Civil Engineering PE Reinforced Concrete Design 4

Question 1

A two-way flat plate has columns on a 20-ft × 20-ft grid. For punching shear, the critical perimeter bo around an interior column (18×18 in, d = 7 in) is:

Accepted Answer

116 in

Answer

100 in

Answer

72 in

Answer

140 in

Question 2

The ACI 318 standard hook development length ldh for a #6 bar (fy = 60 ksi, f'c = 4000 psi, normal weight concrete, no confinement) is approximately:

Accepted Answer

14 in

Answer

8 in

Answer

11 in

Answer

18 in

Question 3

For a spirally reinforced column, the minimum spiral reinforcement ratio ρs per ACI 318 is:

Accepted Answer

0.45(Ag/Ac - 1)(f'c/fyt)

Answer

0.25(Ag/Ac)(f'c/fyt)

Answer

0.12f'c/fyt

Answer

0.01(Ag/Ac)(fy/f'c)

Question 4

A simply supported beam (span = 24 ft) carries a uniform service dead load of 1.5 k/ft and live load of 2.0 k/ft. The maximum factored moment Mu using ACI load combinations is:

Accepted Answer

468 ft-kips

Answer

360 ft-kips

Answer

414 ft-kips

Answer

540 ft-kips

Question 5

The slenderness ratio klu/r below which slenderness effects may be neglected for a braced (non-sway) reinforced concrete column is:

Accepted Answer

34 − 12(M1/M2)

Answer

22

Answer

40

Answer

50

Question 6

In a beam-column joint, horizontal joint shear Vjh is resisted primarily by:

Accepted Answer

A diagonal concrete compression strut

Answer

Stirrups within the joint

Answer

Longitudinal reinforcement in the beam

Answer

The column spiral reinforcement

Question 7

For a reinforced concrete wall with hw/lw > 2.0, the critical section for flexural design is located at:

Accepted Answer

The base of the wall

Answer

Mid-height of the wall

Answer

lw/4 from the base

Answer

lw/2 from the base