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RE: shear values for screws in metal stud

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The values in the UBC and IBC for plywood shearwalls on metal studs and the size of screws and gauge of steel is based on cyclic testing. I have not kept up with this in the last few years but as a previous member of LGSEA I followed the work done to evaluate plywood shearwalls. In fact, the capacity of the shearwalls was reduced over previously published APA static testing because the shear capacity was due to the failure of the screw in shear rather than buckling of the metal stud. The stiffer the stud, the lower the capacity of shear before the screw failed in shear. Therefore, the balance was to decrease the allowable shear capacity as noted in the code while increasing the recommended gauge of the steel studs (reducing its thickness) to allow for more flexibility and greater resistance to shear failure.

I would agree with Ted on this one – your best bet is to contact LGSEA to obtain the published test data on shearwalls and not simply change the gauge of stud, thickness or screw or even the thickness of the sheathing – it is the system that was tested not each individual component.

 

Regards,

Dennis S. Wish, PE

California Professional Engineer

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-----Original Message-----
From: TED RYAN [mailto:tryan(--nospam--at)pcsainc.com]
Sent: Friday, December 10, 2004 11:55 AM
To:
seaint(--nospam--at)seaint.org
Cc: michael.laplante(--nospam--at)cima.ca
Subject: RE: shear values for screws in metal stud

 

Keep in mind that the values out of the tables in the IBC need to be reduced as appropriate per the text.

 

Ted Ryan

 

-----Original Message-----
From: TED RYAN
Sent: Friday, December 10, 2004 11:51 AM
To: seaint(--nospam--at)seaint.org
Cc: michael.laplante(--nospam--at)cima.ca
Subject: RE: shear values for screws in metal stud

 

IBC 2211 deals with cold formed steel light-framed shear walls and contains a table similar to that of wood.  Additionally, you can purchase all kinds of literature about the subject from the Light Gauge Steel Engineers Association.

 

Ted Ryan

 

-----Original Message-----
From: Michael Laplante [mailto:michael.laplante(--nospam--at)cima.ca]
Sent: Friday, December 10, 2004 11:41 AM
To: SEAINT(--nospam--at)SEAINT.ORG
Subject: shear values for screws in metal stud

 

List:

 

I am trying to make a 5/8 plywood sheating attached to metal studs work as a shearwall and roof deck.   Where can I find shear values for the fasteners  (spacing and type. )  based on the gauge of the base material.      Any help would be great. 

 

Thanks and a good weekend to all. 

 

Mike