PRESTRESSED CONCRETE DESIGN ACTUAL

PRESTRESSED CONCRETE DESIGN ACTUAL

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PRESTRESSED CONCRETE DESI GN LATEST

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The most common post-tension cable tendons in use today are made up of - ANSWER- steel strands of wire wrapped together

In an unbonded system, the force applied to the concrete after tensioning - ANSWER- comes from the anchorage zone only

Post-tension manufacturing plants must be certified by - ANSWER- PTI unbonded plant certification program

Prior to cutting the tendon tails after tensioning, the field records of stressing activities must be forwarded to and approved by - ANSWER- the engineer of record

In the event that a new set of stressing equipment is delivered to the project, the equipment should contain___ for review prior to being used on-site - ANSWER- a current calibration chart relating gauge pressure to force applied 1 / 3

According to the field procedures manual for unbonded single-strand tendons, all of the following items are necessary for post-tension document control except - ANSWER- concrete strength results

The use of a prestressed concrete system will achieve the following - ANSWER- Reduced thickness of concrete, less traditional reinforcing steel, and adequate crack control

Once tensioned, Tensioning cables are held securely in a tensioned state by - ANSWER- wedges that have been seated

The end of a cable that terminates within a concrete slab, thus rendering it inaccessible from outside the concrete is known as - ANSWER- the dead end

The presence of sheathing on a wire-stranded cable indicates that - ANSWER- it will be used in an unbonded system application

When inspecting a post-tension installation, the inspector is responsible for checking all of the following except - ANSWER- verify that the contractor has stressed the fixed-end anchorages to ensure wedges have been seated

The jacking force specified for 1/2-inch diameter tendons are normally - ANSWER- 33 kips

The inspection of a post-tension system is the responsibility of - ANSWER- The engineer of record, the special inspector, the general contractor, and a PTI-certified installer 2 / 3

What is prestressed concrete - ANSWER- The tensioning of steel-stranded cables before concrete placement.the tensioning of steel-stranded cables after concrete has been placed and hardened.Concrete that has received a tensile load prior to any service loads.

Temperature tendon profiles will - ANSWER- remain at a constant height throughout the slab

The edge form should be marked showing the center of each post-tension tendon from - ANSWER- The approved installation drawings

All of the following can affect tendon elongation field measurements except - ANSWER- the jack extends or retracts slowly

Prior to stressing tendons, the inspector should check that - ANSWER- the tendon is perpendicular to the anchor & the anchor is parallel to the face of the concrete unless the plans specify a different angle

During stressing operations, the special inspector - ANSWER- should measure the tendon elongations after each cable is stressed

The last calibration date of the stressing equipment must - ANSWER- not exceed 6 months from the stressing date

Cleaning the tendon tails prior to stressing improves - ANSWER- The consistency and permanence of the paint mark & the efforts to keep the underside of the jack clean

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