Diaphragm Basics - The Analysis of Irregular Shaped Structures - page 36

F i g u r e 2.10 Shear transfer into boundary elements.
will occur at the inside corner of the building. A truss, beam, or girder commonly occurs
at this location, which can conveniently serve as the required collector if properly
designed. Installing the collector and making a connection to SW3 eliminate the tearing
problem and provide a complete load path along grid line 2. Diaphragms 1 and 2 are
then created as shown, which function the same as the two-span diaphragm previously
discussed. The issues and solutions are the same for loading in the longitudinal direc-
tion. A collector is required to be installed along grid line B from 1 to 2 to prevent tear-
ing at the inside reentrant corner. All boundary edges of each diaphragm are supported
as shown and as required by code.
The diaphragm shown in Fig. 2.12 is a single simple span diaphragm when loaded
in the transverse direction. It is considered a cantilever diaphragm when loaded in the
longitudinal direction, which is shown in Fig. 2.13. For loading in the transverse direc-
tion, Fig. 2.12 shows a collector placed along grid line B and diaphragm chords located
at grid lines A and C. The end walls along grid lines 1 and 2 consist of partial-length