Diaphragms With End Horizontal Offsets - The Analysis of Irregular Shaped Structures - page 155

Find:
1. Explain why the beam at grid line C from 1 to 2 plays a key part in the dia-
phragm.
2. Determine all the diaphragm shears. What is the maximum shear and where
does it occur?
3. Determine all chord, strut, and collector forces. ▲
Problem 3.4: Double Notch Diaphragm, Analysis in the Transverse Direction (See
Fig. P3.4)
Given: The diaphragm shown has a length of 140 ft and a depth of 50 ft. The diaphragm
has two offsets at the left support, a 15 ft offset between grid lines B and C, and a 10 ft
offset between grid lines C and D. Both of these offsets cause discontinuities in the
diaphragm chords. A uniform load of 200 plf is applied to the diaphragm in the trans-
verse direction. Two transfer diaphragms, TD1 and TD2, are required to distribute the
disrupted chord forces out to the main diaphragm chords. Transfer diaphragm TD1
supports the chord at grid line B, and transfer diaphragm TD2 supports the chord at
grid line C.
F i g u r e P3.4
Find:
1. Determine all the diaphragm shears.
2. Determine all chord, strut, and collector forces. ▲