Situation 1 - Refer to the Figure shown. Prestressed hallow core slabs with typical section shown are a used for flooring of a library. Properties of the slab are as follows: A 14 x 105 mm²; St S = 6.8 x 106 mm³; a= 1.2 m; b = 200 mm. The slab is prestressed with 920 kN force at an eccentricity e = 63 mm below the neutral axis of the section. Slab weight is 2.7 kPa, superimposed DL = 2.0 kPa; 2.9 kPa. The slab is simply supported on a span of L = 8 m. Allowable stresses at service loads are 3.2 MPa in tension and 15.5 MPa in compression. Consider 20% loss of prestress at service loads. LL 31. Compute the maximum compressive stress (MPa) in the slab due to initial prestress force. A. 2.54 B. 12.6 C. 1.95 D. 15.1 32. Determine the maximum stress (MPa) at the bottom of the slab due to service loads and prestress force. B. 9.17 C C. 1.35 C D. 9.17 T A. 1.35 T 33. Determine the maximum additional load (kPa) including its own weight, that the slab can be subjected to if the allowable stresses at service loads are not to be exceeded. A. 3.86 B. 3.22 C. 4.12 D. 5.21
Situation 1 - Refer to the Figure shown. Prestressed hallow core slabs with typical section shown are a used for flooring of a library. Properties of the slab are as follows: A 14 x 105 mm²; St S = 6.8 x 106 mm³; a= 1.2 m; b = 200 mm. The slab is prestressed with 920 kN force at an eccentricity e = 63 mm below the neutral axis of the section. Slab weight is 2.7 kPa, superimposed DL = 2.0 kPa; 2.9 kPa. The slab is simply supported on a span of L = 8 m. Allowable stresses at service loads are 3.2 MPa in tension and 15.5 MPa in compression. Consider 20% loss of prestress at service loads. LL 31. Compute the maximum compressive stress (MPa) in the slab due to initial prestress force. A. 2.54 B. 12.6 C. 1.95 D. 15.1 32. Determine the maximum stress (MPa) at the bottom of the slab due to service loads and prestress force. B. 9.17 C C. 1.35 C D. 9.17 T A. 1.35 T 33. Determine the maximum additional load (kPa) including its own weight, that the slab can be subjected to if the allowable stresses at service loads are not to be exceeded. A. 3.86 B. 3.22 C. 4.12 D. 5.21
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
Related questions
Question
Prestressed
hallow core slabs with typical section shown are
used for flooring of a library. Properties of the slab are as follows: A = 14 x 105 mm?; S, = S, = 6.8 × 10€ mm?; a =
1.2 m; b = 200 mm. The slab is prestressed with 920 kN force
at an eccentricity e = 63 mm below the neutral axis of the
section. Slab weight is 2.7 kPa, superimposed DL = 2.0 kPa;
LL = 2.9 kPa. The slab is simply supported on a span of L =
8 m. Allowable stresses at service loads are 3.2 MPa in tension and 15.5 MPa in compression. Consider 20% loss of prestress at service loads.
1. Compute the maximum compressive stress (MPa) in the slab due to initial prestress force.
A. 2.54
B. 12.6
C. 1.95
D. 15.1
2. Determine the maximum stress (MPa) at the bottom of the slab due to service loads and prestress force.
A. 1.35 T
В. 9.17 C
c. 1.35 C
D. 9.171
3. Determine the maximum additional load (kPa) including its own weight, that the slab can be subjected to if the allowable stresses at service loads are not to be exceeded
A. 3.86
B. 3.22
C. 4.12
D. 5.21
Transcribed Image Text:Situation 1 - Refer to
the Figure shown.
Prestressed
hallow core slabs
with typical
section shown are
a
used for flooring of a library. Properties of the slab are as
follows: A 14 x 105 mm²; St S = 6.8 x 106 mm³; a=
1.2 m; b = 200 mm. The slab is prestressed with 920 kN force
at an eccentricity e = 63 mm below the neutral axis of the
section. Slab weight is 2.7 kPa, superimposed DL = 2.0 kPa;
2.9 kPa. The slab is simply supported on a span of L =
8 m. Allowable stresses at service loads are 3.2 MPa in tension
and 15.5 MPa in compression. Consider 20% loss of prestress
at service loads.
LL
31. Compute the maximum compressive stress (MPa) in the slab due
to initial prestress force.
A. 2.54
B. 12.6
C. 1.95
D. 15.1
32. Determine the maximum stress (MPa) at the bottom of the slab
due to service loads and prestress force.
B. 9.17 C
C. 1.35 C
D. 9.17 T
A. 1.35 T
33. Determine the maximum additional load (kPa) including its own
weight, that the slab can be subjected to if the allowable stresses
at service loads are not to be exceeded.
A. 3.86
B. 3.22
C. 4.12
D. 5.21
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