Under Nevada C-14, post-tensioning of concrete is distinguished from pretensioning by which field condition?
Post Tensioning
Question · Easy
Six feet: a hard-hat anthem
Short
On an unbonded single-strand tendon, which end is the live end?
What is the usual unbonded slab tendon used in U.S. building construction under PTI practice?
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What is the primary purpose of the plastic sheathing and corrosion-inhibiting coating on an unbonded tendon?
When may unbonded slab tendons be stressed?
Theoretical tendon elongation is calculated from which relationship?
Question · Medium
Per the PTI Field Procedures Manual for unbonded single-strand tendons, measured elongation should agree with the approved theoretical value within what tolerance, unless the engineer specifies otherwise?
ACI 318 limits on prestressing steel allow a maximum jacking stress and a maximum stress immediately after seating of approximately which pair?
Why is wedge seating (wedge set) subtracted or otherwise accounted for when comparing field elongation to the theoretical value?
To what precision does PTI expect unbonded-tendon elongation to be measured in the field?
For a long unbonded tendon designated to be stressed from both ends, what is the correct field sequence?
If the plastic sheathing on an unbonded tendon is torn before the pour, what is the required repair?
When is an encapsulated unbonded PT system required instead of a standard sheathed tendon?
A 0.5-inch Grade 270 strand (A = 0.153 in², E = 28,500 ksi) is jacked to 33 kips over a 60-foot length. What is the theoretical elongation, ignoring seating?
Question · Hard
The approved theoretical elongation of a tendon is 6.00 inches. The measured elongation after seating is 5.25 inches. Using the PTI ±7 percent check, what should the crew do?
In a typical two-way unbonded PT flat plate, how are the tendons usually arranged?
After an unbonded tendon has been stressed and accepted, what is done with the stressing pocket?
What is the nominal diameter of a No. 4 reinforcing bar?
Reinforcing Steel
What is the standard unit weight of a No. 5 reinforcing bar?
Grade 60 reinforcing bar has a specified yield strength of which value?
What is the ACI/CRSI minimum concrete cover for reinforcing bars cast against and permanently exposed to earth?
Why are reinforcing bars wire-tied at intersections and laps?
What is the weight of 120 linear feet of No. 6 bar (1.502 lb/ft)?
A Class B tension lap splice is what multiple of the tension development length ld?
When two different bar sizes are lap-spliced in tension, CRSI industry practice is to use which length?
CRSI requires the lap length of bundled bars to be increased by what amounts?
For formed concrete exposed to earth or weather, what covers does ACI/CRSI require?
What is the standard ACI 90-degree hook extension, measured from the far side of the bend, for Grade 60 bars?
Which ASTM reinforcing specification is required when bars will be welded in the field?
What is the usual minimum column-tie size when the longitudinal bars are No. 10 or smaller?
Which tie is the everyday CRSI choice for holding slab and wall bars at an intersection?
A truck ticket lists 36 pieces of No. 8 bar, each 24 feet long. Using 2.670 lb/ft, what is the shipped weight?
The drawings require a Class B tension lap and list ld = 22 inches for a No. 5 Grade 60 bar. What lap should be placed?
A three-bar bundle of No. 7s has a specified single-bar Class B lap of 36 inches. What bundled lap does CRSI require?
Under OSHA 1926.760, at what height must a steel-erection employee on an unprotected edge generally be protected from falling?
Osha Subpart R
A trained connector placing steel must be protected from fall hazards of more than which height?
How many anchor rods (anchor bolts) must each column have under OSHA 1926.755?
Before the hoisting line is released from a solid-web beam, the beam must be secured with at least what connection?
A controlled decking zone may be used only in which height band, and how large may it be?
Which set of rules governs a multiple lift (Christmas-treeing) under 1926.753(e)?
Before steel erection may begin, the controlling contractor must give the erector written notice that the supporting concrete or masonry has reached which strength?
Unless constructibility prevents it, perimeter columns must extend how far above the finished floor and have cable holes at which height?
On a multi-story structure, which OSHA 1926.754(b) limit is correct unless the design maintains integrity another way?
A cover over a roof or floor opening in steel erection must meet which OSHA 1926.754(e)(3) criteria?
Who may work directly under a suspended steel load, and what extra rules apply?
When must a site-specific erection plan be developed by a qualified person and kept on the steel site?
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