System Design
Tie-Down System Design
Tie-Down Systems are required to properly attach buildings to their foundations.
They are designed for either seismic restraint of shear walls or high wind uplift.
Tie-down system design requires:
1. A specification for the required system strength, elongation, shrinkage, code references.
2. Tables that list the load requirements, floor heights, elongations, run start points etc. for a particular job.
3. A parts catalog listing component: strength capacities, elongation information and shrinkage information that allows the designer to select the proper components to meet job specified requirements.
Using the specifications, load tables and listed parts, tie-down systems are designed and detailed that meet engineering and code requirements for each specified building.
Per the 2021 SDPWS, all stated system elongations are included in Tie-Down systems.
Δa = vertical deformation of the wall overturning anchorage system (including but not limited to fastener slip, device elongation, rod elongation and uncompensated shrinkage) plus the vertical compression deformation, the effect of which are measured at the ends of the shear wall and associated with the unit shear force induced by the design load in the shear wall, in”.¹
Designs may include: run locators, detail drawings and/or calculations as required.
¹SDPWS 2021, American Wood Council, 222 Catoctin Circle SE, Suite 201, Leesburg, VA 20175. www.awc.org, pg. 32.
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