Diaphragms With End Horizontal Offsets - The Analysis of Irregular Shaped Structures - page 152

Problem 3.1: Single Notched Diaphragm, Analysis in the Longitudinal Direction, Strut
Offset Outward (See Fig. P3.1).
Given: The diaphragm is 125 ft long with a 50 ft depth. There is a 15 ft offset between grid
lines B and C. The plan shows that shear walls are located at grid lines A and B only. The
edge of the diaphragm at grid line C is supported by a strut that is tied into the end of the
propped cantilever transfer diaphragm that occurs between grid lines 2 and 3. The strut
at grid line C is offset outward from grid line B, which creates a discontinuity in the strut.
The diaphragm is loaded in the longitudinal direction with a 200 plf uniform load.
F i g u r e P3.1
Find:
1. Determine all the diaphragm shears.
2. Determine all chord, strut, and collector forces. ▲
Problem 3.2: Single Notched Diaphragm, Analysis in the Transverse Direction,
Collector Past the Centerline of the Diaphragm (See Fig. P3.2)
Given: The structure shown in the isometric drawing and plan view drawings is 160 ft
long with a 60 ft depth. A pop-up roof section occurs between grid lines 1 and 2 from B
to C. The roof sheathing has been omitted at the plane of the main roof diaphragm at