Civil Engineering Reference
In-Depth Information
PROBLEMS
18.1
Design a reinforced concrete bearing wall using the
ACI empirical formula to support a set of precast concrete
roof beams 6
c
18.3
Design the reinforced concrete wall shown if
4000 psi and
f
y
60,000 psi. (
One ans.
10 in. wall with 8
#9 flexural bars each end)
f
on center, as shown in the accompanying
illustration. The bearing width of each beam is 8
0
. The wall
is considered to be laterally restrained top and bottom and
is further assumed to be restrained against rotation at the
footing. Neglect wall weight. Other data:
c
f
3000 psi,
f
y
60,000 psi, beam reaction,
D
35 k,
L
25 k. (
Ans.
7
2
in. wall with 3 @ 12 vertical steel).
18.2
Repeat Problem 18.1 if the wall is not restrained
against rotation at top or bottom, is 8
0
in height, and has
c
18.4
Repeat Problem 18.3 if
h
w
15
0
and if
f
c
an
f
4000 psi.
3000 psi.
Problem in SI Units
18.5
Design a reinforced concrete bearing wall using
the ACI empirical formula to support a set of precast
roof beams 2 m on center, as shown in the accompany-
ing illustration. The bearing width of each beam is 200
mm. The wall is considered to be laterally restrained
top and bottom and is further assumed to be restrained
against rotation at the footing. Neglect wall weight.
Other data:
21 MPa,
f
y
420 MPa, beam reaction
D
120 kN,
L
100 kN. (
Ans.
160 mm thick wall
with #10 bars @ 200 mm o.c. horizontal reinforcing)
beams 2m o.c.
4m
c
footing
f
