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Holdown Selector

Holdown connectors are typically used to anchor shearwall segments against overturning. This Holdown Selector is a quick and easy tool that selects the most cost effective holdown connector based on the type of installation, factored load and the species of the post. Holdown selection as well as associated anchorage design for the US has migrated to the Post-to-Foundation Designer.

Version 3.1

Holdown Selector Video Tutorial

Select your country

Select holdown installation method

Cast-in-Place

Select this if the holdown connector is to be installed prior of placement of concrete.

Post Installed

Select this if the holdown connector is to be installed after placement of concrete.

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Cast-In-Place Input Information

Factored Uplift Load

Enter LSD holdown overturning tension force.

Units

Design Category

Select the appropriate design category for the site based on the governing load combinations per Part 4 NBCC 2010.

Over Sheathing?

Select "Yes" if the connector will be installed on top of wall sheathing or "No" for directly to the end post.

Post Type

Select post type values are based on the maximum sill plate thickness is 1 1/2 inches. For thicker sill plates the STHDRJ or LSTHDRJ may be used with the same reductions as the STHD.

Post Species

Select the species of the post to which the holdown connector will be installed.

Stemwall Thickness

Select the applicable width of the foundation beam or footing into which the connector will be embedded. Use 8" for widths 8" or larger.

Cracked?

Select "Yes" if the cast-in-place connector is located in a region of a concrete member where analysis indicates cracking at service load levels.

Location

Select the location of the holdown connector with respect to the edges of the foundation.

Rim Joist Installation?

Select "yes" if the Shearwall is located on a wood floor system.

Calculation Results

Holdown Selector
(Canadian)

Cast-In-Place Possible solutions

The factored load exceeds the maximum factored resistance for this type of holdown. Please contact Simpson Strong-Tie for alternative solutions.

Model This indicates a holdown model that meets the specified design criteria.	Factored Uplift Resistance This is the maximum factored load that each connection has been evaluated to resist.	Deflection at Factored Uplift Load This is the vertical displacement of the holdown connection at the factored resistance. This value may be reduced linearly for lesser loads including specified wind loads at h/500. This value is used to calculate shearwall deflection per 9.7 CSA 086-09.	Minimum Post Thickness This is the minimum end post dimension perpendicular to the face to which the connector is installed.	Required Fasteners This indicates the number and type of fasteners used to connect the holdown connector to the end post.
No Solution	No Solution	No Solution	No Solution	No Solution

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Post Installed Input Information

Factored Uplift Load

Enter LSD holdown overturning tension force.

Units

Wood Species

Select the species of the post to which the holdown connector will be installed.

Calculation Results

Holdown Selector
(Canadian)

Post Installed Holdown Solutions

The factored load exceeds the maximum factored resistance for this type of holdown. Please contact Simpson Strong-Tie for alternative solutions.

Application This is the application method for installing the holdown connector. The list includes acceptable nailed, screwed, or bolted applications for the design criteria specified. If an application is not listed, then there are no solutions for that application.	Model This indicates a list of holdown models that meet the specified design criteria.	Factored Uplift Resistance This is the maximum factored load that each connection has been evaluated to resist.	Deflection at Factored Uplift Load This is the vertical displacement of the holdown connection at the factored resistance. This value may be reduced linearly for lesser loads including specified wind loads at h/500. This value is used to calculate shearwall deflection per 9.7 CSA 086-09.	Minimum Post Thickness This is the minimum end post dimension perpendicular to the face to which the connector is installed.	Anchor Bolt Diameter This indicates the diameter of the anchor used to anchor the holdown connector to the foundation. The anchor bolt embedment shall be determined by the design professional.	Required Fasteners This indicates the number and type of fasteners used to connect the holdown connector to the end post.	Installed Cost Index* The Installed Cost Index is used to compare the relative installed costs of similar connectors in order to identify which are the least expensive to install. The values are determined by combining the estimated cost of the connector, fasteners and labor for each installation and then presenting them in order from "lowest” cost to highest, showing the percentage of cost increase for each option.

Note:

Holdown and Tension Tie factored resistances are based on installation with an anchor rod length of 6" from the concrete to the top of the holdown seat. The products may be raised to any height with consideration of the increased deflection due to additional bolt elongation.

*The Installed Cost Index is used to compare the relative installed costs of similar connectors in order to identify which are the least expensive to install. The values are determined by combining the estimated cost of the connector, fasteners and labor for each installation and then presenting them in order from "lowest" cost to highest, showing the percentage of cost increase for each option.

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Missing Input

Holdown Selector

Select your country

Select holdown installation method

Cast-in-Place

Post Installed

Cast-In-Place Input Information

Calculation Results

Holdown Selector(Canadian)

Cast-In-Place Possible solutions

Post Installed Input Information

Calculation Results

Holdown Selector(Canadian)

Post Installed Holdown Solutions

Note:

Holdown Selector
(Canadian)

Holdown Selector
(Canadian)