A)Prestressed Concrete HW(IBC-318)

When is periodic inspection allowed for a special inspector on a job-site ? (prestressed)

• During placing of REINFORCING STEEL & TENDONS

• never

• beginning of the project

• after placing of reinforcing steel & tendons

Answer explanation

IBC

Table 1705.3 # 1

The spacing of prestressing tendons used for shrinkage REINFORCEMENT shall not be farther than _____ to the nearest wall or face of beam ?

• 6^ft

• 8'

• 4'

• 3'

Answer explanation

ACI 318

7.7.6.3.1

What is the maximum % of total prestress loss that can occur due to un-replaced broken strands?

• 2 %

• 5 percent

• 10 percent

• 7 percent

Answer explanation

ACI 318

26.10.2.3 g

What is the minimum f'c of a prestressed pile ?

• 5000 ^PSI

• 2500PSI

• 1000PSI

• 4500PSI

Answer explanation

IBC

Table 1808.8.1

What is the allowable tolerance for elongation in a pre-tension member ?

• 5%

• 6 percent

• 12 percent

• 2 percent

Answer explanation

ACI 318

26.10.2 F

In unbounded construction subject to receptive loads, the possibility of fatigue of prestressed reinforcement in _______ & _______ shall be considered .

• ANCHORAGE/

  COUPLERS

• anchorage/

  wedges

• elongation/

  gauge reading

• couplers/

  elongation

Answer explanation

ACI 318

25.8.3

For prestressed concrete members classified as Class T or C in 25.5.2 and exposed to corrosive environments, the specified concrete cover shall be at least ______ that required in table 20.6.1.3.2

• 1.5 times

• 2 TIMES

• 3 TIMES

• 1 TIME

Answer explanation

ACI 318-14 20.6.1.4.2

ACI 318-19 20.5.1.4.2

What is the allowable tolerance for the elongation of a tendon in a post-tensioned deck?

• 7%

• 1.5 percent

• 2 percent

• 5 percent

Answer explanation

ACI 318

26.10.2 F

Prestressing force & friction loss shall be verified by

• MEASURING ELONGATION

  &

  MEASURING JACKING FORCE

• inspector

  and foreman

• inspector and iron worker

• engineer and inspector

Answer explanation

ACI 318

26.10.2 e 1 & 2

Prestressing reinforcement for multi-strand tendons shall not be tensioned until concrete compressive strength is at least _______

• 4000^psi

• 5000PSI

• 2500PSI

• 4500PSI

Answer explanation

ACI 318

26.10.2 g