Diaphragms With Vertical Offsets - The Analysis of Irregular Shaped Structures - page 241

F i g u r e 7.9 Delected shape.

Deflection is likely to control most of the design of the diaphragm and components. The
total deflection along grid line 3, ∆ max3 , shown in Figs. 7.9 and 7.10 is equal to the shear
deflection, chord slip, and nail slip contribution of the open front diaphragm plus the deflec-
tion of SW1 plus the deflection caused by the rotation of the diaphragm, plus the deflection
of the clerestory shear walls and their rotation caused by the flexible supporting beam under
bending. The APA noted in a publication describing the method of designing an open front
diaphragm that the bending deflection of the diaphragm was equal to zero because the
chords were not restrained from bending. The chord slip was also noted to be zero. How-
ever, if full-length walls are not installed at grid lines A and B from 1 to 3, the boundary
members along those lines act as struts and the slip in the boundary members due to
drag forces must be added. The shear wall deflection at grid line 1 is determined by

8 vh

EAb

3

vh
G

hd
b

IBC Eq. 23-2

∆= ++

075 . he +

a

SW1 n

t