The Strong-Rod™ Anchor Tiedown Systems (ATS) offer safe and tested continuous rod tiedown solutions for multi-storey, timber-frame construction in seismic and high-wind areas.
To complement its research and design expertise, Simpson Strong‑Tie has all the components needed to optimally design and build a continuous rod tiedown system 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.
Features & Benefits
- Easy to install
- An ATS restraint provides the high load capacities required for mid‑rise timber (3‑ to 6‑storey) construction
- Directing the diaphragm loads from roofs, floors and walls to the foundation in a prescribed continuous load path
- System components provide low deflection to help limit shearwall drift
- Steel tension elements of the structural lateral force resisting system
- Our knowledge of rod system performance through years of testing ensures that all system design considerations have been met
RTUD Ratcheting Take‑Up Device
The RTUD ratcheting take‑up device is a cost‑effective shrinkage compensation solution for continuous rod systems. The RTUD is code‑listed for use with rod systems to ensure highly reliable performance in a device that allows for unlimited shrinkage. The RTUD should be hand installed until the base of the device fully bears on top of the BPRTUD. Once the fastener holes are aligned and the RTUD is flush, install the Strong‑Drive® fasteners. Once the RTUD is installed, a series of internal threaded wedges enable the device to ratchet down the rod as the timber structure shrinks, but engage the rod in the reverse direction under tensile loading. Engagement is maintained on the rod by the take‑up device, enabling the rod system to perform as designed from the time of installation.
ATUD/TUD Take‑Up Device and Bearing Plates
The ATUD (Aluminium) and TUD (Steel) expanding take‑up devices are suitable for rod diameters from 1/2" (13 mm) up to 1 3/4" (45 mm) and shrinkage up to 75 mm. Expanding screw‑style take‑up devices provide the lowest device displacements. For installation, ensure that the activation pin is pointing up and facing toward the inside of the building space. The pin can be pulled anytime after the nut has been tightened onto the top bearing plate and must be pulled by the time the building is fully loaded. Shrinkwrap should remain on the device until the pin is ready to be pulled. Before activating an ATUD make sure the pin on the take‑up device on the floor below has been pulled.
CNW and ATS-C coupler nuts are used to connect one threaded rod to another and connect to anchor bolts within the Strong-Rod Anchor Tiedown System for shearwall overturning restraint. Couplers are available in same rod size each end, as well as reducing couplers to allow for stepping of rod sizes up the rod run. Couplers are typically sufficient as black steel however a hot-dip galvanised option is available.
Steel Strong‑Rods and Steel Fully Threaded Rods
Strong‑Rod threaded rods are the tension transfer element within the Anchor Tiedown System for shearwall overturning restraint. Strong‑Rod threaded rods are threaded on both ends, with the top end having 305 mm or 1 219 mm of thread to allow for the distance that the rod sticks through the device. Information clearly etched on the shank allows easy identification in the field.
Shallow Podium Slab Anchor Kit
The Shallow Podium Slab anchor kit includes the patented Anchor Bolt Locator (ABL) and patent‑pending Shallow Anchor Rod (SAR). Uniquely suited for installation to concrete‑deck forms, the ABL enables accurate and secure placement of anchor bolts. The structural heavy hex nut is attached to pre‑formed steel and becomes the bottom nut of the anchor assembly. The shallow anchor is provided with a plate washer fixed in place that attaches on the ABL nut when assembled and increases the anchor breakout and pullout capacity. The shallow anchor is easily installed before or after placement of the slab reinforcing steel or tendons. Where higher anchor capacities are needed such as at edge conditions or to meet seismic ductility requirements, the anchor kit is combined with anchor reinforcement.
- SAR Shallow Anchor Rod
SAR anchor rods are for use with the ABL anchor bolt locator. They combine to make an economical podium‑deck anchorage solution. Anchorage specification is per Designer.
- ABL Anchor Bolt Locator
The ABL enables the accurate and secure placement of anchor bolts on concrete‑deck forms prior to concrete placement. The structural heavy hex nut is attached to a pre‑formed steel "chair," which eliminates the need for an additional nut on the bottom of the anchor bolt.
The rod‑to‑steel‑beam connector (ATS‑SBC) features a preattached high‑strength steel threaded rod and weldable plate for use on projects where the run is to be anchored to steel beams. The new connector reduces the number of components from seven to two, saving contractors installation time and cost. The design of the steel beam and the stiffeners are the responsibility of the Designer.
The WBP timber‑beam plate is for projects where the rod run attaches to timber beams. The centre hole of the bearing plate has internal threads to receive the threaded rod from above, and the plate spreads the load across the underside of the timber beam. Two SDS Heavy‑Duty Connector screws (provided with the kit) are to be installed through the WBP fastener holes and into the timber beam to support the weight of the bearing plate and rod above. This eliminates the need for an additional smaller bearing plate and nut on the top side of the beam. This unique connection also provides a fixed point at the very bottom of the rod run, allowing the take‑up devices above to address shrinkage of all the timber framing including any from the timber beam itself. The heavy hex nut provided with the WBP is required to fully engage the tensile capacity of the rod above.