Installation Techniques & Methods Flashcards

Under the RCSC Specification, what defines the snug-tight condition of a bolted joint?

Answer: The plies are in firm contact, reached with a few impacts of an impact wrench or the full effort of an ironworker using an ordinary spud wrench

Snug-tight means the plies are in firm contact, reached with a few wrench impacts or full spud-wrench effort.

How does the turn-of-nut method pretension high-strength bolts?

Answer: By rotating the nut a specified amount past the snug-tight condition

Turn-of-nut controls tension through a specified nut rotation past snug-tight, often marked with match marks.

OSHA 1926 Subpart R requires column base connections to have at least how many anchor rods (bolts)?

Answer: Four

OSHA steel erection rules require a minimum of four anchor rods per column for stability during erection.

Metal floor and roof deck is most commonly attached to steel supporting members by which method?

Answer: Arc spot (puddle) welds or powder-actuated/screw fasteners

Steel deck is usually fastened with arc spot (puddle) welds or with mechanical fasteners such as powder-actuated pins or screws.

In multistory concrete construction, what is reshoring?

Answer: Placing shores under a slab after the original forms and shores have been removed

Reshores are placed after stripping to support young slabs and spread construction loads to the floors below.

How does a direct tension indicator (DTI) washer show adequate bolt pretension?

Answer: Its protrusions compress until the gap is reduced to a specified feeler-gage refusal

DTI protrusions flatten under bolt tension, and installers check the remaining gap with a feeler gage.

In post-tensioned concrete, when are the tendons typically stressed?

Answer: After the concrete reaches a specified minimum strength

Tendons are stressed once the concrete reaches the specified strength, often around 3,000 psi, verified by test cylinders.