Combining Types of Shear
During our outing to the field you viewed several different types of shear walls. Let's review before we move on.
|The Typical Wall Framing
|From the basic forces...
|The Plywood Sheathed Wall
|The addition of sheathing, placement of hold-downs
posts completes the wall.
|The Straight Sheathed Wall
|The Cement Plaster (Stucco) Wall - Step One
|Note the different style of bolts according to purpose.
not stressed in previous diagrams, this is an important consideration
in shear wall design.
|The Cement Plaster (Stucco) Wall - Step Two
|By going a bit further with the description of forces
in shear walls we can
see why cement plaster - though a stronger material - has such a low Code
|The Cement Plaster (Stucco) Wall - Step Three
|Although strong, cement (and concrete) are brittle
materials that, for
the most part, lack the ability to resist tension forces. That is the
purpose for the embedded wire mesh.
Each of these walls has a different way of resisting lateral loads. Under similar loading they will all deflect differently. As a result, the combination of distinctly different lateral force-resisting walls along one wall line is not permitted. Walls in line must work together in similar ways to effectively resist lateral loads.