Civil Engineering Reference
In-Depth Information
Figure 16.17
1
2
depth of stem running from top of slab to bottom of stem) for interior beams and
times the stem
gross moment of inertia for edge beams.
I
for edge beams
13,476 in.
4
I
for interior beams
15,870 in.
4
(d)
Calculating
values (where
is the ratio of the stiffness of the beam section to the
stiffness of a width of slab bounded laterally by the centerline of the adjacent panel, if any, on each
side of the beam):
1
2
7.5
12
For edge beam (width
22
11.625 ft)
1
12
I
s
(12
11.625)(6)
3
2511 in.
4
13,476
2511
5.36
For 18-ft interior beam (with 22-ft slab width)
1
12
(12
22)(6)
3
4752 in.
4
I
s
15,870
4752
3.34
