Question

The floor system for a reinforced concrete building consists of a continuous one way slab built monolithically with its supporting beams as shown. Given f’c = 4 ksi and Grade 60 steel.

16'-0" End span 16'-0 Typical interior span 26" 18" 18" 18"

(a) Assuming wu = 2 k/ft, the maximum negative moment using ACI (8.3.3) coefficients is most nearly:

A 51.2 k-ft/ft

B 42 k-ft

C 64 k-ft

D 46.5 k-ft

E Other (specify)

(b) The steel required to resist a moment of 50 k-ft for an effective depth = 8 in. is most nearly:

A 1.44 in2

B 1.59 in2

C 1.63 in2

D 1.65 in2

E 1.60 in2

(c) The minimum slab depth is most nearly:

A. 8.0 in.

B. 7.3 in.

C. 10.4 in.

D. 9.6 in.

(d) The maximum spacing of #4 shrinkage and temperature steel assuming h = 6 in. is most nearly:

A. 12 in.

B. 18 in.

C. 24 in.

D. 30 in.

E. Other (specify)

(e) The maximum service live load the slab can support assuming Mu = 50 k-ft and h = 6 in. is most nearly:

A. 0.9 ksf

B. 1.4 ksf

C. 1.6 ksf

D. 1.8 ksf

E. 1.1 ksf

(f) The steel corresponding to the maximum (absolute value) moment is located:

A. at the bottom

B. at the bottom below the shrinkage and temperature steel

C. at the bottom above the shrinkage and temperature steel

D. at the top below the shrinkage and temperature steel

E. at the top above the shrinkage and temperature steel

Answer 1

Ques 1 a

Ques 2 b

Ques 3 a

Ques 4 a

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