Diaphragm Basics - The Analysis of Irregular Shaped Structures - page 54

F i g u r e 2.23 Strut force diagrams at grid line C.

Example 2.2: Strut Force Diagrams at Grid Line C (Fig. 2.23)
Using the Traditional Method : Using the same diaphragm as in Example 2.1, determine the
strut forces along grid line C. The loads are applied to the diaphragm in the longitudinal
direction.

w = 325 plf

325 30
2

() 4875

180

R = = 4875 lb v = = - 27 . 08 plf

c diaph

The diaphragm shears are negative.

R
L

4875
210

v =

c

= =+ 243 75 . lf

∑

sW

()

SW

Determine the net shears at the shear wall:

v =- =+ v v 243 75 . - 27 08 . = + 216 67 . plf

net SW iaph