Horizontally Offset Shear Walls - The Analysis of Irregular Shaped Structures - page 445

F i g u r e 12.6 Roof transfer diagram shears.

line 2D must be calculated. An initial analysis will show that the transverse collector
force diagrams will not close because the actual force to the offset wall line is greater
than that calculated by using the standard tributary width method. The increase in
the reaction to the offset walls is approximately 5.6 percent, by trial and error. The
diaphragm shears will remain the same, but the load to the walls will increase by
this amount.
Force to transfer diaphragm (adjusted) (see Figs. 12.4 and 12.6):

wL 123 124

2

( ) (.

R =

14
2

−

( calculated increase ) = 105 6 ) = 8026 5 . lb

12 ,

R
L

8026 5
32

. 12 ,

v = = = 250 82 . plfunitwallshe ar = v

SW 1 SW 2

SW 1

V SW = 250 82 24 . () = 6020 lb totalshear to SW 1

1

v diaph =+59 45 . plf

v

= v − v = 250 82 . − 59 45 . = 191 36 . plf

net SWdiaph 1

V SW = 250 82 8 . () = 2006 5 . lb

2

v diaph =+ 67.52 plf

v = v − v = 250 82 . − 67 52 . = 183 29 . plf

net SW1 diaph