Connection Guide : Joist Connections

Disclaimer: This guide is not comprehensive. It shows only a few of the many joist connections that connection design can create.

Joist connections
Top chord to beam flange Stiffened angle, top chord Joist top chord to concrete with pocket & bearing plate
Plate seat for the top chord W tee seat for top chord Top chord joist seat to an embed plate
Top chord seat, sloping Stability angle for bottom chord extension Extended joist bottom chord stabilizer to an embed plate
Angle seat for the top chord Stability plate for bottom chord extension

Also see :

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Joist Top Chord Bolted to a Beam Flange
Input connection type: ' Bearing '

Settings: ' Bolted ' top chord to support. " NM bolt diameter " sets the hole size. " Gage " comes from the local shape file .
Comments: The " Input elevation " of the joist must be the beam's top flange elevation.

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Plate Seat for the Top Chord of a Joist
Connection Design Locks = " Seated Plate "
Input connection type: ' Seated joist '.
Settings: ' Plate ' material. " Gage " comes from the local shape file . " NM bolt diameter " sets the hole size. Seat is " Bearing depth " below the workline of the joist.
Comments: The seat is a built-up tee made of welded plates.

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Plate Seat for the Top Chord of a Sloping Joist
Connection Design Locks = " Seated Plate "
Input connection type: ' Seated joist '

Settings: ' Plate ' seat material. " Gage " comes from the local shape file . " NM bolt diameter " sets the hole size. Seat is " Bearing depth " distance below the workline of the joist.

Comments: Unlike plate seats for beams, the supporting surface of a plate seat for a sloping joist is flat.

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Angle Seat for the Top Chord of a Joist
Connection Design Locks = " Seated Angle "
Input connection type: ' Seated joist '.
Settings: ' Unstiffened L ' seat material. " Gage " comes from the local shape file . " NM bolt diameter " sets the hole size. Seat is " Bearing depth " distance below the workline of the joist.
Comments: Angles must be listed in Home > Project Settings > Fabricator > Standard Fabricator Connections > Preferred Angle Sizes , or connection design will instead create a seat made of plate material.

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Stiffened Angle Seat for a Joist Top Chord
Connection Design Locks = " Seated Angle "
Input connection type: ' Seated joist '.
Settings: ' Unstiffened L ' seat material. " NM bolt diameter " sets hole diameter. " Gage " and " Bearing depth " come from local shape file .
Comments: Angles must be listed in Home > Project Settings > Fabricator > Standard Fabricator Connections > Preferred Angle Sizes .

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W Tee Seat for a Joist Top Chord
Connection Design Locks = " Seated Tee "
Input connection type: ' Seated joist '.
Settings: ' Tees ' seat material, " NM bolt diameter " sets hole diameter. " Gage " and " Bearing depth " come from local shape file .
Tee sections must be listed in Home > Project Settings > Fabricator > Standard Fabricator Connections > Preferred WT Sizes . If connection design cannot find an appropriate tee in the setup list, a seat made of plate material is designed.

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Stability Angle for a Joist's Bottom Chord Extension
Connection Design Locks = " Joist Stabilizer Angle "

Settings: " Extend bottom chord " (checked) ' Angle ' stabilizing material.

Comments: Connection design initially uses the Home > Project Settings > Fabricator > Standard Fabricator Connections > Joist Connection Settings > " Bottom chord extension seat angle ."

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Stability Plate for a Joist's Bottom Chord Extension
Connection Design Locks = " Joist Stabilizer Plate "
Settings: " Extend bottom chord " (checked), ' Plate ' stabilizing material.
 
Comments: Connection design initially uses the Home > Project Settings > Fabricator > Standard Fabricator Connections > Joist Connection Settings > " Bottom chord extension plate ."

Per an OSHA standard, the bottom chord stability plate should include an erection hole. Under " Connection specifications " on the Joist Edit window, " Use erection hole " lets you eliminate the hole along with the " Erection hole diameter " lock that would otherwise be found in the " Joist Stabilizer Plate " leaf.

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Joist Top Chord to Concrete Wall with Pocket & Bearing Embed
Connection Design Locks = " Joist End Pocket "
(embeds are custom members, not system connections)
Input connection type: ' Bearing ' or ' Auto standard ' or ' User defined '.
Settings: " Schedule entry " (top chord)
Comments: The joist frames to a concrete wall (or tilt-up panel if you have a concrete license ). The " Pocket grout thickness " in this example is ' 0 ' (zero), a value which places the embed flush with the bottom of the shoe. The embed shown is a plate, but could have been an angle or channel.

Top Chord Joist Seat to an Embed Plate
Connection Design Locks = see plate seat or etc.
(embeds are custom members, not system connections)
Input connection type: ' Seated ' or ' Auto standard ' or ' User defined '.
Settings: The " Schedule entry " (top chord) may be a plate (shown) or angle or channel.
Comments: An embed created by a top chord " Schedule entry " is a custom member , not a system connection. The system connection in this example is the joist seat.

Extended Joist Bottom Chord to an Embed Plate
Connection Design Locks = see stabilizer or etc.
(embeds are custom members, not system connections)
Input connection type: Any except ' Plain end '.
Settings: " Schedule entry " (bottom chord). " Extend bottom chord " is checked and ' Plate ' or ' Angle ' is selected as the " Stabilizing material ."
Comments: The embed is, by default, positioned 1 inch above the stabilizer. You can change this " Support offset " on the Embed Plate window.

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