1.12. A short reinforced concrete column, 20in square, is reinforced with ten no.9 grade 60 bars and has a concrete strength of 4000 lbf/in2. What is (a) the design axial load capacity and (b) the required spacing of the lateral ties? a. 700kips;20in b. 1000kips; 18in c. 1020kips; 18in d. 1400kips; 20in

Structural Analysis
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Chapter2: Loads On Structures
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1.12. A short reinforced concrete column, 20in square, is reinforced with ten no.9 grade 60
bars and has a concrete strength of 4000 lbf/in2. What is (a) the design axial load capacity
and (b) the required spacing of the lateral ties?
a. 700kips;20in
b. 1000kips; 18in
c. 1020kips; 18in
d. 1400kips;20in
The following problem description is for
A reinforced concrete flat plate floor without beams has 18 in square columns at 20ft
centers in one direction and 24ft centers in the other direction, and it supports a factored
distributed load of 200 lbf/ft2.
Design assumptions
O
o afi = afz = β = 0
O
Consider moments in the direction of the shorter span only.
af₁²7/² = 0
ACI Sec. 8.10.2 is applicable.
O
1.13. The column strip moment at the end bay span is most nearly
a. 35 ft-kips
b. 40 ft-kips
c. 65 ft-kips
d. 110 ft-kips
1.14. The column strip moment at the interior support of the end bay is most nearly
a. 35 ft-kips
b. 40 ft-kips
c. 65 ft-kips
d. 110 ft-kips
1.15. The column strip moment in an interior bay span is most nearly
a. 35 ft-kips
b. 40 ft-kips
c. 65 ft-kips
d. 110 ft-kips
Transcribed Image Text:1.12. A short reinforced concrete column, 20in square, is reinforced with ten no.9 grade 60 bars and has a concrete strength of 4000 lbf/in2. What is (a) the design axial load capacity and (b) the required spacing of the lateral ties? a. 700kips;20in b. 1000kips; 18in c. 1020kips; 18in d. 1400kips;20in The following problem description is for A reinforced concrete flat plate floor without beams has 18 in square columns at 20ft centers in one direction and 24ft centers in the other direction, and it supports a factored distributed load of 200 lbf/ft2. Design assumptions O o afi = afz = β = 0 O Consider moments in the direction of the shorter span only. af₁²7/² = 0 ACI Sec. 8.10.2 is applicable. O 1.13. The column strip moment at the end bay span is most nearly a. 35 ft-kips b. 40 ft-kips c. 65 ft-kips d. 110 ft-kips 1.14. The column strip moment at the interior support of the end bay is most nearly a. 35 ft-kips b. 40 ft-kips c. 65 ft-kips d. 110 ft-kips 1.15. The column strip moment in an interior bay span is most nearly a. 35 ft-kips b. 40 ft-kips c. 65 ft-kips d. 110 ft-kips
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