to 6-story) construction. Specifying a Strong-Rod™ Anchor Tiedown System (ATS) for shearwall overturning restraint from Simpson Strong-Tie offers several other advantages for Specifiers and...

What is the Load Path? Traditional vs. Continuous Rod Tiedown System A traditional shearwall relies either on holdowns or straps attached to posts to transfer the net shearwall overturning forces to the foundation. Lateral forces are transferred from the floor/roof to the plywood sheathing. The following steps describe the traditional load path: 1. Nails are typically used to transfer loads from the sheathing to the wall framing. 2. The outermost framing boundary elements transfer the tensile forces, resulting from the net overturning, to the holdown that is attached to the post at the...

Key Considerations for Designing an Anchor Tiedown System for Shearwall Overturning Restraint Strong-Rod™ ATS Shearwall Edge Shearwall Direction Incremental Bearing in Level 5 Restraint Bearing Plate Incremental Compression in Level 5 Studs/Posts Incremental Tension in Level 5 Rod Incremental Bearing in Level 4 Restraint Bearing Plate Ratcheting Take-up Device Assembly Expanding Screw Take-up Device Assembly Each Floor Level Cumulative Compression in Level 4 Studs/Posts Cumulative Tension in Level 4 Rod Incremental Bearing in Level 3 Restraint Bearing Plate B Rod Elongation A Wood Shrinkage...

International Building Code® (IBC) Section 2304.3.3 requires that Designers evaluate the impact of wood shrinkage on the building structure when bearing walls support more than two floors and a roof. It is important to consider the effects of wood shrinkage when designing any continuous rod tiedown system. As wood loses moisture, it shrinks, but the continuous steel rod does not, which potentially forms gaps in the system. See www.strongtie.com/srs for additional information regarding wood shrinkage and how Simpson Strong-Tie take-up devices mitigate wood shrinkage within an Anchor Tiedown...

D Bearing Plates Bearing plates are key components in transferring loads from the posts and top plates to the rods in an Anchor Tiedown System for shearwall overturning restraint. Bearing plates must be designed to spread the loads across the sole/sill plates to minimize the effects of wood crushing. These plates transfer the incremental bearing loads via compression of the sole/sill plates and bending of the bearing plates to a tension force in the rod. For additional information, visit www.strongtie.com/srs. E Anchorage by Designer Many variables affect anchorage design, such as...