LAG SCREWS

[dherna45]

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

 

[JAE]

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

Check out Eng-Tips Forum's Policies here:
faq731-376

 

[msquared48]

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

Mike McCann, PE, SE (WA)

 

[Ron]

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.