Diaphragm Basics - The Analysis of Irregular Shaped Structures - page 44

F i g u r e 2.18 Collector and shear wall transfer issues.
fasteners on the chord member were not addressed. Secondary bending in the bottom
chord due to wall rotation and the effects of an interior support was also not addressed.
The truss was designed as a simple span, ignoring the fact that the truss went into bear-
ing at the shear wall. The integrity of the bottom chord of the truss and the functionality
of the design were highly questionable. In addition, no inspections were made of the
installation or the connections. In consideration of the importance of the lateral-force-
resisting system, it is necessary to ensure coordination of all the components including
those designed and provided by others such as preengineered trusses. This example
illustrates that there were several different members and connections that are suscep-
tible to failure which could prevent the loads being transferred into the wall. Other
details in Fig. 2.16 show conditions where shear transfer must be made through the top
chord of the truss. In these cases, care must be taken in selecting the proper tie strap that
has a reasonable nail spacing that will avoid splitting the truss chord member. For the
gang-nail truss, the strap nailing and gang-nail plate occur at the same location, which
causes high-density nailing, splitting, and disturbance of the gang-nail connection.