Diaphragms With Intermediate Offsets - The Analysis of Irregular Shaped Structures - page 162

F i g u r e 4.1 Intermediate notch, offset left, analysis in the transverse direction.

is supported at the main diaphragm chord locations at grid lines A and C. Each transfer
diaphragm has a length of 50 ft and a depth of 15 ft. The aspect ratio of the transfer
diaphragm is 3.33 : 1, which requires it to be blocked, in accordance with NAF&PA
SDPWS 1 Table 4.2.4. Transverse collectors are placed along the entire depth of the
main diaphragm at grid lines 1, 2, 3, and 4 to act as chord members for the transfer
diaphragm. The sign convention for the diaphragm sheathing elements is shown at
the lower right of the figure.
Construction of the basic shear diagram: Shear values are required at all collector locations;
see Fig. 4.1.

RR wL
1

200 150
2

( )

== = = 15 000 , lb , reaction at supportingwalls

5

2

R
D

15 000
50

,

v ==

1

= 300 plfunitshear at grid line1

1