Group action factor (Cg)
How does the group action factor apply to connections? And does the group action factor, Cg, apply to sill plates and ledgers?
It does not apply to sill plates and ledgers. See the slides for more details.
Nominal lateral design values for split ring connectors, shear plate connectors, bolts with D less than or equal to 1", or lag screws in a row are multiplied by a group action factor per section 10.3.6 of the 2005 NDS.
An obvious application is the bottom chord tension splice of a heavy timber truss. It can be shown through shear-lag analysis that fasteners arrayed in this manner do not load up equally. The group action factor accounts for load redistribution that occurs in this type of joint.
The group action factor does not apply to sill plates or ledgers because such unit loads along the length of the member are not axial. See the slides for a more detailed explanation.
It does not apply to sill plates and ledgers. See the slides for more details.
Nominal lateral design values for split ring connectors, shear plate connectors, bolts with D less than or equal to 1", or lag screws in a row are multiplied by a group action factor per section 10.3.6 of the 2005 NDS.
An obvious application is the bottom chord tension splice of a heavy timber truss. It can be shown through shear-lag analysis that fasteners arrayed in this manner do not load up equally. The group action factor accounts for load redistribution that occurs in this type of joint.
The group action factor does not apply to sill plates or ledgers because such unit loads along the length of the member are not axial. See the slides for a more detailed explanation.
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