Open Front and Cantilever Diaphragms - The Analysis of Irregular Shaped Structures - page 227

F i g u r e 6.14 Longitudinal force diagrams.
As demonstrated in previous examples, it is not always possible or desirable to provide
full-length collectors at grid line 2 if the framing is oriented in a direction perpendicular
to the shear wall. One possible solution is to install transfer diaphragms above and below
shear wall SW4, as shown in Fig. 6.15. The transfer diaphragms act as propped cantilever
beams, which are supported by the shear walls located at grid lines 1 and 2. Collectors
are installed off of each end of shear wall SW4 that embed the full depth of each transfer
diaphragm. Transverse collectors are also installed at grid lines B, C, D, and E, which act
as the transfer diaphragm chords. The diaphragm sections between grid lines A and B and
between grid lines E and F can be assumed to act as individual simple span diaphragms
that are supported at grid lines 1 and 3. The struts at grid line 3 transfer the reactions
of the diaphragm sections as concentrated loads to the ends of the transfer diaphragm