Slide 17 of 67
Shear Walls Are Like Wood I-Beams
- The figure demonstrates this point
- Wood structural panel shear walls behave like cantilevered wood I-beams.
- Just as wood I-beams use their flanges to resist bending, wood structural panel shear walls use their end studs.
- Both wood I-beams and wood structural panel shear walls use their sheathing web to resist shear forces.
- Because of their size, wood structural panel shear walls must fasten their sheathing to intermediate wall studs to prevent it from buckling.
- The stiffness of shear walls constructed with wood structural panels depends on four things:
- The size and species grade of the end studs (e.g., better grade lumber will resist more bending forces)
- The thickness and grade of the sheathing (e.g., structural 1 is 2 times as rigid as structural 2)
- The diameter of the sheathing fasteners (e.g., bigger the shank of the nail, the less the plywood slides)
- The amount of slip in any hold-down device
- We will discuss each of these four components of stiffness in more detail