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LAG SCREWS

LAG SCREWS

(OP)
The Lag screws lateral strength on chapter 11 of the NDS from a side plate to a main member say to be based on a penetration of 8D. Does anyone knows how the strength increases if a penetration depth of 16D is used instead.
Thanks

RE: LAG SCREWS

Not totally sure but I don't think you get an increase in lateral strength from going beyond the minimum required penetration.

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RE: LAG SCREWS

8d may be all that is needed to develop the shear strength of the screw.

Mike McCann, PE, SE (WA)


RE: LAG SCREWS

Shear does not increase with depth, once fixity is achieved. As Mike notes, when you get to a point (8d is reasonable), then there is no further increase.

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