Rigid Moment-Resisting Frame Walls: The Frame Method of Analysis - The Analysis of Irregular Shaped Structures - page 503

F i g u r e 14.11 Tension and compression issues.

force applied to the frame in both directions. The largest resulting tie strap force should
be used. The tension force is transferred into the blocking that extends the full width of
the pier. The connection of the sheathing to the blocking must develop the maximum
flange plus axial force applied at the strap location. The tension force from the moment
at the joint is equal to

M
d

jnt

T = tensionstrap force, lb

strap

where d = center-to-center distance of top plate and blocking, in

M jnt = maximum moment at inside face of pier, in-lb

Bearing Stresses (See Fig. 14.11)
The bearing perpendicular to the grain stresses must also be checked when the bot-
tom flange of the header section is in compression. The compression force in the
bottom flange of the built-up header section bears against the vertical studs and
transfers its force through the studs into the multiple blocking members on the
opposite side that resists this force. The bearing stresses in the flange and blocking
must be checked. All flanges and blocking must be in full bearing against the verti-
cal studs. Special detailing on the drawings and field inspection of the framed wall
must be provided to ensure that this happens. The horizontal blocking shown in the
figure also acts as a bearing stiffener to prevent local buckling of the sheathing at
the joint. Nailing of the sheathing to the blocking should develop the full force in
the blocking.