Civil Engineering Reference
In-Depth Information
Figure 19.14
Continuous beams.
To provide additional safety for partially prestressed beams, it is common practice to
add some conventional reinforcement. This reinforcement will increase the ultimate flex-
ural strength of the members as well as help to carry the tensile stresses in the beam.
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PROBLEMS
19.1
The beam shown in the accompanying illustration has an effective total prestress of 240 k. Calculate the fiber
stresses in the top and bottom of the beam at the ends and
L
. The tendons are assumed to be straight. (
Ans. f
top
1.024 ksi,
f
bott
0.118 ksi at the
L
.)
3 k/ft (including beam weight)
25"
28"
28'
3"
15"
5
Lin, T. Y., and Burns, N. H., 1981,
Design of Prestressed Concrete Structures
, 3rd ed. (New York: John Wiley
& Sons), pp. 325-344.
