Standard Shear Walls - The Analysis of Irregular Shaped Structures - page 358

are also installed between the webs in the plane of the trusses at the panel locations.
Nailing is installed into the blocking full depth of the vertical members with 16d side
grain nails. The vertical shear forces F 2 at the interior trusses are resisted by these nails.
The transfer of the vertical forces into the trusses will allow one to use the dead load of
the trusses to resist overturning of the shear panels. The dead load of the truss or
absence of a truss at the outside edge of the end panel may not be sufficient to resist the
overturning force at that location. In this case, a tie strap must be installed as required
by calculation.
Capacity vs. demand, typical detail 3 (see Fig. 9.22):

Capacity of 16d side-grain nails at 6” o.c. = (8 nails)(141)(1.6) = 1804.8 lb > 1720 lb

Therefore the detail connection is OK.

141 16 12
430

(.)( )

Nail spacingtoshear wall = = 6 .3 ′′ o.c. use 16d @6 o.c ′′ .

= 74 116 12
430

( .)()

Nail roof shtg to shearpanelsorblocking .

= 33 . ′′ o.c. use8d@3o.c ′′ .

where
Z = 74 lb, NDS Table 11Q with G = 0.5
15/32” plywood sheathing
C D = 1.6

In addition to the panels, a collector that provides the remaining part of the dia-
phragm boundary is required to transfer the diaphragm forces through the panels and
into the shear wall. Whenever the trusses are continuous over the wall, an alternate
approach is required to create the collector. Figures 9.23 through 9.25 show the possible
construction of a continuous collector projecting through open web trusses. The collec-
tor can consist of multiple continuous 2× members placed below the truss top chord.
The diaphragm shear is transferred into these members by solid blocking placed
between the truss top chords, as shown in section A. The multiple 2× member joints are
spliced by a lapped and nailed connection or with a steel strap splice connection. The
multiple members are nailed together to act as a single composite member to form the
collector. Far too often, collectors and drag struts are designed for tension forces only.
The collector must be designed to resist both tension and compression forces. The top
member of the multiple collector elements should be nailed to the truss top chords at
each truss crossing and into the blocking to help transfer the shear. This allows a side
grain nailing condition instead of toe-nailing. These connections allow the truss chords
to brace the collector element in both directions, which eliminates buckling issues.
Additional shear clips can be added to the blocking as required. Special nailing of the
sheathing along the strut or collector line should be called out on the drawings. The
forces applied to the blocking between the truss top chords act in the same manner as
the shear panels (i.e., the eccentric lateral forces produce opposing vertical forces to
maintain static equilibrium). Connection of the blocking to the truss top chords requires
fasteners to resist these vertical forces. The connection of the strut or collector to the