Lion06
Structural
- Nov 17, 2006
- 4,238
I have two questions about wood diphragms that I would like to get some opinions on.
I have not had a formal wood design class, but have done some wood design and read a lot from Breyer's "Design of Wood Structures ASD/LRFD".
The first question is regarding the diaphragm attachment to the joists. The tables in IBC all give nailing requirements. If you wanted to use screws to decrease the likelihood of squeaky floors down the road, is it simply a matter of making sure the screw shear meets or exceeds the nail shear or do you have to consider other things (such as ductility of the fasteners)?
The second question is regarding the chord members. Breyer's book says that the chord members are designed for teh axial forces resulting from the moment in the diaphragm. This makes sense, however, would you consider teh deflection of the diaphragm couled with the axial compression to design for the axial compression and a resulting moment equal to the compression times the deflection of the diaphragm? I know the deflection may be small, it seems like this should be accounted for, after all you don't have that axial compression without the deflection of the diaphragm.
I have not had a formal wood design class, but have done some wood design and read a lot from Breyer's "Design of Wood Structures ASD/LRFD".
The first question is regarding the diaphragm attachment to the joists. The tables in IBC all give nailing requirements. If you wanted to use screws to decrease the likelihood of squeaky floors down the road, is it simply a matter of making sure the screw shear meets or exceeds the nail shear or do you have to consider other things (such as ductility of the fasteners)?
The second question is regarding the chord members. Breyer's book says that the chord members are designed for teh axial forces resulting from the moment in the diaphragm. This makes sense, however, would you consider teh deflection of the diaphragm couled with the axial compression to design for the axial compression and a resulting moment equal to the compression times the deflection of the diaphragm? I know the deflection may be small, it seems like this should be accounted for, after all you don't have that axial compression without the deflection of the diaphragm.
