plywood shear walls
plywood shear walls
(OP)
Attached is a sketch of a simple wood frame building with a copuple of simple questions (my brain stalled) Also how do I calculate the shear in the roof diaphragm?
When was the last time you drove down the highway without seeing a commercial truck hauling goods?
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RE: plywood shear walls
RE: plywood shear walls
RE: plywood shear walls
2. Calculate the reaction at the end of the diaphragm (lbs). This is equal to the load found above times 1/2 of the diaphragm length.
3. Find the shear (plf) in the diaphgragm. This is equal to the reaction found above divided by the depth of the diaphragm.
DaveAtkins
RE: plywood shear walls
That would give us the max shear in the in the end shear wall and the max shear in the roof diaphragm ...... where the roof is flat. Do we not want the shear in the roof diaphragm parallel with the rafter?
RE: plywood shear walls
This is true only if the length of the shear wall is equal to the depth of the diaphragm. If there are any openings in the shearwall or sections where it does not exist, then the load per foot in the shear wall will be proportionately higher than the diaphragm.
"Do we not want the shear in the roof diaphragm parallel with the rafter?"
Shear can go in any direction, but we normally analyze two for simplicity, and they are usually perpendicular to one another. The rafters will see both parallel and normal shear forces, but at different times.
Mike McCann
MMC Engineering
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RE: plywood shear walls
Sidewall pressures and internal pressures won't cause racking. It is analysed like a balloon with uniform pressures on each face. The walls are subject to pressures but the global force on the building is zero.
Are you concerned with the shear stress in the diaphragm in addition to the tensile stress caused from side wall pressures?
RE: plywood shear walls