Diaphragms With Vertical Offsets - The Analysis of Irregular Shaped Structures - page 236

F i g u r e 7.4 Simple diaphragm supported off of open front diaphragm.

line 3. The displaced shapes of the two sections are shown in the figure. The diaphragm
reactions and moment applied to section 1 by section 2 are

wL ( )

RVR ===

234
2

−

reactionsofsimplespandiaphragm

3 3 4

RVwL
1

=+ ( ) reaction of open frontdiaphragm at grid line1

3 113 −

wL ( )

2

113 −

MVL = ( ) + diaphragmmomentatgrid line1

1 3 13 −

2

Shear transfer across the vertical offset can be complicated. Architectural constraints
often limit what can be done to the clerestory wall. Configurations 1 and 2 of Fig. 7.5
show two possible methods for transferring the shears when full-height shear walls
cannot be installed from the foundation to the upper roof diaphragm. In configuration 1,
short wood-sheathed shear panels or shear walls are used. The panels (discontinuous
shear walls) are supported by glu-lam beams or steel beams below. Interior columns
can be installed to reduce the beam spans, which will provide additional stiffness to the