Diaphragms With Intermediate Offsets - The Analysis of Irregular Shaped Structures - page 172

F i g u r e 4.7 Intermediate notch, analysis in the longitudinal direction, offset discontinuous strut
(seismic).

of section B is assumed to be supported by transfer diaphragms TD1 and TD2 at grid
line B. It is reasonable to assume that the left reaction of section B is equally distributed
into both transfer diaphragms.
Load distribution into the diaphragm: The loads applied to the diaphragm, in this case, are
caused by seismic forces. Assume that the total lateral seismic load (plf) to the diaphragm
between grid lines A and B is 200 plf. The loads are distributed into each section in
proportion to its depth, as shown in Fig. 4.7.

wD
D

200 15
150

()

section
total

w = = = 20 plf Ato B

12 -

200 20
150

()

w 23 = = 26 67 . lf AtoB

-

200 115
150

( )

w 35 = = 153 33 . lf AtoB

-

w 12 = 20 plf Bto Cbyinspection

-

w 35 = 153 33 . lf BtoC

-